文献类型：期刊文献

英文题名：Effects of seven-year nitrogen and phosphorus additions on soil microbial community structures and residues in a tropical forest in Hainan Island, China

作者：Ma, Suhui[1,2] Chen, Guoping[1,2] Tian, Di[3] Du, Enzai[4] Xiao, Wen[1,2] Jiang, Lai[1,2] Zhou, Zhang[5] Zhu, Jiangling[1,2] He, Hongbo[6] Zhu, Biao[1,2] Fang, Jingyun[1,2]

第一作者：Ma, Suhui

通信作者：Fang, JY[1];Fang, JY[2]

机构：[1]Peking Univ, Inst Ecol, Coll Urban & Environm Sci, Beijing 100871, Peoples R China;[2]Peking Univ, Key Lab Earth Surf Proc, Minist Educ, Beijing 100871, Peoples R China;[3]Capital Normal Univ, Coll Life Sci, Beijing 100048, Peoples R China;[4]Beijing Normal Univ, Fac Geog Sci, Sch Nat Resources, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China;[5]Chinese Acad Forestry, Res Inst Trop Forestry, Jianfengling Natl Key Field Observat & Res Stn Fo, Guangzhou 510520, Peoples R China;[6]Chinese Acad Sci, Inst Appl Ecol, Shenyang 110016, Peoples R China

年份：2020

卷号：361

外文期刊名：GEODERMA

收录：;EI(收录号：20195007809504);Scopus(收录号：2-s2.0-85075986141);WOS:【SCI-EXPANDED(收录号:WOS:000510804700032)】；

基金：This work was supported by the National Key Research and Development Program of China (2017YFC0503903), the National Science Foundation of China (31621091), the China Postdoctoral Science Foundation (2018M631247) and the CAS Interdisciplinary Innovation Team. We thank Hanyue Huang, Luhong Zhou, Haojie Su, Junling Lu and Anwar Eziz for their helpful suggestions for data analysis and a friendly review of the manuscript. We also thank two anonymous referees for their helpful and constructive comments.

语种：英文

外文关键词：Tropical forests; Nitrogen deposition; Phosphorus deposition; Soil organic carbon; Microbial community structure; Amino sugars

摘要：Microbial residue retention is critical for soil organic carbon (SOC) accumulation in forests. However, the changes in soil microbial residues under atmospheric nitrogen (N) and phosphorus (P) deposition in tropical forests remain unclear. Here, we measured soil phospholipid fatty acids, enzyme activity, and amino sugars (biomarkers of microbial residues) in a seven-year N and P addition experiment in a secondary tropical montane rainforest. Our results showed that five years of nutrient additions showed no significant effect on microbial community structure but the effect became significant at the seventh year. In N addition plots, a decrease in the arbuscular mycorrhizal fungal biomass resulted in declines in the contribution of fungal residues to SOC and the ratio of fungal to bacterial residues. The fungi:bacteria ratio increased in P and N&P addition plots while the fungal residue:bacterial residue ratio was decreased by P addition, which may be related to an imbalance in microbial residue decomposition. Both extracellular enzyme activities and SOC showed minor changes under nutrient additions. Our results suggest that changes in microbial community structure and enzyme activity induced by N and P deposition may alter the accumulation and composition of microbial residues in SOC in N-rich tropical forests.