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Accounting and red uction path of carbon emission firom facility agriculture in China YIN Yan, XI Feng-ming, BING Long-fei, WANG Jiao-yue, LI Jie-ying, DU Li-yu, LIU Li Chinese Journal of Applied Ecology    2021, 32 (11): 3856-3864.   DOI: 10.13287/j.1001-9332.202111.019 Abstract （1288）      PDF（pc） （2084KB）（230）       Knowledge map    Save Facility agriculture, a typical agricultural production management mode, could affect carbon cycle due to its unique production environmental conditions and highly intensive utilization. With the five main sources as accounting objects, including agricultural film investment, energy consumption, pesticide and fertilizer application, CO2 fertilizer application, and facility soil, we estimated the amount and intensity of carbon emission of three facility agriculture (continuous greenhouse, solar greenhouse, and plastic greenhouse) in 31 provinces in 2018. The results showed that the total carbon emission of facility agriculture in China was 210.3817 million t CO2e, with the three facility agriculture types of plastic greenhouse, solar greenhouse, and continuous greenhouse accounting for 60.2%, 37.4% and 2.4%, respectively. Carbon emission of facility agriculture was mainly contributed by soil greenhouse gas, agricultural film and supplies investment. Carbon emission per unit area of continuous greenhouses was significantly lower than that of solar and plastic greenhouses. The scientific capital allocation rate and facility agriculture scale were the two main factors influencing the carbon emission in facility agriculture. Based on all the results, we presented the carbon emission reduction path from the three perspectives of improving the scientific investment, material consumption utilization rate, and facility area utilization rate of facility agriculture. Reference | Related Articles | Metrics | Comments（0）

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Research progress on the cascade effect of ecosystem service. ZHANG Cheng, LI Jing, ZHOU Zi-xiang, LIU Xian-feng Chinese Journal of Applied Ecology    2021, 32 (5): 1633-1642.   DOI: 10.13287/j.1001-9332.202105.029 Abstract （1017）      PDF（pc） （1321KB）（267）       Knowledge map    Save The ecosystem services cascade (ESC), which connects the components of ecosystem services with social value and builds a bridge between natural science and social science, can help decision-makers better integrate the concept of ecosystem services into decision-making. We reviewed the concept and the research progress of ESC. From the perspective of theory, the theoretical research of ESC mainly focused on how to accurately define each component and the causal relationship among different components, improve the practicability and applicability of ESC model, and how to effectively connect stakeholders and ecosystem service structure. From the perspective of application, ESC played an important role in ecosystem services mapping, ecosystem services assessment, and policy making. There were still great uncertainties in index selection and mutual feedback mechanism. Future research should be strengthened from the following aspects: to pay more attention to the structure process and classification standard of ecosystem services, to make up the lack of ESC of the feedback mechanism through multi-model fusion and regional survey, and to provide scientific guidance for human-earth coupling and sustainable development combined with regional characteristics . Reference | Related Articles | Metrics | Comments（0）

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Quantitative stable isotope probing technique and its applications in microbial ecology ZOU Wen-xuan, SHEN Ju-pei, ZHANG Li-mei, HU Ang, WANG Jian-jun, HE Ji-zheng Chinese Journal of Applied Ecology    2021, 32 (7): 2615-2622.   DOI: 10.13287/j.1001-9332.202107.032 Abstract （953）      PDF（pc） （1235KB）（251）       Knowledge map    Save Quantitative stable isotope probing (qSIP) is a powerful tool, which links microbial taxon with functional metabolism in ecosystems and quantitatively determines the metabolic activity or growth rate of individual microbial taxa exposed to isotope tracers in the environment. qSIP technique employs quantitative PCR, high-throughput sequencing and stable isotope probing (SIP) techniques. The procedure involves adding labeled substrates to environmental samples for cultivation, separating labeled heavy fraction from unlabeled light fraction via isopycnic ultracentrifugation, making absolute quantification and sequencing analysis for microbial populations in all fractions, and then quantifying the isotope abundance of DNA involved in uptake and transformation based on the DNA density curve of unlabeled treatment and GC content. Here, we reviewed the rationale, data analysis and application of qSIP in microbial ecology, and discussed the existing problems and prospects of qSIP. Reference | Related Articles | Metrics | Comments（0）

