土壤中铬的有效性与污染生态效应  

Cr AVAILABILITY IN SOILS AND ITS EFFECTS ON POLLUTION ECOLOGY

作　　者：陈英旭[1] 朱祖祥[1] 何增耀[1] 

机构地区：[1]浙江农业大学环保系

出　　处：《生态学报》1995年第1期79-84,共6页Acta Ecologica Sinica

基　　金：国家自然科学基金;中国科学院土壤圈物质循环开放实验室资助

摘　　要：本文研究了土壤中铬的有效性及其对水稻生长发育和吸收积累的影响，结果表明：０．０５ｍｏｌ／ＬＥＤＴＡ是土壤中有效态铬的较好提取剂；添加无机态Ｃｒ（Ⅲ）、Ｃｒ（Ⅵ）的盆栽土壤中有效态铬随时间延长而降低，在低添加浓度下，水稻根系中铬浓度随生长时间延长而增高，茎叶中铬含量则相反，铬对水稻的毒性和吸收积累明显受土壤性质的影响。r availability in soils and Cr uptake and accumulation by rice were studied. Theamounts of Cr extracted with various extractants followed the order :.1mol/L HCl>0.05mol/L EDTA>0.005mol/LDTPA, 1mol/L NH_4 Ac, Under the condition of simulatedpot culture, Cr content in rice grain was positively correlated to be the amount of Cr extract-ed with 0.05mol/LEDTA, but was not correlated to the amounts of Cr extracted with otherthree extractants.0.05mol/LEDTA was proposed to the best extractant for available Cr, The amount of available Cr was small as compared with total Cr content in soils.Theamount of available Cr in high Cr concentration treated soils decreased very fast.In general,with time of rice growth in Cr tredted soils,Cr content in root increased and that in stemsand leaves decreased. Cr(Ⅵ)in high pH soils was more harmful to rice than that in low pHsoils。 Cr(Ⅲ)in low pH soils was more harmful to rice than that in high pH soils.The uptakeof Cr(Ⅵ)by rice was larger than that of Cr(Ⅲ)。

关 键 词：铬 有效态 土壤 污染 生态效应 生态学 

分 类 号：S154.1[农业科学—土壤学] X171[农业科学—农业基础科学]