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Food Hygienic Standard Based Cd Threshold Value of Fluvo-aquic Soils in Tianjin for Rice Production
Author(s): 
Pages: 220-224
Year: Issue:  2
Journal: Journal of Ecology and Rural Environment

Keyword:  水稻 Cd 糙米 全量 有效态 临界值;
Abstract: 以籽粒Cd富集能力不同的两个基因型水稻为材料,通过盆栽试验研究水稻地上部对Cd的积累特征及其产地土壤Cd临界值。结果表明,土壤Cd添加量为0~1.5 mg.kg-1时,其对水稻生长和产量无明显抑制效应,两个基因型水稻的生长和Cd富集能力也无显著差异。水稻地上部对Cd的富集量由高到低依次为茎秆、叶、糙米和稻壳,但土壤Cd全量、CaCl2提取态Cd与糙米Cd含量之间均呈显著正相关。依据GB 2762—2005《食品中污染物限量》中大米Cd限量值及糙米的Cd累积特征,反推得到天津潮土(pH值为7.71)Cd全量临界值为2.1 mg.kg-1,CaCl2提取态Cd临界值为5.7μg.kg-1(基于Cd高积累型水稻)。该研究结果可为GB 15618—1995《土壤环境质量标准》的修订及农产品产地适宜性评价提供基础数据。
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