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Convergent cross mapping method and its application in ecology WANG Dan-yu, ZHU Yuan-jun, YANG Xiao-hui Chinese Journal of Applied Ecology    2021, 32 (12): 4539-4548.   DOI: 10.13287/j.1001-9332.202112.036 Abstract （866）      PDF（pc） （1899KB）（326）       Knowledge map    Save The convergent cross mapping (CCM) is a method to analyze causality of nonlinear time series variables. Different from the traditional linear system analysis method, CCM gets historical information based on their state space reconstruction. The presence of causality can be confirmed when the estimated values perform convergent with time series extension. Here, we introduced the develop-ment history of CCM and its advantages over the traditional Granger causality test, and elaborated the principle, algorithm process, and implementation approach. As a system analysis method aiming at the coupling relationship between variables from weak to moderate, CCM can effectively solve the complex causality among nonlinear multivariable in ecosystems. When it is applied to the causality analysis of multi-point time series variables with spatial information, the spatial autocorrelation among points should be fully considered and combined with the method that can remove the spatial correlation between variables and sequences, so as to ensure more accurate causality analysis using CCM and more convincing results. Reference | Related Articles | Metrics | Comments（0）

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Effects of the removal of invasive Moso bamboo on soil microbial biomass and enzyme activities in subtropical forests WANG Ya-fang, LIU Zong-yue, ZHANG Bao-gang, YU Shu-quan, CAI Yan-jiang Chinese Journal of Applied Ecology    2022, 33 (5): 1233-1239.   DOI: 10.13287/j.1001-9332.202205.015 Abstract （825）      PDF（pc） （617KB）（101）       Knowledge map    Save Removal of invasive plant species is the first step to restoring the invaded ecosystems. The soil microbial biomass and extracellular enzyme activities were measured in Moso bamboo (Phyllostachys edulis) pure forest (completely invasion), invasive P. edulis removal forest (secondary succession 5 years after clear cutting), and the evergreen broadleaved forest (no invasion) in Tianmu Mountain. The results showed that compared with P. edulis pure forest, invasive P. edulis removal significantly increased the contents of soil organic carbon (SOC), nitrate nitrogen, available phosphorus and potassium, as well as microbial biomass carbon (MBC) and microbial biomass phosphorus (MBP), while significantly decreased microbial biomass nitrogen (MBN). The activities of α-glucosidase (AG), β-glucosidase (BG), leucine aminopeptidase (LAP) and phenol oxidase (POX) in the forest with removal of invasive P. edulis were significantly higher than those in P. edulis pure forest, while invasive P. edulis removal did not change the activities of cellodisaccharide hydrolase (CBH), β-N-acetyl-glucosaminopeptidase (NAG), acid phosphatase (ACP) and peroxidase (PER). Furthermore, the activities of AG, BG and LAP were positively correlated with SOC and MBC, while the increase in POX activity was positively correlated with soil nitrate content. In addition, MBC, MBN and MBP, and activities of AG, BG, NAG, LAP and ACP in P. edulis removal forest forest were significantly higher than those in evergreen broadleaved forests. Taken together, the removal of invasive P. edulis could increase soil nutrient contents, microbial biomass and extracellular enzyme activities, thus could be considered as an effective way to restore the invaded forests. Our results provide important theoretical basis for controlling P. edulis invasion in subtropical forests. Reference | Related Articles | Metrics | Comments（0）

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Effects of warming on radial growth of Picea crassifolia in the eastern Qilian Mountains, China LIU Lan-ya, GOU Xiao-hua, ZHANG Fen, YIN Ding-cai, WANG Xue-jia, XIA Jing-qing, LI Qian, DU Miao-miao Chinese Journal of Applied Ecology    2021, 32 (10): 3576-3584.   DOI: 10.13287/j.1001-9332.202110.019 Abstract （796）      PDF（pc） （2201KB）（59）       Knowledge map    Save Tree-rings of Picea crassifolia from high (3000 m), middle (2750 m) and low (2500 m) altitudes were collected from the Xiying River basin in the eastern Qilian Mountains, with the standard chronology being established using dendrochronological methods. Results of the correlation analysis between tree-ring width index and temperature and precipitation during different periods showed that radial growth of P. crassifolia at different altitudes responded differently to climate warming in the eastern Qilian Mountains. Water and heat availability were the main limiting factors for the radial growth of P. crassifolia in the eastern part of Qilian Mountains. The growth limiting factors at different altitudes were generally the same. Before the prominent warming (1961-1986), radial growth of P. crassifolia at the three sampling altitudes was significantly negatively correlated with mean maximum temperature in July-August of the previous year and August of the current year, and significantly positively correlated with the relative humidity in June of the current year. After the prominent warming period (1986-2014), tree growth at high, middle, and low altitudes remained significantly negatively correlated with air temperature, changed from non-significantly negative to significantly positive correlation with relative humidity in February of the current year, and changed from significantly positive to non-significantly negative correlation with precipitation and relative humidity in June. Warming caused a slowing growth of P. crassifolia tree-ring at all altitudes, with the highest altitude being the most sensitive. Drought stress caused by climate warming might be the main reason for the changes of radial growth of P. crassifolia. Reference | Related Articles | Metrics | Comments（0）

