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作 者 ：黄益宗,朱永官,童依平,胡莹,刘云霞

期 刊 ：生态学报 2004年 24卷 12期 页码：2832~2836

关键词：土壤；镉；水分；玉米；吸收；

Keywords:soil, cadmium, water content, corn, absorption,

摘 要 ：采用土壤盆栽试验研究不同土壤水分含量对玉米苗期吸收积累 Cd的影响。试验结果表明 ,玉米生物量及其吸收 Cd量在玉米不同的生长时期差异较大。2 2 d收获时 ,玉米地上部和地下部生物量均随着田间持水量 (35 %～ 85 % )的增加而提高 ;而 16 d收获时 ,玉米生物量在田间持水量为 35 %和 85 %时比在其它水分时低许多。 16 d和 2 2 d收获时 ,玉米地上部 Cd含量在田间持水量 5 5 %时分别达到最大值 ,5 5 .4 1mg/ kg和 39.33mg/ kg;而在田间持水量 85 %时分别达最小值 ,2 7.97mg/ kg和 2 3.5 2 m g/kg。在玉米根系的影响下 ,土壤溶液 Cd含量基本上随着玉米的不断生长而降低。田间持水量为 6 5 %时的土壤溶液 Cd含量比田间持水量为 75 %和 85 %时大。玉米总吸 Cd量与水分蒸腾量之间呈极显著的线性正相关关系。

Abstract:Cadmium (Cd) contamination in soil has become one of the environmental issues receiving increasing attention worldwide. Cd contamination is resulted from several human economic activities: the application of municipal sewage sludge, atmospheric deposition of Cd, mining activities, application of chemical fertilizers and pesticides. Cd can be transferred to crop plants, and is often accumulated to concentrations exceeding their levels in the soil by many times. The effects of soil water contents (35%, 45%, 5...

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