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ISSN 0256-307X(Print)
ISSN 1741-3540 (Online)
CN 11-1959/O4
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  Chinese Journal of Applied Ecology--2019, 30 (8)   Published: 15 August 2019
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Reviews

Tree seedling distribution, regeneration mechanism and response to climate change in alpine treeline ecotone

SHAO Jia-yi, DU Jian-hui, LI Sheng-fa, HUANG Yi-xin, LIANG Wei-nuo, LIAO Jia-qiang
Chinese Journal of Applied Ecology. 2019, 30 (8): 02854 doi: 10.13287/j.1001-9332.201908.007
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Tree seedlings are one of the important components in alpine treeline ecotone, whose regeneration is crucial to treeline migration in response to climate change. We analyzed the spatial distribution, regeneration of tree seedlings and their responses to climate change in treeline ecotone in recent decades. The spatial distribution of tree seedlings in treeline ecotone is dominated by diffuse and clustered forms, with different indicative significance for spatial dynamics of treeline. At global scale, the altitude distribution limits of tree seedlings are usually related to the length and average temperature of growing season, along with the species characteristics. However, precipita-tion plays an important role at regional scale. The initial stage of seedling recruitment is restricted by seed source, which determines seed distribution and germination to a great extent. Microenvironment facilitates seedling regeneration by providing shelter for establishment and improving their survival rate. The regeneration process is more relevant to multiple biotic, abiotic factors and their interactions. With global warming, rising temperature in treeline ecotone and more precipitation are more suitable for seedling regeneration of treeline species. The expansion of seedlings to higher elevations could be considered as the portent of timberline upwards migration. Due to species-specific adaption strategy, however, some trees only increase seedling density and timberline location is constant. In the future, it is necessary to take precise dating techniques, such as tree-ring and 14C dating, and conduct long-term in-situ monitoring and indoor simulation experiments. To provide scientific basis for mountain ecosystem restoration and conservation, we should strengthen the studies on spatial patterns and regeneration mechanism of seedlings in treeline ecotone at multiple spatio-temporal scales, the adaptation strategies of tree seedlings in different types of treeline ecotone and treeline dynamics prediction.

Microbial characteristics and eco-health implication of mineral spring water in Wudalianchi, Northeast China

GAO Si-meng, WEN Yu-juan, ZHANG Wen-qing, ZHANG Da-zhi, YANG Yue-suo
Chinese Journal of Applied Ecology. 2019, 30 (8): 02865 doi: 10.13287/j.1001-9332.201908.036
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Mineral spring water is a top quality potable groundwater resource formed by long-term groundwater-rock interaction in aquifer. Mineral spring water is rich in minerals and trace elements which are beneficial for human health. Given the current serious water pollution and environment deterioration, it is of great significance to re-recognize the ecological and health effects of mineral water based on new scientific and technological achievement. The Wudalianchi scenic area in Heilongjiang Province has abundant mineral water and peloid resources, which supported the development of tourism and convalescence and have been used in medical and health care for more than 100 years. However, it is threatened by resource reduction, environmental pollution, and other problems. Here, we reviewed the formation process, distribution, hydro-biochemical characteristics and health effects of the Wudalianchi mineral springs, with particular focus on the advances of microbial studies in this area. We also proposed the future research prospective for the Wudalianchi mineral water. To better protect and utilize the Wudalianchi mineral water, it was recommended that a green eco-agriculture practice in reducing chemical fertilizers should be adapted in the surrounding farms of Wudalianchi. Along with the development of tourism and recuperation resources, it is necessary to establish a framework of pollution risk assessment and control, and strictly reduce potential emerging pollutants to eco-geological environment.

Distribution, diffuse, and removal of tetracyclines and sulfonamide antibiotic resistance genes in wastewater treatment plant: A review.

WANG Guo-lan, FENG Jin-lu, LUO Ling, LOU Li-ping
Chinese Journal of Applied Ecology. 2019, 30 (8): 02875 doi: 10.13287/j.1001-9332.201908.028
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The contamination of antibiotic resistance genes (ARGs) caused by abuse of antibiotics has attracted more and more attention. Due to their low price, tetracyclines and sulfonamides are widely used. The plenty of residual tetracyclines and sulfonamides is discharged into wastewater treatment plant (WWTPs), with consequent ARGs pollution. To understand the current status of ARGs contamination and removal efficiency, we summarized the distribution and spread mechanism of tetracyclines and sulfonamides ARGs, and further emphasized the ARGs removal efficiency across different treatment technologies. Based on the current knowledge and lack of ARGs, future work were proposed, such as investigating ARGs contamination in WWTPs, improving ARGs removal technologies, exploring spread mechanisms of ARGs.

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