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Manipulative experiments networks on response and adaptation of terrestrial ecosystems to environmental changes: Building the research methods and technology system YU Gui-rui, NIU Shu-li, LI Fa-dong, ZHANG Lei-ming, CHEN Wei-nan Chinese Journal of Applied Ecology    2021, 32 (7): 2275-2289.   DOI: 10.13287/j.1001-9332.202107.036 Abstract （787）      PDF（pc） （5051KB）（192）       Knowledge map    Save The feedback relationship between organisms or ecosystems and environment has been a key issue in ecological research. Manipulative experiments with changing biological or environmental factors and large-scale field experiment networks were regarded as effective approaches to understand and accurately quantify the process and mechanisms underlying ecosystem response and adaptation to environmental changes. In recent years, a few networks have been developed, including large-scale networks of field physics simulation experiment (i.e., ECOTRON), ecosystem analysis and experiment platform (AnaEE), international Drought Network, Nutrient Network, and experiment networks based on regional ecological observation stations (i.e., USA-ILTER) at global scale. The development of continent-scale experiment network platform is attracting more attention from the academic community, and will play a more important role in understanding the process and mechanism underlying ecosystem responses to environmental change. We reviewed the development of method and experiment system of ecosystem manipulative experiments, and clearly pointed out that different experiments should form a joint collaborative system to answer fundamental scientific questions about the response and adaptation of ecosystem to global environment change. Manipulative experiments could be classified into four types: 1) Physiological and ecological experiments in closed laboratory equipment; 2) semi-open experiments with changing environmental factors in the field; 3) near-natural field experiments; 4) experiment networks based on field ecological station. Furthermore, we discussed the trends in network design of manipulative experiments focusing on ecosystem response and adaptation to environmental changes and the advantages of large-scale experiments based on natural environmental gradients. We put forward a proposal of integrating the technical advantages of different types of experiments and developing a new generation of field experiment network system. The study discussed the research system based on field experiment network, demonstrated the possibility to understand the patterns and mechanisms of the ecosystem short-term response and long-term adaptation to environmental changes, and proposed some equations to quantify the environmental response of ecosystems. The application of the design plan of the manipulative experiments network proposed here will greatly promote the scientific research level of ecosystems and environmental changes in China and even over the whole world, which has important scientific significance for the national response to climate change and ecological environmental construction. Reference | Related Articles | Metrics | Comments（0）

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Research progress on mechanism of arbuscular common mycorrhizal networks in plant-plant interactions CAO Ben-fu, JIANG Hai-xia, LIU Li, LU Yin-gang, WANG Mao-sheng Chinese Journal of Applied Ecology    2021, 32 (9): 3385-3396.   DOI: 10.13287/j.1001-9332.202111.032 Abstract （781）      PDF（pc） （871KB）（88）       Knowledge map    Save Plant-plant interactions is one of the key field in ecology, which is important for the efficient nutrient utilization, productivity improvement, and plant community assembly. Arbuscular mycorrhizal fungi are important plant mutualistic microorganisms that connect plant roots to form common mycelial networks (CMNs), which play major roles in transferring nutrients and water and regu-lating plant community dynamics. Recent studies demonstrated that these CMNs could act as conduits for transmitting disease and aphid-induced signals among plants, and activating chemical defence in uninfested neighboring plants. In this review, we introduced recent research advances on the contribution of CMNs on plant interaction, the main factors that influences the functions of CMNs, and the role of CMNs transfer and redistribute nutrients and water among plant. In addition, the mechanism underlying underground chemical signal communication, seedling establishment and plants community assembly were summarized. Finally, we proposed challenges facing CMNs in plant-plant interactions and the practical problems. It would provide reference for further understanding the ecological functions of CMNs in plant-plant interactions. Reference | Related Articles | Metrics | Comments（0）

