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

Pedosphere 2021年第5期31卷 683-693页

作者： Yusef KIANPOOR KALKHAJEH Biao HUANG helle sorensen Peter EHOLM Hans Christian BHANSEN Anhui Province Key Laboratory of Farmland Ecological Conservation and Pollution Prevention School of Resources and EnvironmentAnhui Agricultural UniversityHefei 230036(China) Department of Plant and Environmental Sciences University of CopenhagenThorvaldsensvej 40Frederiksberg DK-1871 C(Denmark) Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008(China) Sino-Danish Center for Education and Research(SDC) Beijing 101408(China) Data Science Lab Department of Mathematical SciencesUniversity of CopenhagenUniversitetsparken 5DK-2100 Copenhagen East(Denmark)

Over-fertilization has caused significant phosphorus(P)accumulation in Chinese greenhouse vegetable production(GVP)*** 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 *** each profile,soil samples were collected at depths of 0-10(topsoil),10-20,20-40,40-60,60-80,and 80-100 *** 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 *** 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 ***,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 *** 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

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