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Effects of Pb and Ni stress on antioxidant enzyme system of Thuidium cymbifolium. SUN Shou-qin1;HE Ming2;CAO Tong3;CHENG Song1;SONG Hong-tao1 Chinese Journal of Applied Ecology    Abstract （2336）      PDF（pc） （711KB）（8967）       Knowledge map    Save This paper studied the accumulation and scavenging of active oxygen radicals, injury of photosynthetic system and membrane system, and changes of antioxidant enzyme system in Thuidium cymbifolium cells under single and combined stress of Pb and Ni. Under low concentration of Pb and Ni (Pb<01 mmol·L-1，Ni<001 mmol·L-1), the chlorophyll content of T. cymbifolium increased; while under high concentration of Pb and Ni (Pb>01 mmol·L-1, Ni>001 mmol·L-1), it was in adverse. There was a dose-dependent accumulation of reactive oxide species (ROS) and malondialdehyde (MDA) under combined Pb and Ni stress. The superoxide dismutase (SOD) and catalase (CAT) activities decreased while the peroxidase (POD) activity increased with increasing Pb and Ni concentration, indicating the important role of POD in eliminating ROS under Pb and Ni stress. The dose-dependent change of MDA content and CAT activity under Pb and Ni stress suggested that T. cymbifolium could be used as a biomarker in pollution monitoring of these two heavy metals. Related Articles | Metrics | Comments（0）

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Biological characteristics of heat shock transcription factors and their roles in abiotic stress adaptation of higher plant SHAO Kun-zhong, LYU Xin-pei, LI Jia-lyu, CHEN Jia, ZHAO Ling-yu, REN Wei, ZHANG Jin-lin Chinese Journal of Applied Ecology    2022, 33 (8): 2286-2296.   DOI: 10.13287/i.1001-9332.202208.039 Abstract （505）      PDF（pc） （1140KB）（8123）       Knowledge map    Save Heat shock transcription factors (HSFs) are involved in the regulation of plant growth and development. Furthermore, HSFs regulate the expression of a series of genes related to various abiotic stress adaptations. HSFs usually form homotrimers to activate their transcriptional activity and function. Here, we review the basic structure, subcellular localization, transcriptional regulation, functional diversity of HSFs, and their roles in plant adaptation to abiotic stresses, such as extreme temperature, salinity, drought, strong light and oxidative stress, etc. HSFs are high-quality candidate genes for improving the resistance of higher plants to multiple stresses. Studies of HSFs have important application value. In the future, using HSFs to improve the resistance of various crops through genetic engineering would be prospects of development. Reference | Related Articles | Metrics | Comments（0）

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Application of ecoacoustic monitoring in the field of biodiversity science BIAN Qi, WANG Cheng, HAO Ze-zhou Chinese Journal of Applied Ecology    2021, 32 (3): 1119-1128.   DOI: 10.13287/j.1001-9332.202103.032 Abstract （624）      PDF（pc） （1110KB）（5934）       Knowledge map    Save Sound is an important way of communication among organisms. The monitoring and analy-sis of biological sound is an emerging method to describe and evaluate biodiversity. This method does not invade or damage the natural environment. By recording ecological information through sound, it can effectively reflect the relevant characteristics of biodiversity. The sound-based exploration of biodiversity change has broadened the interdisciplinary approach and has been increasingly applied to ecological research. Here, we expounded on the main theoretical foundations and research methods of using acoustic monitoring to assess biodiversity. We introduced related research fields from two aspects, namely the biodiversity of vocal animals and the temporal and spatial diversity of soundscape. We presented examples of the application of acoustic monitoring to assess the impact of land-use change, climate change and urbanization on biodiversity. Finally, we proposed the future direction of development, and hope that the potential of sound surveys could be further explored to provide an effective reference for biodiversity monitoring and assessment. Reference | Related Articles | Metrics | Comments（0）

