文献类型：期刊文献

英文题名：Differential responses of net N mineralization and nitrification to throughfall reduction in a Castanopsis hystrix plantation in southern China

作者：Chen, Lin[1,2,3] Wen, Yuanguang[1,4] Zeng, Ji[2] Wang, Hui[5] Wang, Jingxin[6] Dell, Bernard[5,7] Liu, Shirong[1,5]

第一作者：陈琳;Chen, Lin

通信作者：Liu, SR[1];Liu, SR[2]

机构：[1]Guangxi Univ, Coll Forestry, Nanning 530004, Peoples R China;[2]Chinese Acad Forestry, Expt Ctr Trop Forestry, Pingxiang 532600, Guangxi, Peoples R China;[3]Youyiguan Forest Ecosyst Res Stn, Pingxiang 532600, Guangxi, Peoples R China;[4]Guangxi Univ, Guangxi Key Lab Forest Ecol & Conservat, Nanning 530004, Peoples R China;[5]Chinese Acad Forestry, Inst Forest Ecol Environm & Protect, Beijing 100091, Peoples R China;[6]West Virginia Univ, Div Forestry & Nat Resources, Morgantown, WV 26506 USA;[7]Murdoch Univ, Sch Vet & Life Sci, Murdoch, WA 6150, Australia

年份：2019

卷号：6

期号：1

外文期刊名：FOREST ECOSYSTEMS

收录：;Scopus(收录号：2-s2.0-85066306157);WOS:【SCI-EXPANDED(收录号:WOS:000467636000001)】；

基金：This research was jointly funded by the National Natural Science Foundation of China (31290223, 31800533) and Central Research Institute of Basic Research and Public Service Special Operations, Chinese Academy of Forestry (CAFYBB2017QA026), playing the role in the collection, analysis, and interpretation of data; Ministry of Science and Technology of the People's Republic of China (2015DFA31440, 2018YFC0507300) in writing the manuscript.

语种：英文

外文关键词：Castanopsis hystrix; Throughfall reduction; Microbial biomass; Microbial community composition; Net nitrogen mineralization

摘要：Background: Many regions in the world are experiencing changes in precipitation pattern, which likely impact soil nitrogen cycling and availability. However, we know little about how soil nitrogen processes respond to drought stress under climate change. Methods: A continuous 5-year experiment of throughfall reduction treatment (TRT) was conducted in a Castanopsis hystrix plantation in subtropical China to assess how soil nitrogen processes responded to a change in precipitation. Net nitrogen transformation, soil properties, microbial biomass carbon (MBC) and nitrogen (MBN), and microbial community phospholipid fatty acids (PLFAs as bacteria, fungi and arbuscular mycorrhizal fungi (AMF)) were investigated in the wet and dry seasons over the period of the manipulation experiment. Results: TRT had no significant effects on net ammonification rate (NAR) and nitrogen mineralization rate (NMR), and the unchanged NAR and NMR were mainly caused by the no change of soil nitrogen availability (i.e. NH4+-N, NO3--N and dissolved organic nitrogen). However, TRT significantly increased net nitrification rate (NNR) in the wet season primarily due to the increase in NO3- concentration, and might be further caused by reduced NO3 leaching, denitrification or NO3--N uptake in the TRT. Differently, TRT significantly decreased the NNR in the dry season, which might be linked to the limited SWC that resulted in greater microbial nitrate immobilization than gross nitrate mineralization. In addition, TRT significantly influenced the soil microbial community composition in 010 cm soil layer in the wet season, primarily due to the variations in NO3--N, DOC and DON. Conclusions: Precipitation reduction affected the NNR rather than NAR and NMR, and consequently, further affected soil N availability and N uptake by Castanopsis hystrix.