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| Response of soil nematode community structure to nitrogen deposition in the alpine wetland of Swan Lake under different water conditions |
| Received:January 17, 2023 |
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| KeyWord:nitrogen deposition;soil nematodes;alpine wetlands;ecological index;moisture content |
| Author Name | Affiliation | E-mail | | CHEN Kangyi | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China | | | HAN Yaoguang | College of Grassland Science, Xinjiang Agricultural University, Urumqi 830052, China | | | WANG Jiali | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China | | | SHEN Zhibo | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China | | | YANG Beibei | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China | | | ZHAO Yi | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China | | | ZHU Xinping | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China
College of Biological and Resource Environment, Beijing University of Agriculture, Beijing 102206, China | zhuxinping1978@163.com | | JIA Hongtao | College of Resources and Environment, Xinjiang Agricultural University, Urumqi 830052, China
Xinjiang Key Laboratory of Soil and Plant Ecological Processes, Urumqi 830052, China | |
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| Abstract: |
| The effect of nitrogen deposition on soil nematode community structure in an arid alpine wetland was determined in this study. The Bayanbulak Swan Lake alpine wetland in central Tianshan Mountains was taken as the sample site. Two areas with different water conditions were sprayed with three different concentrations of nitrogen. The response of soil nematode community structure to nitrogen deposition in the different water conditions was studied by in-situ simulated nitrogen deposition control experiments. Prodorylamus (29.30%)was the dominant genus of the soil nematode community under seasonal surface water conditions. The dominant nematodes in perennial dry soil were Prodorylamus(18.69%), Laimydorus(20.21%), and Helicotylenchus(33.48%). Under the combined effect of soil water and nitrogen, the abundance of omnivorous/predatory nematodes(OP) and fungivorous nematodes(FU) increased, while the abundance of plant parasitic nematodes(PP) decreased. In perennial dry soil, nitrogen deposition did not significantly affect these ecological indices in soil nematode communities. Under seasonal surface waterlogged conditions, the enrichment(EI)and maturity(PPI) indices initially decreased then increased with increasing nitrogen concentration. However, nitrogen addition had no significant effect on the shannon index(H)and dominance(λ)indices in soil nematode communities. It was observed that addition of 20 kg·hm-2·a-1 nitrogen promoted the development of the organic matter decomposition pathway by bacteria and fungi in the alpine wetland soil of the arid area. Soil water content, soil conductivity, and alkali-hydrolyzed nitrogen were the main factors affecting soil nematode community structure. The findings indicate that increased nitrogen deposition can affect the abundance of different trophic groups in soil nematode communities but has little impact on the structural diversity of soil nematode communities and stability of the alpine wetland ecosystem in arid areas. |
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