Nutrient enrichment driven by canopy rainfall redistribution:Mechanism,quantification,and pattern  

作　　者：Chuan YUAN Xiaoping YUE Yafeng ZHANG Yu ZHANG Yanting HU Qiang TANG Li GUO Shuai WANG Xingwu DUAN Wenhua XIANG Xiaohua WEI Xiaoyan LI 

机构地区：[1]College of Forestry and Biotechnology,Zhejiang A&F University,Hangzhou 311300,China [2]Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station,School of Geographical Sciences,Southwest University,Chongqing 400715,China [3]Shapotou Desert Research and Experiment Station,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China [4]School of Geographical Sciences,Hebei Normal University,Shijiazhuang 050024,China [5]Faculty of Life Science and Technology,Central South University of Forestry and Technology,Changsha 410004,China [6]State Key Laboratory of Hydraulics and Mountain River Engineering,College of Water Resource and Hydropower,Sichuan University,Chengdu 610065,China [7]State Key Laboratory of Earth Surface Processes and Resource Ecology,Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China [8]Yunnan Key Laboratory of Soil Erosion Prevention and Green Development,Institute of International Rivers and Eco-security,Yunnan University,Kunming 650091,China [9]Department of Earth,Environmental and Geographic Sciences,University of British Columbia(Okanagan),Kelowna,British Columbia V1V 1V7,Canada

出　　处：《Science China Earth Sciences》2024年第5期1529-1544,共16页中国科学（地球科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.41901038);the Start-up Research Fund of Southwest University(Grant No.SWU-KR24003);the Open Foundation of the State Key Laboratory of Urban and Regional Ecology of China(Grant No.SKLURE2022-2-4);the Science Fund for Distinguished Young Scholars of Chongqing(Grant No.cstc2021jcyjjqX0026);the Special Fund for Youth Team of Southwest University(Grant No.SWUXDJH202306)。

摘　　要：Vegetation canopies intercept and redistribute rainfall into throughfall and stemflow,which transfer substantial amounts of elements into the soil,influencing soil microbial community,plant survival,and plant community succession.Despite advancements in ecohydrological research,the implication of nutrient enrichment resulting from this redistribution of rainfall by canopies remains largely unexplored.To address this gap,we conducted a systematic review of 1020 papers published between 2000 and 2022,gathering data on nutrient concentration and enrichment for critical ions(including K^(+),Na^(+),Ca^(2+),Mg^(2+),NH_(4)^(+),Cl^(-),NO_(3)^(-)and SO_(4)^(2-))from the Web of Science and Chinese Knowledge Infrastructure databases.We aimed to synthesize the mechanisms,quantify the enrichments,and identify global patterns of nutrient enrichment in stemflow and throughfall across climate zones,and vegetation types and ecosystems.The results of this study indicate that stemflow exhibits,on average,2.1times greater ion concentration(6.13 mg L^(-1))compared to throughfall.In particular,among the investigated ions,SO_(4)^(2-)(12.45and 6.32 mg L^(-1))for stemflow and throughfall,respectively,and Cl^(-)(9.21 and 4.81 mg L^(-1))exhibit the highest concentrations in both rainfall redistribution components,while K^(+)(13.7 and 5.8)and Mg^(2+)(5.6 and 2.8)have the highest enrichment factors.Across climate zones,throughfall and stemflow show the lowest ion concentrations but the highest enrichment factors in extremely humid regions.Along the temperature gradient,ion concentrations are the highest in cold climates with no clear patterns observed for enrichment factors with increasing temperature.In addition,shrubs,conifers,mixed forests,and artificial ecosystems demonstrate enrichment factors 1.1 to 3.0 times greater than those of trees,broad-leaved plants,pure forests,and natural ecosystems.These findings emphasize the need for increased attentions to artificial ecosystems,such as urban and agricultural ecosystems,which often received

关 键 词：ECOHYDROLOGY Rainfall redistribution Nutrients transport Enrichment characteristics Climate zones 

分 类 号：S718.5[农业科学—林学]