urbanization

litter

autoantibodies

emphysema

pancreatectomy

loess

nitrogen addition

thyrotropin

brasil

cash flows

microbial_131197

microbial_52081

please use get_47511

gang

atmospheric deposition

microbial_131138

ha yr

multifunctionality

nitrogen_79906

Soil Biology and Biochemistry

While aboveground biodiversity has been widely studied, how microbial biodiversity responds to increasing nitrogen (N) deposition is still unclear. Here we conducted a meta-analysis to investigate the responses of soil microbial diversity and composition to N addition. Overall, we found N addition decreased both soil microbial diversity and the relative abundance of Actinobacteria and Nitrospirae , although the effect may vary among different ecosystems. The effect size on microbial Shannon index was positively correlated with the changes in soil microbial biomass under N addition. The initial soil conditions, the duration of treatment, the N addition rate and changes in soil organic carbon under N addition all affected the effect sizes of N addition on microbial Shannon index, while changes in soil pH played a minor role. Overall, our results suggest that the losses of microbial diversity with increasing N deposition rate would alter ecosystem functions and may have profound feedbacks to global climate change .

Decreasing soil microbial diversity is associated with decreasing microbial biomass under nitrogen addition