首页|Soil bacterial and fungal communities resilience to long-term nitrogen addition in subtropical forests in China
Soil bacterial and fungal communities resilience to long-term nitrogen addition in subtropical forests in China
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Atmospheric nitrogen(N)deposition is pre-dicted to increase,especially in the subtropics.However,the responses of soil microorganisms to long-term N addi-tion at the molecular level in N-rich subtropical forests have not been clarified.A long-term nutrient addition experi-ment was conducted in a subtropical evergreen old-growth forest in China.The four treatments were:control,low N(50 kg N ha-1 a-1),high N(100 kg N ha-1 a-1),and com-bined N and phosphorus(P)(100 kg N ha-1 a-1+50 kg P ha-1 a-1).Metagenomic sequencing characterized diversity and composition of soil microbial communities and used to construct bacterial/fungal co-occurrence networks.Nutri-ent-treated soils were more acidic and had higher levels of dissolved organic carbon than controls.There were no significant differences in microbial diversity and commu-nity composition across treatments.The addition of nutri-ents increased the abundance of copiotrophic bacteria and potentially beneficial microorganisms(e.g.,Gemmatimona-detes,Chaetomium,and Aureobasidium).Low N addition increased microbiome network connectivity.Three rare fungi were identified as module hubs under nutrient addi-tion,indicating that low abundance fungi were more sen-sitive to increased nutrients.The results indicate that the overall composition of microbial communities was stable but not static to long-term N addition.Our findings provide new insights that can aid predictions of the response of soil microbial communities to long-term N addition.
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