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Simulated nitrogen deposition decreases of soil microbial diversity in a semiarid grassland, with little mediation of this effect by mowing
Pedobiologia ( IF 2.3 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.pedobi.2020.150644 Hai-Wei Wei , Xiao-Guang Wang , Ying-Bin Li , Jun-Jie Yang , Jun-Feng Wang , Xiao-Tao Lü , Xing-Guo Han
Pedobiologia ( IF 2.3 ) Pub Date : 2020-05-01 , DOI: 10.1016/j.pedobi.2020.150644 Hai-Wei Wei , Xiao-Guang Wang , Ying-Bin Li , Jun-Jie Yang , Jun-Feng Wang , Xiao-Tao Lü , Xing-Guo Han
Abstract Atmospheric nitrogen (N) deposition has important effects on soil microbial community diversity and composition. While it is well-known that mowing, a widely used grassland management strategy, could mediate the impacts of N enrichment on macro-organism community composition, much less known is the intra-annual variation of soil microbial community and their responses to N deposition and mowing. Here, we examined the responses of soil bacteria and fungi communities to N deposition and mowing in four months of different seasons in a semiarid grassland in northern China. Nitrogen addition significantly reduced alpha-diversity and changed the community composition of both bacteria and fungi communities across generally all months, possibly due to N-induced soil acidification. Mowing did not affect soil microbial community diversity and did not mediate the impacts of N addition. Soil microbial community diversity and composition significantly varied across different months. Such temporal variation of soil microbial community composition was much greater than the variation resulting from N addition and mowing. Our results suggest that the negative impacts of N enrichment on soil bacteria and fungi diversity are temporally consistent and are unaffected by plant biomass removal.
更新日期：2020-05-01
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