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Wetland ecosystem service function and its value accounting:A case study of Fuzhou City, China WANG Jiao-yue, BING Long-fei, YIN Yan, XI Feng-ming, MA Ming-jing, ZHANG Wen-feng Chinese Journal of Applied Ecology    2021, 32 (11): 3824-3834.   DOI: 10.13287/j.1001-9332.202111.017 Abstract （697）      PDF（pc） （1538KB）（127）       Knowledge map    Save Wetland plays an important role in ecological protection and social development. Scientific and rational evaluation of the values of wetland ecosystem service is the basis of protection and sustainable utilization of wetland resources. How to scientifically and effectively assess the wetland ecosystem gross ecosystem product (GEP) and make it into the national GDP accounting system are the focus of the scientific community and government departments. In this study, the accounting framework of wetland ecosystem GEP was constructed. Based on multi-source data and from the aspects of function and value, the accounting of wetland GEP in Fuzhou City was carried out. The results showed that the GEP of wetland ecosystem in Fuzhou City was 239.23 billion yuan in 2015. Such value mainly came from the ecological regulation service value (157.869 billion yuan), which accounted for 66.0% of the total and was about 2.2 and 15.6 times of the product supply service value and cultural service value. Among the ecological regulation services of wetlands, hydrodynamic regulation service and climate regulation service were the highest. Together, they accounted for 82.9% of the ecological regulation service value. The ecological regulation value per unit area of wetland in Fuzhou City was 1347.8 thousand yuan·hm-2, which was higher than the mean level of the whole country. In the districts and counties of Fuzhou City, the value of wetland ecosystem in Minqing County was the largest, about 88.83 billion yuan, accounting for 40.1% of the total value of product supply and ecological regulation. In terms of types, coastal wetlands in Fuzhou City had the largest function of ecological regulation services, which was about 2.5 times of that of river wetlands and constructed wetlands. The accounting of GEP of wetland ecosystem in Fuzhou City is an important practice for the conviction of “lucid waters and lush mountains are invaluable assets”, which would provide technical support for guiding local government to scientifically manage wetland ecosystem. Reference | Related Articles | Metrics | Comments（0）

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Effects of plant residues on C:N:P of soil, microbial biomass, and extracellular enzyme in an alpine mea-dow on the Qinghai-Tibetan Plateau, China XIAO Xiang-qian, ZHANG Hai-kuo, FENG Ya-si, WANG Ji-peng, LIANG Chen-fei, CHEN You-chao, ZHU Gao-di, CAI Yan-jiang Chinese Journal of Applied Ecology    2023, 34 (1): 58-66.   DOI: 10.13287/j.1001-9332.202301.008 Abstract （689）      PDF（pc） （1147KB）（90）       Knowledge map    Save Plant residues can affect C:N:P of soil, microbial biomass, and extracellular enzyme, but the effects are still unclear. We conducted a field experiment in an alpine meadow on the eastern part of the Qinghai-Tibetan Plateau to explore the effects of removing aboveground plant or roots and adding plant residues on the C:N:P of soil, microbial biomass, and extracellular enzyme. The results showed that removing aboveground plant biomass significantly decreased soil C:N (the change was -23.7%, the same below) and C:P (-14.7%), microbial biomass C:P and N:P, while significantly increased microbial biomass C:N, and enzyme C:N:P compared with meadow without human disturbance. Removing all plant biomass (aboveground and roots) significantly reduced soil C:N (-11.6%), C:P (-24.0%), N:P (-23.3%) and microbial biomass C:N in comparison to removing aboveground plant, while significantly improved microbial biomass N:P and enzyme N:P. Adding plant residues after removing aboveground plant significantly increased microbial biomass C:N and C:P, enzyme C:N compared with removing aboveground plant, while significantly decreased enzyme N:P. Compared with removing all the plant, adding plant residues after removing whole plant significantly reduced soil C:N (-16.4%), microbial biomass C:P, N:P and enzyme N:P, while significantly increased enzyme C:N. Our results suggest that removal of plants could have a strong effect on C:N:P of soil, microbial biomass, and extracellular enzyme, and C:N:P of microbial biomass and that extracellular enzyme woule be more sensitive to plant residues. Roots could play a key role in stabilizing C:N:P of soil, microbial biomass, and extracellular enzyme under plant residues addition. Adding plant residues could be a suitable solution for restoring alpine meadows under the circumstance of intact roots, which was conducive to soil C storage, but might not be suitable for alpine meadows with serious root damage, which would increase soil CO2 emission. Reference | Related Articles | Metrics | Comments（0）