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Physiological metabolism and protective enzyme activity of Equisetum ramosissimum under Cu stress LI Ying;LIU Dengyi Chinese Journal of Applied Ecology    Abstract （3408）      PDF（pc） （407KB）（5382）       Knowledge map    Save The study with pot culture experiment showed that Equisetum ramosissimum did not appear obvious poisoning symptoms when treated with low concentration Cu (500 mg·kg-1),while serious injuries were found when treated with high concentration Cu (1 000～3 000 mg·kg-1),which reflected in the severe damage of cell membrane and cytoarchitecture as well as the structure and function of main organelles,and the significant decrease of the contents of leaf chlorophyll a and b and stem soluble monosaccharose.The cell membrane osmolarity and the average MDA content of the plant exposed to heavy copper pollution was 1～2 and 1～3 times greater than the control,respectively.It could be concluded that high concentration Cu disturbed the physiological metabolism,and critically threatened the normal growth of E.ramosissimum.The activities of protective enzyme,especially of SOD and POD,were enhanced with increasing Cu concentration,and had a positive correlation with Cu concentration (rPOD=0.978,rSOD=0.926,P<0.05). Related Articles | Metrics | Comments（0）

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Changes of soil bacterial community structure at the secondary successional stages in the Pinus yunnanensis forest XU Fan-di, LI Shuai-feng, SU Jian-rong Chinese Journal of Applied Ecology    2021, 32 (3): 887-894.   DOI: 10.13287/j.1001-9332.202103.039 Abstract （514）      PDF（pc） （876KB）（5364）       Knowledge map    Save Soil bacterial diversity is a key factor for the maintanence of forest ecosystem function. Soil bacterial community would change along forest succession. We analyzed the variations of soil bacterial diversity and community composition at different successional stages in the Pinus yunnanensis forest, which would help understand the mechanism underlying forest restoration. We investigated soil bacterial diversity, community composition, and effect factors at different successional stages (including coniferous forest, mixed coniferous and broadleaf forest, and evergreen broadleaf forest) using Illumina Hiseq platform. The results showed that OTUs, Chao1 index, Ace index, and Shannon index of soil bacterial community decreased with the process of secondary succession. The highest soil bacterial total OTUs, richness, and complexity appeared at early successional stage. Soil bacterial community composition varied across different stages, with the mixed coniferous and broadleaf forest showing largest variation. Proteobacteria and Acidobacteria were common dominant phyla at secondary successional stages. Actinobacteria, Chloroflexi, and Patescibacteria were dominant phyla at the early successional stage, the abundance of which decreased with successional process in the P. yunnanensis forest. Proteobacteria and WPS-2 increased with the succession. Soil pH and tree species richness were key factors in driving soil bacterial community structure. The soil bacterial diversity decreased with forest succession, while the variations of soil bacterial community composition became larger. Reference | Related Articles | Metrics | Comments（0）

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Distribution patterns of Fraxinus mandshurica root biomass,specific root length and root length density MEI Li1;WANG Zhengquan1;HAN Youzhi1,2;GU Jiacun1;WANG Xiangrong1;CHENG Yunhuan1;ZHANG Xiujuan1 Chinese Journal of Applied Ecology    Abstract （3963）      PDF（pc） （388KB）（4854）       Knowledge map    Save Employing soil core method,an investigation in Maoershan Experiment Station was made on the root biomass,specific root length (SRL),and root length density (RLD) of Fraxinus mandshurica plantation (17 yr) within a growth season in stand level.The results showed that the total root biomass was 1 637 g·m-2,in which,living biomass accounted for 85%,and necrotic biomass was 15%.In the living biomass,coarse roots (5～30 mm in diameter) had the highest percentage (69.95%),followed by fine roots (<1 mm in diameter) (13.53%),medium roots (2～5 mm in diameter) (7.21%),and small roots (1～2 mm in diameter) (9.31%).Among the four diameter classes,fine roots had a higher SRL (32.20 m·g-1),while coarse roots had a lower one (0.08 m·g-1).The total RLD in living biomass was 6 602.54 m·m-2 in stand level,among which,fine root accounted for 92.43%,and the others was less than 8%.Fine root biomass and RLD had a positive correlation with soil available nitrogen,while no significant correlation was found between SRL and soil available nitrogen. Related Articles | Metrics | Comments（0）

