【作者】 罗小玲； 李淑仪； 蓝佩玲； 王荣萍； 廖新荣；

【Author】 LUO Xiao-ling~(1,2),LI Shu-yi~1,LAN Pei-ling~1,WANG Rong-ping~1,LIAO Xin-rong~1 (1 Guangdong Institute of Eco-environmental and Soil Science,Guangzhou,Guangdong,510650;2 510045)

【机构】 广东省环境保护监测中心站； 广东省生态环境与土壤研究所；

【摘要】 为保障蔬菜的品质安全,本文通过土壤盆栽试验,研究硅酸盐对Cr、Pb单一污染及Cr-Pb复合污染土壤中小白菜（Brassica Chinensis）的生物量、Cr和Pb积累量的影响。结果表明,在受到较高水平的Cr-Pb污染时,小白菜对Pb的富集能力要明显高于Cr。施用硅酸盐对减少小白菜吸收Cr、Pb效果明显,其中2.0g/kg效果最好,但该处理严重抑制小白菜生长,不适于生产应用。而Si₁处理（1.00 g/kg）能在不影响产量的前提下极显著地降低小白菜茎中Cr,Pb的质量分数,并使叶中Pb的质量分数降至国家标准限量值附近或低于限量值,因此该处理在生产上极具应用前景。更多还原

【Abstract】 The situation of soil heavy metal pollution was threatenning the quality and safety of vegetable production in Guangdong.Aiming at ensuring the safety of vegetable,pot experiments were carried out to study the effects of silicate on growth and Cr,Pb uptake of Brassica Chinensis which were growing up in Cr-Pb contaminated soil.The results indicated that,Brassica Chinensis accumulated more Pb than Cr when polluted by high density of Cr-Pb.Silicate can reduce the uptake of Cr,Pb from soil.The 2.0 g/kg silicate has the best effect, but Brassica Chinensis can’t grow normally when treated by such dose.While 1.0 g/kg silicate can reduce the uptake by stem significantly without decreasing yield.Pb in leaf can be reduced to about the standard limited value or below when treated by 1.0 g/kg silicate.This level of silicate(1.0 g/kg) is more suitable than high level (2.0 g/kg) to apply to production.更多还原