文献类型：期刊文献

英文题名：The mechanisms and potentially positive effects of seven years of delayed and wetter wet seasons on nitrous oxide fluxes in a tropical monsoon forest

作者：Gong, Yu[2] Sun, Feng[3,4] Wang, Faming[4] Lambers, Hans[5] Li, Yingwen[4] Zhong, Qiuping[6] Chen, Jie[7] Li, Zhian[4] Wang, Mei[1]

第一作者：Gong, Yu

通信作者：Wang, M[1]

机构：[1]South China Normal Univ, Sch Geog Sci, Guangzhou 510631, Peoples R China;[2]Chinese Acad Sci, Key Lab Aquat Bot & Watershed Ecol, Wuhan Bot Garden, Wuhan 430074, Peoples R China;[3]South China Normal Univ, Coll Life Sci, Guangzhou 510631, Peoples R China;[4]Chinese Acad Sci, Key Lab Vegetat Restorat & Management Degraded Eco, Xiaoliang Res Stn Trop Ecosyst, South China Bot Garden, Guangzhou 510650, Peoples R China;[5]Univ Western Australia, Sch Biol Sci, Perth, WA 6009, Australia;[6]Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangzhou 510275, Peoples R China;[7]Chinese Acad Forest, Res Inst Trop Forestry, Guangzhou 510520, Peoples R China

年份：2022

卷号：412

外文期刊名：GEODERMA

收录：;EI(收录号：20220511560062);Scopus(收录号：2-s2.0-85123603989);WOS:【SCI-EXPANDED(收录号:WOS:000794296600001)】；

基金：This study was made possible by the support of the following funding to M. Wang: the National Science Foundation of China (Grant No. 31901163, 32171583), General Program of Guangdong Provincial Natural Science Foundation (2019A1515011568) and to Prof. F. Wang: the National Natural Science Foundation of China (31870463), the Guangdong Basic and Applied Basic Research Foundation (2021B1515020011), the CAS Youth Innovation Promotion Association (2021347) and the National Forestry and Grassland Administration Youth Talent Support Program (2020BJ003).

语种：英文

外文关键词：Precipitation change; Wetter wet season; Delayed wet season;

N2O

摘要：Tropical forest soils contribute to global warming and ozone depletion due to large nitrous oxide (N2O) emissions. However, it is unknown whether the soil N2O fluxes will change under ongoing precipitation regime changes. In this study, two typical precipitation regimes were simulated in a tropical monsoon forest for seven years: delayed wet season (DW) and wetter wet season (WW). Although we did not find significant effects of the precipitation changes on soil N2O fluxes annually or seasonally, significant increases in soil N2O emission were observed in treatment months for DW and WW. Importantly, the underlying mechanisms for their effects were different. For the DW treatment, the increase in soil N2O emission was attributed to the increase in abundance of nitrifying bacteria (amoA), which provide nitrate for N2O production, and to the changed microbial structure of denitrifying bacteria (nosZ), which reduce N2O consumption. For the WW treatment, the stimulation of soil N2O emission was attributed to the relatively large increase in N2O production via an increased abundance of denitrifying bacteria (nirS) compared with the increased N2O consumption via increased abundance of N2O reducing bacteria (nosZ). If the projected precipitation regimes of delayed or wetter wet seasons last for more than two months, the N2O emitted from tropical forest soils has the potential to significantly increase due to specific microbial nitrogen transformation processes. This increase implies that the contribution of tropical forests to global warming and ozone depletion would increase, depending on precipitation regimes.& nbsp;