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Distribution pattern and dynamics of Alnus nepalensis and Litsea glutinosa populations in Nomascus concolor habitat TIAN Changcheng1,2;ZHOU Shoubiao1;JIANG Xuelong2 Chinese Journal of Applied Ecology    Abstract （3019）      PDF（pc） （425KB）（4208）       Knowledge map    Save Alnus nepalensis and Litsea glutinosa are the two common trees in the habitats of black-crested gibbons (Nomascus concolor) in Wuliang Mountain of Yunnan Province.With the nearest neighbor method and Heygi’scompetition index model for individual tree,this paper analyzed the distribution patterns of the two populations and their competition.The results showed that A.nepalensis had a random distribution at its different growth phases,while L.glutinosa,the companion species of A.nepalensis,exhibited the trend of random distribution-clumped distribution-regular distribution.Interspecific competition and biological characters had significant effects on the distribution patterns of A.nepalensis and L.glutinosa.Regression age structure was observed in A.nepalensis population,while increasing age structure presented in L.glutinosa population. Related Articles | Metrics | Comments（0）

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Vegetation coverage change of the demonstration area of ecologically friendly development in the Yangtze River Delta, China based on GEE and BRT during 1984-2019 LIU Yao-yi, ZENG Peng, ZHANG Ran, SUN Feng-yun, CHE Yue Chinese Journal of Applied Ecology    2021, 32 (3): 1033-1044.   DOI: 10.13287/j.1001-9332.202103.011 Abstract （724）      PDF（pc） （6841KB）（4053）       Knowledge map    Save The demonstration area of ecologically friendly development in the Yangtze River Delta is a major national strategy area, and thus eco-environmental protection should be a priority for the sustainable development. Exploring the spatial-temporal variations of franctional vegetation coverage (FVC) is conducive to accurate assessing the ecological quality of environment, which is of great significance to regional sustainable development. In this study, the characteristics and trends of spatial-temporal variation of vegetation cover during 1984-2019 in the demonstration area were analyzed based on Google Earth Engine (GEE). The effects of different ecological factors on FVC were quantified by the boosted regression tree (BRT). Results showed that,the changing trend of FVC in the study area shifted from decreasing to increasing trend from 1984 to 2019. The spatial distribution of FVC in the study area varied with both stages and regions. FVC was mainly degraded. Compared with the year 1984, the area of vegetation degradation and improvement in 2019 accounted for 49.8% and 12.8%, respectively. The vegetation degradation mainly occurred in the north of Wujiang, south of Jiashan, and northeast of Qingpu. Human activities severely weakened the influence of natural factors on FVC. Our findings suggested that the GEE is an effective tool for monitoring the dynamics of vegetation coverage. Reference | Related Articles | Metrics | Comments（0）

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Spatial-temporal variations of carbon storage and carbon sequestration rate in China’s national forest parks LI Wei, HUANG Mei, ZHANG Yuan-dong, GU Feng-xue, GONG He, GUO Rui, ZHONG Xiu-li, YAN Chang-rong Chinese Journal of Applied Ecology    2021, 32 (3): 799-809.   DOI: 10.13287/j.1001-9332.202103.015 Abstract （1220）      PDF（pc） （2251KB）（3546）       Knowledge map    Save Forests play an important role in regulating climate change and maintaining carbon balance. To explore the carbon storage and carbon sequestration rate of national forest parks is of great significance for carbon sequestration capacity assessment and sustainable forest management. A process-based ecosystem model (CEVSA2 model) was used to simulate the spatial distribution of carbon density, carbon storage and carbon sequestration rate of 881 national forest parks in China during 1982-2017. The results showed that the average carbon density of national forest parks was 255.18 t C·hm-2, being higher than the average carbon density of forest ecosystem in China. In 2017, the total carbon storage of national forest parks increased to 3.56 Pg C, accounting for 11.0%-12.2% of the total carbon storage in national forest ecosystems. During 1982-2017, the average carbon sequestration rate of national forest parks reached 0.45 t C·hm-2·a-1, and the carbon sequestration rate of all national forest parks was above 0.30 t C·hm-2·a-1. National forest parks in the northeast and southwest of China had the highest total carbon storage. The national forest parks in northeast of China had the highest soil organic carbon sequestration rate, while those in eastern China and central southern China had the highest biomass carbon sequestration rate. The area of national forest parks accounted for 5.8% of the total forest area of China, playing an important role in forest carbon sink management of China. Accurate assessment of the growth status, carbon sequestration potential and carbon absorption characteristics of national forest parks could provide reference for the comprehensive assessment of ecosystem service of forest parks in China. Reference | Related Articles | Metrics | Comments（0）

