文献类型：期刊文献

英文题名：Intensified Precipitation Seasonality Reduces Soil Inorganic N Content in a Subtropical Forest: Greater Contribution of Leaching Loss Than N2O Emissions

作者：Chen, Jie[1,2,3] Kuzyakov, Yakov[4,5,6] Jenerette, G. Darrel[7] Xiao, Guoliang[1,3] Liu, Wei[1] Wang, Zhengfeng[1] Shen, Weijun[1]

第一作者：Chen, Jie;陈洁

通信作者：Shen, WJ[1]

机构：[1]Chinese Acad Sci, South China Bot Garden, Key Lab Vegetat Restorat & Management Degraded Ec, Guangzhou, Guangdong, Peoples R China;[2]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou, Guangdong, Peoples R China;[3]Univ Chinese Acad Sci, Beijing, Peoples R China;[4]Univ Gottingen, Dept Soil Sci Temperate Ecosyst, Dept Agr Soil Sci, Gottingen, Germany;[5]RUDN Univ, Agrotechnol Inst, Moscow, Russia;[6]Kazan Fed Univ, Inst Environm Sci, Kazan, Russia;[7]Univ Calif Riverside, Dept Bot & Plant Sci, Riverside, CA 92521 USA

年份：2019

卷号：124

期号：3

起止页码：494-508

外文期刊名：JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000464653200004)】；

基金：We thank Yongbiao Lin, Zhipeng Chen, and Shengxing Fu for the help with the installation of the precipitation manipulation facilities, and we thank Taotao Li, Chunqing Long, and Xuan Zhou for their help with laboratory assays. We thank the two anonymous referees' constructive comments for the improvement of the paper, and Kara Bogus, PhD, for editing the English text. Financial support came from the National Natural Science Foundation of China (31425005, 31130011, 41671253, and 31290222), the Guangdong BaiQianWan Talents Program. The manuscript was prepared with the support of the "RUDN University program 5-100" and the Government Program of Competitive Growth of Kazan Federal University. The authors declare that they have no conflicts of interest. All the data in this study can be accessed in the supporting information.

语种：英文

外文关键词：precipitation change; microbial functional gene; nitrogen transformation; N2O; subtropical forest; field experiment

摘要：Soil nitrogen (N) loss has been predicted to intensify with increased global precipitation changes. However, the relative contributions of leaching and gaseous N emissions to intensified N losses are largely unknown. Thus, we simulated intensified precipitation seasonality in a subtropical forest by extending the dry season via rainfall exclusion and increasing the wet-season storms via irrigation without changing the total annual precipitation. Extending the dry season length increased the monthly mean soil NO3- content by 25%-64%, net N mineralization rate by 32%-40%, and net nitrification rate by 25%-28%. After adding water in the wet season, the monthly NO3- leaching was enhanced by 43% in the relatively dry year (2013, 2,094-mm annual rainfall), but reduced by 51% in the relatively wet year (2014, 1,551mm). In contrast, the monthly mean N2O emissions were reduced by 24% in 2013 but increased by 78% in 2014. Overall, the annual inorganic N content was decreased significantly by the precipitation changes. Decrease of soil inorganic N might be linked to the enhanced NO3- leaching in 2013, and be linked to the increased N2O emissions in 2014. However, in both years the annual total amount of N lost through leaching was significantly greater than that through N2O emissions. The enhanced N2O emissions driven by wet-season storms were correlated with an increase in nirS abundance. Our results suggest that increased frequency of droughts and storms will decrease soil inorganic N content in warm and humid subtropical forests mainly through enhanced leaching losses. \