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作 者 ：王寿祥,张永熙,胡秉民,黄丹

期 刊 ：生态学报 1992年 12卷 4期 页码：310~315

关键词：放射生态学；放射性锶；同位素示踪；数学模型；水稻田；

Keywords:radioecology, active strontium, isotope tracer, mathematical model, paddy.,

摘 要 ：采用模拟污染物的同位素示踪技术探索了~(89)Sr在水稻-田水-土壤系统中的消长与分配,并建立了其行为规律的数学模型。结果表明,田表水中~(89)Sr-Sr含量迅速地降低,1d后由原始量的8.5μg/g降为4.0μg/g,以后逐渐降低,至试验结束(28d)时为0.7μg/g;表土中~(89)Sr-Sr含量迅速地增大,1d后即由0达12.4μg/g,试验结束时为20.9μg/g;水稻地上部,1d后由0达8.8μg/g,以后也呈增加趋势,结束时达21.7μg/g,水稻根由1d的9.5μg/g达试验结束时的39.6μg/g,田表水、表土用水稻植株中~(89)Sr-Sr含量随时间变化的规律相应为. 其次,在收获期,糙米中~(89)Sr-Sr含量为1.6μg/g,稻壳为9.4μg/g,稻草为39.7μg/g,稻根为41.8μg/g。还测定了~(89)Sr-Sr在收获期土壤中的铅垂分布,表明,58.2％的~(89)Sr-Sr滞留于表层2cm,并且其滞留量随土壤深度按指数规律衰减:

Abstract:The isotope tracer techniques for simulated pollutants are applied to explore the accumulation-disappearance and distribution of strontium-89 in the rice-paddy water-soil system,and the mathematical model of the behaviour law was built. The results showed that the content of 89Sr-Sr in paddy water was reduced quickly, after the first day reduced from initial 8.5μg/g to 4.0 μg/g and afterwords reduced gradually. When the test ended (28 days), it was 0.7(μg/g. The content of 89Sr-Sr was increased quickly in t...

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