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Form transformation of arsenic in soil and corresponding analyzing methods. HE Qiu-hong; ZENG Xi-bai Chinese Journal of Applied Ecology    Abstract （2745）      PDF（pc） （202KB）（3489）       Knowledge map    Save Based on the analysis of the sources and existing forms of soil arsenic, this paper approached the inter-transformation of different arsenic forms in soil. In the meanwhile, the extraction and determination methods of different soil arsenic forms were also compared. It was considered that HPLC-HG-AFS had the advantages of high sensitivity, low detection limit, better selectivity, low operation cost, and less inter-transformation of different arsenic forms, being able to be used as the prior method for the detection of different arsenic forms. Combining with previous research results, the form transformation of arsenic in soil and the promising research aspects were also discussed. Related Articles | Metrics | Comments（0）

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Molecular mechanisms of insect pests-induced plant defense. LI Xin-gang1; LIU Hui-xia2;HUANG Jian1 Chinese Journal of Applied Ecology    Abstract （2848）      PDF（pc） （656KB）（3304）       Knowledge map    Save This paper reviewed the newest research advances in insect pestsinduced plant defense, including insect pests-induced system wounding signals of plants, elicitors of insects, indirect defense, direct defense, and negative defense. In the interactions between plants and insect pests, plants can use the induced defensive substances to counteract insect pests, while the latter can use their specific elicitors to beat plant defense. This paper also compared the four metabolic pathways involved in indirect defense, i.e., lipoxygenase pathway, isoprenoid pathway, shikimate pathway, and extrfloral nectar, discussed the release mechanisms of induced volatile organic compounds in plants, and illustrated the conception of direct defense, defensive substances, and their action mechanisms. Finally, the research advances in the mechanisms of inset pests-induced negative defense of plants were reviewed, with the focus on the molecular mechanisms of insect pests-induced defense of forests. Related Articles | Metrics | Comments（0）

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Ecosystem services and their economic valuation Ouyang Zhiyun, Wang Rusong, Zhao Jingzhu Chinese Journal of Applied Ecology    1999, 10 (5): 635-640.   Abstract （5143）      PDF（pc） （638KB）（3244）       Knowledge map    Save Ecosystem services imply the natural environmental conditions and their effectiveness formed and sustained by ecosystems and ecological processes, on which, human life relies for existence. They not only supply human with the production of ecosystem goods, such as food, forage, timber, fuel, natural fiber and pharmaceuticals, but also perform fundamental life support services, which include the purification of air and water, detoxification and decomposition of wastes, regulation of climate, regeneration of soil fertility, production and maintenance of biodiversity, and mitigation of floods, droughts, and wind and water erosions. It is recognized that ecosystem services are essential to civilization. In recent years, people pay more and more attentions on the research of ecosystem services, and ecologists and economists discuss in succession the connotations and the valuation methods of ecosystem services, which have become the frontier's topics in ecology and ecological economics. In this paper, the research advances and tendencies in ecosystem services, their economic valuation and their relations to sustainable development are literaturally surveyed and discussed. Reference | Related Articles | Metrics | Comments（0）

