Effects of nitrogen enrichment on soil enzyme activities in grassland ecosystems in China:A multilevel meta-analysis  

作　　者：Jibo SHI Muhammad KHASHI U RAHMAN Ruonan MA Qiang LI Yingxin HUANG Guangdi LI 

机构地区：[1]Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130102,China [2]Jilin Provincial Key Laboratory of Grassland Farming,Changchun 130102,China [3]Key Laboratory of Mollisols Agroecology,Chinese Academy of Sciences,Changchun 130102,China [4]Microbiology and Genetics Department&Institute for Agribiotechnology Research(CIALE),University of Salamanca,Salamanca 37007,Spain [5]University of Chinese Academy of Sciences,Beijing 100049,China [6]New South Wales Department of Primary Industries,Wagga Wagga Agricultural Institute,Wagga Wagga 2650,Australia

出　　处：《Pedosphere》2025年第1期84-96,共13页土壤圈(英文版)

基　　金：supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA28110300);National Natural Science Foundation of China(No.U23A2004);Natural Science Foundation of Jilin Province,China(No.YDZJ202201ZYTS522);Science and Technology Cooperation Program between Jilin Province and Chinese Academy of Sciences(No.2023SYHZ0053);Innovation Team Program of Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences(No.2023CXTD02);the European Commission under Marie Sk?odowska-Curie(No.101034371)。

摘　　要：Nitrogen(N)enrichment has resulted in widespread alteration of grassland ecosystem processes and functions mainly through disturbance in soil enzyme activities.However,we lack a comprehensive understanding of how N deposition affects specific key soil enzymes that mediate plant-soil feedback of grassland.Here,with a meta-analysis on 1446 cases from field observations in China,we show that N deposition differently affects soil enzymes associated with soil biochemical processes.Specifically,N-promoted C,N,and P-acquiring hydrolase activities significantly increased by 8.73%,7.67%,and 8.69%,respectively,related to an increase in microbial-specific enzyme secretion.The increased relative N availability and soil acidification were two potential mechanisms accounting for the changes in soil enzyme activities with N enrichment.The mixed N addition in combination of NH_(4)NO_(3) and urea showed greater stimulation effect on soil enzyme activities.However,the high rate and long-term N addition tended to weaken the positive responses of soil C-,Nand P-acquiring hydrolase activities to N enrichment.Spatially increased mean annual precipitation and temperature primarily promoted the positive effects of N enrichment on N-and P-acquiring hydrolase activities,and the stimulation of C-and N-acquiring hydrolase activities by N enrichment was intensified with the increase in soil depth.Finally,multimodal inference showed that grassland type was the most important regulator of responses of microbial C,N,and P-acquiring hydrolase activities to N enrichment.This meta-analysis provides a comprehensive insight into understanding the key role of N enrichment in shaping soil enzyme activities of grassland ecosystems.

关 键 词：C N and P-acquiring hydrolases grassland type model selection N addition OXIDASE soil acidification 

分 类 号：S15[农业科学—土壤学]