文献类型：期刊文献

英文题名：Nitrogen and phosphorus additions alter soil N transformations in a Metasequoia glyptostroboides plantation

作者：Zhang, Youzheng[1] Jiang, Pengcheng[2] Guo, Yaolin[3] Wu, Ming[2] Shao, Xuexin[2] Xu, Hengtao[1] Wu, Tonggui[2] Yuan, Wenwen[2] Li, Niu[2]

第一作者：Zhang, Youzheng

通信作者：Yuan, WW[1];Li, N[1]

机构：[1]Minist Nat Resources, Inst Oceanog 2, Key Lab Engn Oceanog, Key Lab Nearshore Engn Environm & Ecol Secur Zheji, Hangzhou, Peoples R China;[2]Chinese Acad Forestry, Res Inst Subtrop Forestry, Wetland Ecosyst Res Stn Hangzhou Bay, Hangzhou, Peoples R China;[3]Fudan Univ, Sch Life Sci, Shanghai, Peoples R China

年份：2024

卷号：15

外文期刊名：FRONTIERS IN PLANT SCIENCE

收录：;Scopus(收录号：2-s2.0-85203535756);WOS:【SCI-EXPANDED(收录号:WOS:001308131300001)】；

基金：No Statement Available

语种：英文

外文关键词：Metasequoia glyptostroboides; nutrient enrichment; nitrification; denitrification; ammonia-oxidizing bacteria

摘要：Introduction Nitrogen (N) and phosphorus (P) enrichment due to anthropogenic activities can significantly affect soil N transformations in forest ecosystems. However, the effects of N and P additions on nitrification and denitrification processes in Metasequoia glyptostroboides plantations, and economically important forest type in China, remain poorly understood.Methods This study investigated the responses of soil nitrification and denitrification rates, as well as the abundances of nitrifiers and denitrifiers, to different levels of N and P additions in a 6-year nutrient addition experiment in a M. glyptostroboides plantation.Results Stepwise multiple regression analysis was used to identify the main predictors of nitrification and denitrification rates. The results showed that moderate N addition (N2 treatment, 2.4 molm-2) stimulated nitrification rates and abundances of ammonia-oxidizing archaea (AOA) and bacteria (AOB), while excessive N and P additions inhibited denitrification rates and reduced the abundance of nirS-type denitrifiers. AOB abundance was the main predictor of nitrification rates under N additions, whereas microbial biomass carbon and nirS gene abundance were the key factors controlling denitrification rates. Under P additions, tree growth parameters (diameter at breast height and crown base height) and AOB abundance were the primary predictors of nitrification and denitrification rates.Discussion Our study reveals complex interactions among nutrient inputs, plant growth, soil properties, and microbial communities in regulating soil N transformations in plantation forests. This study also offers valuable insights for formulating effective nutrient management strategies to enhance the growth and health of M. glyptostroboides plantations under scenarios of increasing elevated nutrient deposition.