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Effects of nitrogen addition on microbial residues and their contribution to soil organic carbon in China’s forests from tropical to boreal zone by Suhui Ma; Guoping Chen; Enzai Du; Di Tian; Aijun Xing; Haihua Shen; Chengjun Ji; Chengyang Zheng; Jianxiao Zhu; Jiangling Zhu; Hanyue Huang; Hongbo He; Biao Zhu; Jingyun Fang is a Environmental Science article available to read on EtoBox.

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Atmospheric nitrogen (N) deposition has a significant influence on soil organic carbon (SOC) accumulation in forest ecosystems. Microbial residues, as by-products of microbial anabolism, account for a significant fraction of soil C pools. However, how N deposition affects the accumulation of soil microbial residues in different forest biomes remains unclear. Here, we investigated the effects of six/seven-year N additions on microbial residues (amino sugar biomarkers) in eight forests from tropical to boreal zone in eastern China. Our results showed a minor change in the soil microbial residue concentrations but a significant change in the contribution of microbial residue-C to SOC after N addition. The contribution of fungal residue-C to SOC decreased under low N addition (50 kg N ha yr) in the tropical secondary forest (-19%), but increased under high N addition (100 kg N ha yr) in the temperate Korean pine mixed forest (+21%). The contribution of bacterial residue-C to SOC increased under the high N addition in the subtropical Castanopsis carlesii forest (+26%) and under the low N addition in the temperate birch forest (+38%), respectively. The responses of microbial residue-C in

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Author

Suhui Ma; Guoping Chen; Enzai Du; Di Tian; Aijun Xing; Haihua Shen; Chengjun Ji; Chengyang Zheng; Jianxiao Zhu; Jiangling Zhu; Hanyue Huang; Hongbo He; Biao Zhu; Jingyun Fang

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV; Publons (ISSN 0269-7491)

Published

2020

Language

EN

Field

Environmental Science (Physical Sciences)