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Review on supply and demand of ecosystem service and the construction of systematic framework YI Dan, XIAO Shan-cai, HAN Yi, OU Ming-hao Chinese Journal of Applied Ecology    2021, 32 (11): 3942-3952.   DOI: 10.13287/j.1001-9332.202111.011 Abstract （660）      PDF（pc） （1695KB）（182）       Knowledge map    Save The supply and demand of ecosystem services are related to both natural ecosystems and socio-economic systems. The research on the supply and demand of ecosystem services would help enhance ecosystem management and achieve optimal allocation of resources, which ensures regional ecological security and sustainable development of socio-economic. Based on a systematic review of international literature, we comprehensively reviewed the conceptual connotation, evaluation metho-ds, and practical application of ecosystem service supply and demand. Although relatively abundant investigations have been conducted from the perspective of theoretical development, they are still scattered and lacking a coherent research framework. Based on expanding the scope of research on the supply and demand of ecosystem service, we constructued a research framework that referred to “qualitative-positioning-quantitative-policymaking” in accordance with the research pattern of “theory-methodology-practice”. To promote the theoretical and practical research on the supply and demand of ecosystem service, future research needs to focus on the spatial delivery mechanism, strengthen the research on quantitative methods, deepen the management and application practice, and establish the evaluation mechanism of ecosystem service supply and demand application. Reference | Related Articles | Metrics | Comments（0）

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Soil physical and chemical properties and vegetation characteristics of different types of grassland in Qilian Mountains, China YANG Xue-ting, FAN Jun, GE Jia-min, DU Meng-ge, JIN Mu Chinese Journal of Applied Ecology    2022, 33 (4): 878-886.   DOI: 10.13287/j.1001-9332.202204.019 Abstract （620）      PDF（pc） （3185KB）（147）       Knowledge map    Save Grasslands in Qilian Mountains plays an important role in maintaining the ecological security of western China. To understand soil physical and chemical properties and the distribution characteristics of vegetation, as well as their correlation in different types of grasslands in Qilian Mountains, we measured soil moisture, nutrient content, bulk density, particle composition, and vegetation characteristics in seven types of grassland in Qilian Mountains. The fractal dimension of soil particles, soil organic carbon, total nitrogen and total phosphorus storages in 0-40 cm soil layer, and plant diversity index were calculated. The results showed that there were significant differences in soil physical and chemical properties and vegetation characteristics among different grassland types. Compared with other types of grassland, alpine meadow had higher soil water, nutrient and clay content, but lower bulk density and sand content. Soil organic carbon, total nitrogen and total phosphorus storages in 0-40 cm layer ranged from 3084 to 45247, 164 to 2358 and 100 to 319 g·m-2, respectively, with high contents of organic carbon and total nitrogen and low content of total phosphorus. There was a significant positive correlation between soil total phosphorus storage and plant diversity index, indicating that soil total phosphorus content was the key factor affec-ting grassland plant diversity in Qilian Mountains. Compared with other grassland types, alpine meadow in Qilian Mountains had better vegetation status, soil moisture, and nutrient conditions. Reference | Related Articles | Metrics | Comments（0）

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Landscape ecological risk assessment and influencing factors in ecological conservation area in Sichuan-Yunnan provinces, China. GAO Bin-pin, LI Chen, WU Ying-mei, ZHENG Ke-jun, WU Yan Chinese Journal of Applied Ecology    2021, 32 (5): 1603-1613.   DOI: 10.13287/j.1001-9332.202105.018 Abstract （616）      PDF（pc） （3861KB）（181）       Knowledge map    Save It is important for preventing and resolving landscape ecology risk and promoting regional sustainable development to explore the characteristics of temporal and spatial variations of landscape ecology risk of key ecological function zone and to reveal the potential influence of human activity on aggravation of landscape ecological risk. Based on the land cover data of 2000, 2010, and 2020, we constructed a model of risk assessment on landscape ecology, incorporating a landscape index and an assessment of ecological vulnerability, with the support of ArcGIS 10.8 and Fragstats 4.2. The spatial analysis method was used to examine the temporal and spatial variations of landscape ecology risk in ecological conservation in Sichuan-Yunnan provinces. We used the Geodetector to quantify the impacts of natural and social-economy factors in different ranges of region on landscape ecological risk. The results showed that from 2000 to 2020, the area of artificial land surface, water body, shrubland in the study area showed an upward trend, while the area of forest, cultivated land, grassland, wetlands, barren land, and permanent snow cover and glacier showed an downward trend. There was remarkable transfer of landscape types among forest, grassland and cultivated land, especially for the transfer from cultivated land to artificial surface. The mean value of landscape ecological risk had been reducing. The classes of landscape ecological risk was consistent with the changes and shifts of landscape. Landscape ecological risk was mainly at lower, low, and high levels in ecological conservation in Sichuan-Yunnan provinces. Natural factors, including elevation and precipitation, generally drove the temporal-spatial variations of landscape ecological risk. In addition, factors such as economy, society and regional accessibility could contribute to prominent impacts on local area suffering from pejorative risk. Reference | Related Articles | Metrics | Comments（0）

