Phosphorus accumulation and leaching risk of greenhouse vegetable soils in Southeast China  

作　　者：Yusef KIANPOOR KALKHAJEH Biao HUANG Helle SORENSEN Peter EHOLM Hans Christian BHANSEN 

机构地区：[1]Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention,School of Resources and Environment,Anhui Agricultural University,Hefei 230036(China) [2]Department of Plant and Environmental Sciences,University of Copenhagen,Thorvaldsensvej 40,Frederiksberg DK-1871 C(Denmark) [3]Key Laboratory of Soil Environment and Pollution Remediation,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008(China) [4]Sino-Danish Center for Education and Research(SDC),Beijing 101408(China) [5]Data Science Lab,Department of Mathematical Sciences,University of Copenhagen,Universitetsparken 5,DK-2100 Copenhagen East(Denmark)

出　　处：《Pedosphere》2021年第5期683-693,共11页土壤圈（英文版）

基　　金：the financial support from the Sino-Danish Center for Education and Research(SDC);the financial support of the Special Research Foundation of the Public Natural Resource Management Department from the Ministry of Environmental Protection of China(No.201409044);the National Natural Science Foundation of China(No.41473073)。

摘　　要：Over-fertilization has caused significant phosphorus(P)accumulation in Chinese greenhouse vegetable production(GVP)soils.This study,for the first time,quantified profile P accumulation directly from soil P measurements,as well as subsoil P immobilization,in three alkaline coarse-textured GVP soil profiles with 5(S5),15(S15),and 30(S30)years of cultivation in Tongshan,Southeast China.For each profile,soil samples were collected at depths of 0-10(topsoil),10-20,20-40,40-60,60-80,and 80-100 cm.Phosphorus accumulation was estimated from the difference in P contents between topsoil and parent material(60-100 cm subsoil).Phosphorus mobility was assessed from measurements of water-soluble P concentration(P_(Sol)).Finally,P sorption isotherms were produced using a batch sorption experiment and fitted using a modified Langmuir model.High total P contents of 1980(S5),3190(S15),and 2330(S30)mg kg^(-1) were measured in the topsoils versus lower total P content of approximately 600 mg kg^(-1) in the 80-100 cm subsoils.Likewise,topsoil PSol values were very high,varying from 6.4 to 17.0 mg L^(-1).The estimated annual P accumulations in the topsoils were 397(S5),212(S15),and 78(S30)kg ha^(-1) year^(-1).Sorption isotherms demonstrated the dominance of P desorption in highly P-saturated topsoils,whereas the amount of adsorbed P increased in the 80-100 cm subsoils with slightly larger P adsorption capacity.The total P adsorption capacity of the 80-100 cm subsoils at a solution P concentration of0.5 mg L^(-1) was 15.7(S5),8.7(S15),and 6.5(S30)kg ha^(-1),demonstrating that subsoils were unable to secure P concentrations in leaching water below 0.5 mg L^(-1) because of their insufficient P-binding capacity.

关 键 词：greenhouse vegetable production Langmuir model P adsorption capacity P desorption P immobilization P mobility SUBSOIL TOPSOIL 

分 类 号：X53[环境科学与工程—环境工程]