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Effects of nitrogen addition on the kinetic parameters of soil acid phosphomonoesterase in a Moso bamboo forest ZENG Quan-xin, YUAN Xiao-chun, ZHOU Jia-cong, WU Jun-mei, LI Wen-zhou, LIN Hui-ying, ZHANG Xiao-qing, CHEN Yueh-min Chinese Journal of Applied Ecology    2022, 33 (8): 2178-2186.   DOI: 10.13287/j.1001-9332.202208.018 Abstract （281）      PDF（pc） （1225KB）（3126）       Knowledge map    Save Soil phosphatases are important in the mineralization of organophosphates and in the phosphorus (P) cycle. The kinetic mechanisms of phosphatases in response to nitrogen (N) deposition remain unclear. We carried out a field experiment with four different concentrations of N: 0 g N·hm-2·a-1(control), 20 g N·hm-2·a-1(low N), 40 g N·hm-2·a-1(medium N), and 80 g N·hm-2·a-1(high N) in a subtropical Moso bamboo forest. Soil samples were then collected from 0 to 15 cm depth, after 3, 5 and 7 years of N addition. We analyzed soil chemical properties and microbial biomass. Acid phosphatase (ACP) was investigated on the basis of maximum reaction velocity (Vm), Michaelis constant (Km), and catalytic efficiency (Ka). Results showed that N addition significantly decreased soil dissolved organic carbon (DOC), available phosphorus, and organophosphate content, but significantly increased soil ammonium, nitrate-N content, and Vm. There was a significant relationship between Vm and the concentrations of available phosphorus, organophosphate, and soil DOC. In general, N addition substantially increased Ka, but did not affect Km. The Km value in the high N treatment group was higher than that in the control group after five years of N addition. Km was significantly negatively associated with both available phosphorus and organophosphate. Medium and high N treatments had stronger effects on the kinetic parameters of ACP than low N treatment. Results of variation partition analysis showed that changes in soil chemical properties, rather than microbial biomass, dominated changes in Vm(47%) and Km(33%). In summary, N addition significantly affected substrate availability in Moso bamboo forest soil and modulated soil P cycle by regulating ACP kinetic parameters (especially Vm). The study would improve the understanding of the mechanisms underlying soil microorganisms-regulated soil P cycle under N enrichment. These mechanisms would identify the important parameters for improving soil P cycling models under global change scenarios. Reference | Related Articles | Metrics | Comments（0）

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Application of stable carbon isotope technique in the research of carbon cycling in soil-plant system. LIU Wei;Lü Hao-hao;CHEN Ying-xu; WU Wei-xiang Chinese Journal of Applied Ecology    Abstract （2891）      PDF（pc） （287KB）（3062）       Knowledge map    Save As a main life element, carbon plays important role in the matter cycling in soilplant system. Stable carbon isotope 13C has been widely used in the study of carbon cycling in soil-plant system, due to its safe, no pollution, and easy to be handled. Through the analysis of both natural and labeled 13C organic matter in soil-plant system, a better understanding of the mechanisms of photosynthesis, the distribution of photosynthates in plant-soil system, the fate of plant litter, and the source of new carbon in soil could be achieved. In this paper, the applications of stable carbon isotope technique in the researches of photosynthesis, reconstruction of paleoclimate, turnover of soil organic matter, and interactions between plants and rhizosphere microorganisms were briefly summarized, and the perspectives of the application of stable carbon isotope technique were also discussed, based on the issues existed in current researches. Related Articles | Metrics | Comments（0）

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The characteristics of soil fungal community in degraded alpine meadow in the Three Rivers Source Region, China ZHAO Wen, YIN Ya-li, LI Shi-xiong, WANG Yu-qin, WANG Yan-long Chinese Journal of Applied Ecology    2021, 32 (3): 869-877.   DOI: 10.13287/j.1001-9332.202103.038 Abstract （511）      PDF（pc） （1457KB）（3057）       Knowledge map    Save To clarify the variation of species composition, diversity, and functional structure of soil fungi community along alpine meadow degradation,we examined the characteristics and controlling factors of soil fungal communities in non-degraded, lightly degraded, moderately degraded, severely degraded and extremely degraded (black soil beach) alpine meadows at the Three Rivers Source Region, based on the high-throughput gene sequencing and FUNGuild functional prediction. The results showed that the dominant phyla in alpine meadow soil were Ascomycota, Basidiomycetes, and Mortierellomycota. Species composition of soil fungal community varied greatly in alpine meadow under different levels of degradation. The abundance of Cladosporium flabelliforme, Entoloma sodale, Hygrocybe conica, Inocybe sp. and Trichocladium opacum increased, while that of Gibberella tricincta and Dactylonectria macrodidyma decreased following grassland degradation. The meadow under severe degradation had higher soil fungal Chao1 index, while that under light degradation had lower Shannon index and Simpson index. The abundance of pathologic, symbiotic, and saprophytic types of fungi varied among different alpine meadows. Along with the grassland degradation, the abundance of soil symbiotic fungi decreased, while that of pathological fungi increased. The soil fungal community and functional compositions changed obviously with degradation in the alpine meadow. Plant aboveground biomass, soil water content, pH, total organic carbon, total nitrogen, ammonium nitrogen, available phosphate, total potassium and AN/AP (ratio of available nitrogen and available phosphorus) were the main driving factors for the variations in soil fungal community structure. Reference | Related Articles | Metrics | Comments（0）

