【摘要】 模拟镉污染土壤作幼苗试验,土壤镉污染量超过133μg/g土时,结球甘兰(Brassi-ca Oleracea var.Capitata)幼苗出现明显镉毒害。幼苗含镉量和土壤全镉、0.1N盐酸提取镉、PH7.3DTPA提取镉、1N中性醋酸铵提取镉都是显著相关。镉污染量在幼苗出现毒害范围,土壤有效镉的“活度”更大。土壤有效镉的形态主要是交换态镉和络合态镉。土壤镉含量低于33.3μg/g土时以络态合镉为主,高于66.7μg/g土时以交换态镉为主。更多还原

【Abstract】 Doing seedling testing with the simulated soil pollution by cadium, when the concentration of cadium in soil was higher than 133μg/g dry soil, the. seedling of cabbage (Brassica oleracea var.capitata)were poisoned obviously.The content of cadium in plant was correlated significantly with all the total cadium in soil,the amount of cadium extracted by 0.1N HC1, by DTPA (PH7.3) or by 1NCH3 COONH4,. When the amount of cadium in soil was higher than the critical value tolerable for seedling, the activity of available cadium in soil was more greater.The main forms of cadium in polluted soil were the exchangeable cadium and the complex cadium. When the total cadium was lower than 33.3μg/g dry soil the complex cadium was the dominant form, otherwise, when the total cadium was higher than 66.7μg/g dry soil,the exchangeable was the dominant.更多还原