Transport of phosphorus in runoff and sediment with surface runoff from bare purple soil during indoor simulated rainfall  

作　　者：MA Xiao YANG Jie ZHOU Xiang-jun WU Hong-tao XIONG Qiao LI Ye 

机构地区：[1]College of Urban and Environmental Sciences,Hubei Normal University,Huangshi 435002,China [2]Hubei Key Laboratory of Pollutant Analysis&Reuse Technology,Hubei Key Research Institute of Humanities&Social Science,Huangshi 435002,China [3]School of Resource and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China

出　　处：《Journal of Mountain Science》2022年第8期2333-2345,共13页山地科学学报（英文）

基　　金：jointly supported by the National Natural Science Foundation,China(41907124,3210130653,51908233);Program for Innovative Research Team of Excellent Middle-Aged and Young in Higher Education Institutions of Hubei Province(T2021011);Nature Science Foundation of Hubei Province,China(2020CFB465);Educational Commission of Hubei Province,China(D20202503);Open Fund of Research Center for Transition and Development of Resources-exhausted City,China(KF2020Z03)。

摘　　要：Phosphorus(P)in surface runoff from purple soil is a critical element of agricultural nonpoint source pollution,leading to eutrophication of surface waters in the Three Gorges Reservoir Area(TGRA)of China.This work aimed to understand the processes and mechanisms of P losses from bare purple soil.Based on an indoor rainfall simulation experiment,we focused on the processes of surface runoff and P losses via different hydrological pathways.Experimental treatments included three simulated rainfall intensities,four slope gradients,and three fertilizer treatments.P loss from sediment was the main pathway in the purple soil,and bioavailable P was mainly transferred in dissolved P(DP)of runoff water.The P loss loads tend to grow with the increase of the slope until 25°for the maximum load of runoff water and 20°for the maximum load of sediment.Concentrations of DP in the surface runoff after fertilizer application can exceed the estimates of those required for accelerated eutrophication.Sediment P control might be an essential way for reducing P loss in purple soil for the local government and farmers of TGRA.

关 键 词：Surface runoff Sediment yield Phosphorus loss Purple soil Simulated rainfall 

分 类 号：X71[环境科学与工程—环境工程] X52