Mowing did not mitigate the negative effects of nitrogen deposition on soil nematode community in a temperate steppe  

作　　者：YINGBIN LI SIWEI LIANG XIAOFANG DU Xinchang Kou Xiaotao Lv Qi Li 

机构地区：[1]Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China [2]College of Land and Environment,Shenyang Agricultural University,Shenyang 110866,China,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang 110016,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]School of Geographical Sciences,Northeast Normal University,Changchun 130024,China

出　　处：《Soil Ecology Letters》2021年第2期125-133,共9页土壤生态学快报（英文）

基　　金：This research was supported by the K.C.Wong Education Foundation(GJTD-2019-10);the National Natural Science Foundation of China(41877047);the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB15010402).

摘　　要：Soil nematodes are the most numerous components of the soil fauna in terrestrial ecosystems.The occurrence and abundance of nematode trophic groups determine the structure and function of soil food webs.However,little is known about how nitrogen deposition and land-use practice(e.g.mowing)affect soil nematode communities.We investigated the main and interactive effects of nitrogen addition and mowing on soil nematode diversity and biomass carbon in nematode trophic groups in a temperate steppe in northern China.Nitrogen addition and mowing significantly decreased the abundance of soil nematodes and trophic diversity but had no effects on nematode richness and the Shannon-Wiener diversity.Nitrogen addition influenced soil nematode communities through decreasing soil pH.Mowing influenced soil nematode communities through decreasing soil moisture.Nitrogen addition enhanced the bacterial energy channel but mowing promoted fungal energy channel in the soil micro-food web.Our study emphasizes that ecosystem function supported by soil organisms can be greatly influenced by nitrogen deposition,and mowing cannot mitigate the negative effects of nitrogen deposition on soil food webs.

关 键 词：Nematode biomass carbon Trophic group Soil food web Grassland management Nitrogen enrichment 

分 类 号：S15[农业科学—土壤学]