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Discussion on the ecological theory and assessment methods of ecosystem quality and its evolution YU Gui-rui, WANG Yong-sheng, YANG Meng Chinese Journal of Applied Ecology    2022, 33 (4): 865-877.   DOI: 10.13287/j.1001-9332.202204.026 Abstract （591）      PDF（pc） （2234KB）（166）       Knowledge map    Save Ecological civilization construction and ecological environment governance are basic tasks of state gover-nance in China. China has clearly put forward the goal of improving ecosystem quality and stability. However, there are no consensus on the scientific concept of ecosystem quality and the assessment methods of ecosystem quality evolution, which has puzzled the academic community. Based on the summarization of the scientific concept of ecosystem quality and its evolution, we discussed the concept of ecosystem quality and its ecological theory basis by referencing the concept of production quality, quality management and quality assessment of material production. The scientific connotation of ecosystem quality and its evolution was discussed from the perspectives of ecosystem natural attribute-social attribute-economic attribute and the relationships between them, the cascade relations of ecosystem component-structure-process-function-service-efficacy, the feedback of factor-system-environment, and the logic relation of state ecosystem fluctuation-quantity variation-quality alternation. We proposed perspectives and approaches of multi-objective assessment of ecosystem quality alternation from the aspects of natural resource environment system, typical ecosystem, regional macro-ecosystem, and ecological engineering efficacy. Reference | Related Articles | Metrics | Comments（0）

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Pattern evolution and impact factor of Jiuduansha Wetland at the Yangtze Estuary during 1989-2020 SHI Yu-xiao, LI Yang, MENG Yi, ZHAO Zhi-yuan, ZHANG Ting-yu, WANG Dong, YUAN Lin Chinese Journal of Applied Ecology    2022, 33 (8): 2229-2236.   DOI: 10.13287/j.1001-9332.202208.022 Abstract （583）      PDF（pc） （2933KB）（159）       Knowledge map    Save Affected by the changes of drainage basin and marine environment and human activities, estuarine wetland is fragile, sensitive, and complex in evolution. Jiuduansha Wetland is the largest estuarine shoal wetland in the Yangtze Estuary, and is undergoing rapid changes due to the reduction of sediment inputs and the invasion of alien species Spartina alterniflora. In this study, the changes of Jiuduansha Wetland from 1989 to 2020 were analyzed through remote sensing interpretation, field investigation, and topographic data analysis. The impacts of watershed sediment reduction and S. alterniflora invasion on Jiuduansha Wetland were analyzed based on the hydrological data of Datong station and the invasion history of S. alterniflora. The results showed that the total area of Jiuduansha Wetland (above -5 m) first increased and then decreased since 1991, reaching its maximum in 2005 (421.16 km2). The area of tidal flat wetland (above 0 m) and wetland vegetation increased continuously from 1989 to 2020, with 1.5 times and 47.1 times increases, respectively. The decreases of sediment supply led to a decrease in the total area of Jiuduansha Wetland (above -5 m) and a decrease growth rate of tidal flat wetland area above 0 m and vege-tation area. The invasive species S. alterniflora had expanded rapidly, occupied the space of native species, and became the dominant species in Jiuduansha Wetland since it was introduced in 1997. Sediment reduction and S. alterniflora invasion had led to the rapid changes of Jiuduansha Wetland structure. In order to avoid the degradation of ecological service, wetland protection and restoration should be taken to maintain the stability and health of Jiu-duansha Wetland. Reference | Related Articles | Metrics | Comments（0）

