文献类型：期刊文献

英文题名：Long-term phosphorus addition alters plant community composition but not ecosystem stability of a nitrogen-enriched desert steppe

作者：Fang, Zhao[1,2,3,4] Yu, Hailong[5] Li, Chunhuan[5] Wang, Bin[6] Jiao, Feng[1,4] Huang, Juying[1,2,3]

第一作者：Fang, Zhao

通信作者：Jiao, F[1];Huang, JY[1]

机构：[1]Breeding Base State Key Lab Land Degradat & Ecol R, Yinchuan 750021, Peoples R China;[2]Minist Educ, Key Lab Restorat & Reconstruct Degraded Ecosyst No, Yinchuan 750021, Peoples R China;[3]Ningxia Univ, Sch Ecol & Environm, Yinchuan 750021, Peoples R China;[4]Northwest A&F Univ, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China;[5]Ningxia Univ, Sch Geog & Planning, Yinchuan 750021, Peoples R China;[6]Chinese Acad Forestry, Res Inst Subtrop Forestry, Fuyang 311400, Peoples R China

年份：2023

卷号：879

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20231413854927);Scopus(收录号：2-s2.0-85151514071);WOS:【SCI-EXPANDED(收录号:WOS:000974869300001)】；

基金：This research was fi nancially supported jointly by the Natural Science Foundation of Ningxia (2022AAC02012) and the National Natural Science Foundation of China (32160277 and 41961001) .

语种：英文

外文关键词：Desert steppe; Dominant species stability; Species asynchrony; Species diversity; Population stability; Nitrogen and phosphorus additions

摘要：Under ongoing global change, whether grassland ecosystems can maintain their functions and services depends largely on their stability. However, how ecosystem stability responds to increasing phosphorus (P) inputs under nitrogen (N) loading remains unclear. We conducted a 7-year field experiment to examine the influence of elevated P inputs (ranging from 0 to 16 g P m-2 yr-1) on the temporal stability of aboveground net primary productivity (ANPP) under N addition of 5 g N center dot m-2 center dot yr-1 in a desert steppe. We found that under N loading, P addition altered plant com-munity composition but did not significantly affect ecosystem stability. Specifically, with the increase in the P addition rate, declines in the relative ANPP of legume could be compensated for by an increase in the relative ANPP of grass and forb species, yet community ANPP and diversity remained unchanged. Notably, the stability and asynchrony of dom-inant species tended to decrease with increasing P addition, and a significant decrease in legume stability was observed at high P rates (>8 g P m-2 yr-1). Moreover, P addition indirectly affected ecosystem stability by multiple pathways (e.g., species diversity, species asynchrony, dominant species asynchrony, and dominant species stability), as revealed by structural equation modeling results. Our results suggest that multiple mechanisms work concurrently in stabilizing the ecosystem stability of desert steppes and that increasing P inputs may not alter desert steppe ecosystem stability under future N-enriched scenarios. Our results will help improve the accuracy of vegetation dynamics assessments in arid ecosystems under future global change.