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Chinese Journal of Applied Ecology    Abstract （2520）      PDF（pc） （267KB）（2961）       Knowledge map    Save Related Articles | Metrics | Comments（0）

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Relationships between row crop evapotranspiration and two sources-energy partition and exchange under non-water stress condition YU Chan1;Chaolunbagen1;GAO Ruizhong1;CHAI Jianhua2 Chinese Journal of Applied Ecology    Abstract （2504）      PDF（pc） （11570KB）（2866）       Knowledge map    Save crop coefficient approach presented in FAO-56,this paper estimated the available energy partitioned into two sources,canopy and soil surface (Ac and As),and the latent and sensible heat fluxes,λEc,λEs,Hc and Hs.The results showed that under non-water stress condition,the interaction between Hc and λEc made canopy absorbed a micro-advection to enhance transpiration expressed by latent heat flux,with the value of (λEci-Aci).The greatest enhancement of transpiration occurred at the crop development stage with leaf area index between 0.6 and 2.4,and the average of the enhancement was 4.32 MJ·m-2·d-1.Soil evaporation was in progress with a rate below the available energy of soil,due to the interaction between Hc and λEc under non-water stress condition,except a few days immediately after heavy rain.The evaporation rate depended on the percentage of soil available energy dissipated as latent heat flux.The average value of minimum percentage,11.5%,occurred at mid-season stage,while that of maximum percentages,51.9%,occurred at initial stage.Latent heat fluxes were the important components of energy exchange during the process of evapotranspiration.The available energy dissipated as latent heat fluxes of the two sources during crop development,mid-season,and late season stages accounted for over 83% of the total energy. Related Articles | Metrics | Comments（0）

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Effects of selenium fertilization on selenium availability in rice soil. ZHANG Mu, TANG Shuan-hu, ZHONG Song-zhen, LI Ping, FU Hong-ting Chinese Journal of Applied Ecology    2018, 29 (9): 2979-2987.   DOI: 10.13287/j.1001-9332.201809.022 Abstract （644）      PDF（pc） （1030KB）（2856）       Knowledge map    Save Selenium (Se) is easy to be fixed in acidic rice soil of South China, and thus its availability is low. The aim of this study was to investigate the influence of Se fertilizer on Se availability in rice rhizosphere and non-rhizosphere soils. The results showed that Se application increased yield and rice Se concentration. The water soluble, exchangeable, Fe/Mn oxide-bound, organic matter/sulfide-bound, and residual Se contents of the rhizosphere soil were lower than those of the non-rhizosphere soil. There was no significant difference in the migration coefficient of Se between the rhizosphere and non-rhizosphere soils. Se application had no significant effect on the migration coefficient of Se between roots and leaves but improved its migration coefficient between leaves and grains. The secretion of organic acids was increased by the application of 0.5 mg·kg-1 and decreased by the application of 1.0 and 5.0 mg·kg-1 Se. The secretion of organic acids had no significant effect on the rhizosphere soil pH. The pH of rhizosphere soil was higher than that of the non-rhizosphere soil, while the application of Se decreased the pH of the rhizosphere soil. With the increases of Se application, the intensity of the infrared absorption of clay mineral (kaolinite) in the rhizosphere soil showed an increasing trend. In this study, most of the Se was transformed into forms that were difficult to be absorbed and utilized by rice and difficult to move to rhizosphere soil. The enhancement of soil Se availability following the secretion of organic acids was not due to its effects on soil pH. Reference | Related Articles | Metrics | Comments（0）