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Black microplastics in the environment: Origin, transport and risk of tire wear particles CHEN Yao, LIU Jin, ZHANG Ying-xin, LI Jia-yang, LI Gui-ju Chinese Journal of Applied Ecology    2022, 33 (8): 2260-2270.   DOI: 10.13287/j.1001-9332.202208.028 Abstract （573）      PDF（pc） （2297KB）（167）       Knowledge map    Save With the continuous growth of vehicle per capita in recent years, tire wear particles (TWP) produced by tire wear on roads have been widely found in various environmental media, whose environmental behavior and effects have attracted extensive attention. After being produced, these microsized and nanosized TWP will drift into the atmosphere or enter the surrounding soil, rivers, and even into the ocean with rain and runoff. The existence of TWP significantly affects the composition of organic materials in the environment. Meanwhile, the release of heavy metals and organic additives from TWP will be harmful to organisms and human health. We summarized the sources and characteristics of TWP, their migration and diffusion in water, atmosphere, and soil environment. By analyzing the environmental impacts and ecological risks of TWP pollution, we proposed the key questions urgently to be solved and prevention measures. Reference | Related Articles | Metrics | Comments（0）

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Species richness and endemism pattern of Fagaceae in Southwest China and their environmental interpretation ZHANG Feng-ying, LIAO Zi-yan, PAN Kai-wen, ZHANG Meng, ZHAO Yu-lin, ZHANG Lin Chinese Journal of Applied Ecology    2021, 32 (7): 2290-2300.   DOI: 10.13287/j.1001-9332.202107.012 Abstract （572）      PDF（pc） （3508KB）（55）       Knowledge map    Save How to accurately model species macro-richness patterns and endemism centers is a key focus of biodiversity conservation efforts and a hot biogeographical topic. Southwest China is one of regions with high Fagaceae species richness, the species diversity patterns and driving mechanisms are unclear. In this study, the distribution pattern of species richness (SR), weighted endemism (WE), and corrected weighted endemism (CWE) indices were estimated based on 7258 occurrence points of 161 Fagaceae species in Southwest China using both occurrence-to grid method and species distribution model (SDM). We used the spatial autoregressive (SAR) model to analyze the relationship between diversity indices and environmental factors. Overall, the three SDM-simulated diversity indices were more continuous in values than that of the occurrence-to grid method, though the distributions of those indices obtained by the two methods were similar. The areas with high SR value were mainly distributed in the south edge of Yunnan, north Guangxi and southwest Guangxi (62-89 species). The maximum of WE concentrated in south Yunnan and west Guangxi (1.77-5.02). The highest CWE (0.07-0.17) was found in southeast Tibet, Qinling-Daba Mountains, southwest Guangxi, and southeast Yunnan. The SAR models showed significant effect of precipita-tion in the driest month, standard deviations of seasonal temperature, altitude range and soil organic carbon content on SR. The effects of precipitation in the driest month, standard deviations of seaso-nal temperature, potential evaporation and altitude range on the WE were significant. The precipitation in the driest month, standard deviations of seasonal temperature, historical temperature change, coefficient of variation of enhanced vegetation index and altitude variation had significant effects on the CWE. The R2 of SAR model for SR, WE and CWE was 0.857, 0.733, 0.593, respectively, being higher than that of ordinary least squares (OLS) (R2=0.689, 0.425, 0.422). In conclusion, water availability, climate seasonality, habitat heterogeneity, historical climate change and soil condition were the most important factors limiting the distribution of SR and WE of Fagaceae in Southwest China. The SR and WE centers of Fagaceae were located in south and southeast Yunnan, southwest Guangxi, west Guangxi, Qinling-Daba Mountains, and southeast Tibet, where should be adequately protected. Reference | Related Articles | Metrics | Comments（0）

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Population structure and dynamics of Pinus koraiensis seedlings regenerated from seeds in a montane region of eastern Liaoning Province, China. ZHANG Xiao-peng, YU Li-zhong, YANG Xiao-yan, HUANG Jia-qi, YIN You Chinese Journal of Applied Ecology    2022, 33 (2): 289-296.   DOI: 10.13287/j.1001-9332.202202.001 Abstract （565）      PDF（pc） （1616KB）（92）       Knowledge map    Save Based on the static life table and survival curve, we explored the population structure and dynamics of Korean pine (Pinus koraiensis) seedlings regenerated from seeds in three different forest belts of Korean pine plantation in a montane region of eastern Liaoning Province. The results showed that the age structure of Korean pine seedlings in three different forest belts (i.e., larch forest belt, mixed coniferous forest belt, and mixed broadleaved forest belt) showed a “∩” type of left skewed distribution. The abundance of seedlings was rich but the mortality rate was high in the early phase, and the abundance of seedlings decreased in the later phase, which indicated that the population was depressing. The survival curve of the population conformed to the Deevey-Ⅱ type. The life expectancy of Korean pine seedlings at each age class in larch forest belt was higher than that in mixed coniferous forest belt and mixed broadleaved forest belt. The survival analysis showed that the survival rate of Korean pine seedlings in three different forest belts decreased but the cumulative mortality rate increased with increasing age. The death density function tended to be flat after the age class of Ⅱ-Ⅲ, while the risk function value showed a decreasing trend with the increases of age. The time series predictive analysis showed that the population showed a certain growth trend with increasing age class, indicating that the population could achieve natural regeneration and have a certain growth potential, but with regeneration obstacles. Reference | Related Articles | Metrics | Comments（0）

