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出 处:《农业环境科学学报》2005年第4期674-677,共4页Journal of Agro-Environment Science
基 金:上海市高等学校青年基金(01-QN-68); 上海市教委重点学科建设基金(G642)
摘 要:采用60d温室盆栽试验研究了蓖麻对土壤中重金属Cd污染的耐性和积累效应。结果表示,在40mg·kg^(-1)的Cd处理浓度时,蓖麻的株高以及根、茎、叶的干物重达到最大,但是随着Cd处理浓度的增加,蓖麻生长缓慢,植株矮小,并从Cd处理浓度200mg·kg^(-1)开始出现较明显的叶片黄化等重金属中毒症状,当Cd处理浓度达到400mg·kg-1时仍能生长,表现出较强的耐性。说明低浓度的Cd对蓖麻生长有一定促进作用,高浓度的Cd抑制蓖麻的生长。蓖麻对Cd的积累主要集中在根部,积累浓度为根>茎>叶,这可能与蓖麻具有强大的根系有关。蓖麻根系对Cd的积累在土壤Cd处理浓度为200mg·kg^(-1)时显著上升,并在Cd处理浓度为360mg·kg^(-1)时最大,积累量达到4460.3mg·kg^(-1);蓖麻地上部叶和茎对Cd的积累分别在Cd处理浓度320mg·kg^(-1)和360mg·kg^(-1)时达到最大,其中茎对Cd的最大积累量达到137.1mg·kg^(-1)。蓖麻对修复Cd污染土壤有一定的潜力。A pot experiment with Ricinus communis L. growing on soils added with 0~400mg·kg^-1 Cd was conducted to study the tolerance, uptake and accumulation of Cd by Ricinus communis L. and its potential for phytoremediation of Cd contaminated soil. After growing 60 days, it was found that the plant height and the dry matter yields of roots, stems and leaves reached the peak at the Cd concentration of 40 mg. kg^-1 in soil. The plants grew more slowly with increasing Cd concentration in soil and the leaves turned yellow gradually when the Cd concentration in soil were more than 200 mg·kg^-1, but it could stillgrow in the soil with Cd concentration up to 400mg·kg^-1. We concluded that low concentration of Cd could accelerate the growth of Ricinus communis L. to some extent and high concentration of Cd restrained the growth of Ricinus communis L., but Ricinus communis L. showed the tolerance to high Cd contamination in soil. The uptake and accumulation of Cd concentration in roots was much higher than that in stems and leaves, which partially related to the strong root system of Ricinus communis L.. The Cd concentration in roots increased obviously when Cd addition in soil was 200 mg· kg^-1, and then peaked at 4 460.3mg·kg^-1 in plant's roots when adding Cd 360mg·kg^-1 in soil, while Cd concentration in plant's leaves and stems reached their peaks of 22.5mg·kg^-1 and 137.1mg·kg^-1 with Cd addition of 320mg·kg^-1 and 360mg·kg^-1 in soil, respectively. The resuits suggested that Ricinus communis L. appeared a Cd accumulator, making it suitable for phytoremediation for Cd contaminated soil.
分 类 号:X171.5[环境科学与工程—环境科学]
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