文献类型：期刊文献

英文题名：Long-term phosphorus addition alleviates CO2 and N2O emissions via altering soil microbial functions in secondary rather primary tropical forests*

作者：Chen, Jie[1] Ma, Xiaomin[2] Lu, Xiankai[3] Xu, Han[1] Chen, Dexiang[1] Li, Yanpeng[1] Zhou, Zhang[1] Li, Yide[1] Ma, Suhui[4] Yakov, Kuzyakov[5,6]

第一作者：陈洁

通信作者：Xu, H[1]

机构：[1]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Peoples R China;[2]Zhejiang A&F Univ, State Key Lab Subtrop Silviculture, Hangzhou 311300, Peoples R China;[3]Chinese Acad Sci, Key Lab Vegetat Restorat & Management Degraded Eco, South China Bot Garden, Guangzhou 510650, Peoples R China;[4]Peking Univ, Inst Ecol, Coll Urban & Environm Sci, Beijing 100871, Peoples R China;[5]Univ Gottingen, Dept Soil Sci Temperate Ecosyst, Dept Agr Soil Sci, D-37077 Gottingen, Germany;[6]RUDN Univ, Peoples Friendship Univ Russia, Moscow 117198, Russia

年份：2023

卷号：323

外文期刊名：ENVIRONMENTAL POLLUTION

收录：;EI(收录号：20230913645540);Scopus(收录号：2-s2.0-85148763667);WOS:【SCI-EXPANDED(收录号:WOS:000948500800001)】；

基金：This study was supported by the National Natural Science Foundation of China (31901161 and 32001170), the Central Public-interest Scientific Institution Basal Research Fund, China (CAFYBB2020QB003), the Science and Technology Planning Project of Guangzhou (202102021182), and the RUDN University Strategic Academic Leadership Program. We thank LetPub ( www.letpub.com ) for its linguistic assistance during the preparation of this manuscript.

语种：英文

外文关键词：Nutrient addition; Microbial functional genes; Substrate stoichiometry; Greenhouse gas emission; Phosphorus limitation; Tropical forest

摘要：Tropical forests, where the soils are nitrogen (N) rich but phosphorus (P) poor, have a disproportionate influence on global carbon (C) and N cycling. While N deposition substantially alters soil C and N retention in tropical forests, whether P input can alleviate these N-induced effects by regulating soil microbial functions remains unclear. We investigated soil microbial taxonomy and functional traits in response to 10-year independent and interactive effects of N and P additions in a primary and a secondary tropical forest in Hainan Island. In the primary forest, N addition boosted oligotrophic bacteria and phosphatase and enriched genes responsible for C-, P-mineralization, nitrification and denitrification, suggesting aggravated P limitation while N excess. This might stimulate P excavation via organic matter mineralization, and enhance N losses, thereby increasing soil CO2 and N2O emissions by 86% and 110%, respectively. Phosphorus and NP additions elevated C-mining enzymes activity mainly due to intensified C limitation, causing 82% increase in CO2 emission. In secondary forest, P and NP additions reduced phosphatase activity, enriched fungal copiotrophs and increased microbial biomass, suggesting removal of nutrient deficiencies and stimulation of fungal growth. Meanwhile, soil CO2 emission decreased by 25% and N2O emission declined by 52-82% due to alleviated P acquisition from organic matter decomposition and increased microbial C and N immobilization. Overall, N addition accelerates most microbial processes for C and N release in tropical forests. Long-term P addition increases C and N retention via reducing soil CO2 and N2O emissions in the secondary but not primary forest because of strong C limitation to microbial N immobilization. Further, the seasonal and annual variations in CO2 and N2O emissions should be considered in future studies to test the generalization of these findings and predict and model dynamics in greenhouse gas emissions and C and N cycling.