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Trophic niche and gut microbiota of Dosidicus gigas in the eastern equatorial Pacific Ocean GAO Xiao-di, GONG Yi, CHEN Xin-jun, LI Yun-kai Chinese Journal of Applied Ecology    2021, 32 (3): 1087-1095.   DOI: 10.13287/j.1001-9332.202103.035 Abstract （472）      PDF（pc） （966KB）（2835）       Knowledge map    Save Understanding the adaptation of important marine species to environmental changes is critical for evaluating the effects of fisheries and climate change on marine services. The jumbo squid, Dosidicus gigas, is a keystone species in the eastern Pacific, which plays an intermediate role in the marine food web. Better understanding of their responses to climate change would be a big step to understand their population dynamics. In this study, stable isotope and high-throughput 16S rRNA sequencing were used to compare the variation of trophic niche, gut length, and gut microbiota of D. gigas in the eastern equatorial water during normal and El Niño periods. The results showed a significant variation in δ13C values for D. gigas in different periods, indicating differences in their food sources. The main phylum-level gut microbiome included Actinobacteria, Bacteroidetes, Cyanobacteria, Firmicutes, Proteobacteria, and Tenericutes. There was no significant difference in the gut microbial composition during normal and El Niño periods, but differences in gut microbial diversity and relative abundance of some phyla bacteria. El Niño events could decrease the trophic niche breadth of D. gigas, and positively impact gut length and gut microbial diversity and richness. Firmicutes, Bacteroidetes, Spirochaetes, WPS-2, and Kiritimatiellaeota had a significant increase in the gut microbiota of D. gigas combined with a more concentrated intraspecific rank of distance during El Niño, suggesting that the changes of habitat and food sources caused by El Niño events could limit the distribution range of D. gigas. D. gigas might change their digestive system to improve the digestive and absorption capacity and enhance their immunocompetence. Such a climate-driven alteration might help D. gigas rapidly adapt to the changes of environmental conditions and food resources under El Niño. Reference | Related Articles | Metrics | Comments（0）

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Characteristics and influencing factors of soil nitrification potential in coastal salinized farmland LI Hong-qiang, YAO Rong-jiang, YANG Jing-song, WANG Xiang-ping, XIE Wen-ping, ZHANG Xin Chinese Journal of Applied Ecology    2022, 33 (8): 2205-2212.   DOI: 10.13287/j.1001-9332.202208.017 Abstract （291）      PDF（pc） （1149KB）（2816）       Knowledge map    Save Understanding the nitrification capacity of coastal saline farmland soils and its main drivers is of great significance to regulate soil nitrification and improve the utilization efficiency of nitrogen fertilization in farmland. Using a combination of field investigations and laboratory analyses, we examined farmland soil nitrification potential and soil physical, chemical, and biological properties in the coastal muddy tidal flat saline soil area (Dongying and Dongtai). We established the correlation between soil properties and soil nitrification potential with multiple stepwise regression analyses and structural equation modeling (SEM). The results showed that soil pH value was relatively stable and other soil properties and soil nitrification potential varied in coastal saline farmland. The soil nitrification potential ranged from 0.04 to 10.42 mg·kg-1·d-1 and decreased with the increases of soil salinization level. Soil nitrification potential had the strongest correlation with soil organic matter, cation exchange capacity, and Cl-, with the correlation coefficient being 0.409, 0.397 and -0.337, respectively. The results of multiple stepwise regression analysis showed that Na+, silt, cation exchange capacity, and CO32-+HCO3- were the main influencing factors of soil nitrification potential. The results from the SEM analysis suggested that Na+, silt, cation exchange capacity, and CO32-+HCO3- directly affected soil nitrification potential, and soil organic matter, clay, Cl- and SO42- had indirect effects. In all, soil Na+ and cation exchange capacity were the two main factors affecting nitrification. Adjusting soil NaCl content and cation exchange capacity was an effective means of regulating soil nitrification. Reference | Related Articles | Metrics | Comments（0）