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Lowered water table causes species substitution while nitrogen amendment causes species loss in alpine wetland microbial communities
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作者 Yuntao LI Jin-Sheng HE +3 位作者 Hao WANG Jizhong ZHOU Yunfeng YANG Haiyan CHU 《Pedosphere》 SCIE CAS CSCD 2021年第6期912-922,共11页
Alpine wetlands are hotspots of carbon(C)storage and methane emission,and they could be key contributors to global warming.In recent years,rapid warming has lowered the water table in alpine wetlands on the Tibetan Pl... Alpine wetlands are hotspots of carbon(C)storage and methane emission,and they could be key contributors to global warming.In recent years,rapid warming has lowered the water table in alpine wetlands on the Tibetan Plateau,concurrent with intensified nitrogen(N)deposition via anthropogenic activities.We carried out a field experiment to investigate the ecological impacts of these two factors on soil bacterial and functional communities,which are essential drivers of greenhouse gas emissions.Nitrogen amendment alone decreased the phylogenetic alpha-diversity of bacterial communities which could be offset by lowered water table.In contrast,microbial functional alpha-diversity,revealed by a high-throughput microarray,remained unchanged.Both bacterial and functional beta-diversity responded to lowered water table,but only bacterial community responded to N amendment.The alpha-Proteobacteria,beta-Proteobacteria,and Bacteroidetes were the major responsive bacterial lineages,and C degradation,methanogenesis,alkaline shock,and phosphorus oxidation were the major responsive functional processes.Partitioning analysis revealed that N amendment changed bacterial community structure mainly via species loss processes but did not affect bacterial functional communities,with soil pH and ammonium as the key factors influencing changes in bacterial community structure.Conversely,lowered water table altered bacterial and functional communities through species substitution processes linked to soil pH and soil moisture.According to our results,the response mechanisms of microbial communities to lowered water table and N amendment are fundamentally different in alpine wetlands. 展开更多
关键词 ALPHA-DIVERSITY bacterial community BETA-DIVERSITY microbial functional community N amendment water table lowering
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Water Environmental Degradation of the Source Area of the Yellow River on Northeast Qinghai-Tibet Plateau
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作者 Qi Shanzhong 1, Luo Fang 2 & Xiao Honglang 2 1 College of Population, Resources and Environment, Shandong Normal University, Jinan 250014, China 2 Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academic of Sciences, Lanzhou, 730000, China 《Chinese Journal of Population,Resources and Environment》 北大核心 2005年第3期34-36,共3页
The issue on water environmental degradation in the source area of the Yellow River has been one of very serious ecological and socially economic problems. The temporal-spatial changes of water environment led to the ... The issue on water environmental degradation in the source area of the Yellow River has been one of very serious ecological and socially economic problems. The temporal-spatial changes of water environment led to the decreasing of land capacity and river disconnecting. The status of water environmental degradation in this paper was analyzed based on the data and field investigation. The results indicated that the surface water area in the region has obviously decreased owing to the climate changes and human irrational use of water resources and the continuous lowering of the regional groundwater table and the steadily decreasing tendency of the flow rate in the source areas of the Yellow River. 展开更多
关键词 water environmental degradation decreasing of surface water continuous lowering of groundwater table the Yellow River region Qinghai- Tibet Plateau
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