In pot experiments , earthworms and fresh straw were added into gray desert soil with different concentra- tions of Cd pollution to study the rape (Brassica rapa L . Spp . Chinenesis ) Cd accumulation in the soil system under two treatments : earthworm and straw additions . The results showed that : (1) Under different conditions of soil Cd~pollution , the addition of earthworms can effectively promote Cd in the soil to transfer into rape ; earthworms can survive in the Cd~~ contaminated soil, while with the increase of Cd in the environment , Cd concentration in earthworm bodies increase too . (2 ) In the rape~soil system , addition of different proportions of straw into soil can promote Cd to transfer into rape bodies and rhizosphere soil, and the promotion effects are soil:straw = 1: 1> soil: straw = 2: 1> soil: straw = 1: 0 ; in the soil with same Cd concentration , Cd content in rape>Cd content in rhizosphere soil>Cd content in soil, which indicates that application of straw can effectively promote the accumulation of Cd in rape .%采用盆栽试验,在不同镉(Cd)污染浓度的灰漠土中分别添加蚯蚓和新鲜秸秆,研究了添加蚯蚓和秸秆还田条件下油菜(Brassica rapa L.spp.Chinenesis)-土壤体系中Cd的分布情况.结果发现:(1)添蚯蚓可有效增加土壤中Cd向油菜体内转移;蚯蚓可以在Cd污染的土壤中生存,蚯蚓体内Cd浓度随土壤环境中Cd的增加而增加.(2)添加不同比例的秸秆,可促进土壤Cd向油菜体内和根际土壤中转移,促进效果为土壤:秸秆=1:1＞土壤:秸秆＝2:1＞土壤:秸秆=1:0;在相同Cd浓度土壤中,油菜中Cd含量＞根际土中Cd含量＞土壤中的Cd含量,说明施加秸秆可有效促进油菜对Cd的积累.
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