%0 Journal Article
%T Phosphorus leaching change point of subtropical variable-charge soils and its relations with soil properties<br>亚热带可变电荷土壤磷素淋失临界点及其与土壤特性的关系
%A NIE Min
%A XIAO Heai
%A LIAO Dunxiu
%A GAO Ru
%A GE Tid
%A LI Yuyuan
%A WU Jinshui
%A <br>聂敏
%A 肖和艾
%A 廖敦秀
%A 高茹
%A 葛体达
%A 李裕元
%A 吴金水
%J 环境科学学报
%D 2013
%I 
%X This study was to understand the characteristics of the P leaching potential of variable-charge soils and to evaluate their P leaching risks.Sixteen soils which were representatives of variable-charge soils in subtropical China, as determined by their phosphorus (P) leaching change point (the soil P concentration where P moves from soil to water), were collected.Basic properties e.g.pH, CEC, clay and organic matter, exchangeable Ca2+ and Mg2+, Fe2O3 and Al2O3 concentrations were determined.There were large variations in Olsen P concentrations (56~123 mg·kg-1) at the P leaching change points.The Olsen P concentrations of upland soils were mainly quite small (< 60 mg·kg-1) and were considerably higher in paddy soils (> 80 mg·kg-1).Therefore the P leaching potential was lower in the paddy soils than in the upland soils.Principal Component Analysis indicated that soil chemical properties can produce both positive and negative effects on Olsen P concentration.This explains why linear correlations between Olsen P concentrations and single soil chemical properties are generally non-significant. Such analyses cannot realistically reflect the effects of pH, CEC, and the concentrations of clay, exchangeable Ca2+ and Mg2+ (no significant correlations), and even give contradictory results with Fe2O3 and Al2O3 (negative correlations).Olsen P concentrations at the change points of the variable charge soils were higher than the commonly measured in permanent-charge soils.Because the Olsen-P concentrations in all of the variable charge soils were considerably less than the Olsen P concentrations at the change point, it is suggested that potential risks of P leaching from variable-charge soils are small in subtropical China.
%K variable-charge soils
%K P leaching change point
%K soil parameters
%K P leaching risks<br>可变电荷土壤
%K P淋失临界点
%K 土壤理化性质
%K P淋失风险
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3ff3aba7486768130c3ff830376f43b398e0c97f0ff2dd53&cid=a7ca601309f5fed03c078bce383971dc&jid=03a55e61a8750acac6af81ef9e2ac838&aid=9c65539b20e123fcaaf6ddf0b64da7a2&yid=ff7aa908d58e97fa&vid=27746bceee58e9dc&iid=0b39a22176ce99fb&sid=57ea20f731155703&eid=cd26609c367ac9c8&journal_id=0253-2468&journal_name=环境科学学报&referenced_num=0&reference_num=40