【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。更多还原

【Abstract】 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 NH₄ 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）。更多还原