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Urbanization and ecological effect in mid-southern Liaoning urban agglomeration, China ZHANG Dan-hua, WANG Yang, YAO Ning Chinese Journal of Applied Ecology    2022, 33 (9): 2521-2529.   DOI: 10.13287/j.1001-9332.202209.025 Abstract （557）      PDF（pc） （6898KB）（51）       Knowledge map    Save China has entered the stage of rapid urbanization since the 1990s, resulting in a series of environmental problems. Based on the nighttime light remote sensing data and land use data from 1995 to 2020, we extracted the compound night light index (CNLI) to measure the urbanization level of mid-southern Liaoning urban agglomeration, evaluated habitat quality by InVEST model. We examined the relationship between urbanization level and habitat quality in mid-southern Liaoning urban agglomeration by using the correlation analysis method and the geographic weighted regression model. The results showed that CNLI increased by 0.14 from 1995 to 2020. The urbanization level increased continuously, with a pattern of “low in the east and high in the west”. The habitat quality decreased by 0.005, showing a pattern of “high in the east and low in the west”. The ecological environment became worse. There was a significant negative spatial correlation between urbanization level and habitat quality in mid-southern Liaoning urban agglomeration. The negative impact of urbanization level on habitat quality gradually decreased. In order to alleviate habitat degradation caused by urbanization and realize the coordinated and sustainable development of regional social economy, it was urgent to take a series of measures, such as delimiting the ecological protection red line, improving the intensive use of land, delimiting the urban boundary, promoting the coordinated development of regional integration. Reference | Related Articles | Metrics | Comments（0）

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C, N, and P stoichiometry for leaf litter of 62 woody species in a subtropical evergreen broadleaved forest LI Aogui, CAI Shifeng, LUO Suzhen, WANG Xiaohong, CAO Lirong, WANG Xue, LIN Chengfang, CHEN Guangshui Chinese Journal of Applied Ecology    2023, 34 (5): 1153-1160.   DOI: 10.13287/j.1001-9332.202305.005 Abstract （528）      PDF（pc） （2137KB）（693）       Knowledge map    Save To understand leaf litter stoichiometry in a subtropical evergreen broadleaved forest, we measured the contents of carbon (C), nitrogen (N) and phosphorus (P) in leaf litters of 62 main woody species in a natural forest of C. kawakamii Nature Reserve in Sanming, Fujian Province. Differences in leaf litter stoichiometry were analyzed across leaf forms (evergreen, deciduous), life forms (tree, semi-tree or shrub), and main families. Additionally, the phylogenetic signal was measured by Blomberg's K to explore the correlation between family level differentiation time and litter stoichiometry. Our results showed that the contents of C, N and P in the litter of 62 woody species were 405.97-512.16, 4.45-27.11, and 0.21-2.53 g·kg-1, respectively. C/N, C/P and N/P were 18.6-106.2, 195.9-2146.8, and 3.5-68.9, respectively. Leaf litter P content of evergreen tree species was significantly lower than that of deciduous tree species, and C/P and N/P of evergreen tree species were significantly higher than those of deciduous tree species. There was no significant difference in C, N content and C/N between the two leaf forms. There was no significant difference in litter stoichiometry among trees, semi-trees and shrubs. Effects of phylogeny on C, N content and C/N in leaf litter was significant, but not on P content, C/P and N/P. Family differentiation time was negatively correlated with leaf litter N content, and positively correlated with C/N. Leaf litter of Fagaceae had high C and N contents, C/P and N/P, and low P content and C/N, with an opposite trend for Sapidaceae. Our findings indicated that litter in subtropical forest had high C, N content and N/P, but low P content, C/N, and C/P, compared with the global scale average value. Litter of tree species in older sequence of evolutionary development had lower N content but higher C/N. There was no difference of leaf litter stoichiometry among life forms. There were significant differences in P content, C/P, and N/P between different leaf forms, with a characteristic of convergence. Reference | Related Articles | Metrics | Comments（0）