摘要
重金属Ｃｄ和Ｚｎ作为复合体对土壤－水稻系统的污染时有发生，为此，作者采用盆栽试验方法对这一重要问题作了深入细致的研究。结果表明，Ｃｄ－Ｚｎ作为复合体和Ｃｄ（或Ｚｎ）作为单体对土壤－水稻系统的污染之间有着一定的差异，它具体表现在对水稻生物产量和糙米中Ｃｄ与Ｚｎ的浓度的影响以及水稻生物产量与糙米Ｚｎ／Ｃｄ比值的指数对数值之间的相关程度等三个方面，并由此推导出衡量土壤－水稻系统Ｃｄ－Ｚｎ复合污染发生及其严重程度的简化数学模型。应用这一数学模型计算表明，在Ｃｄ－Ｚｎ复合污染发生的盆栽试验条件下土壤Ｃｄ和Ｚｎ的最大允许浓度分别依次为１．０和４００ｍｇ／ｋｇ，这可以作为棕壤性水稻土Ｃｄ和Ｚｎ环境质量标准制定的依据。
A study on the soil-rice system pollution
by the Cd-Zn mixture in nature wasconducted using the pot-culture method. There existed some
differences between theCd-Zn combined pollution and single-factor pollution of Cd (or Zn) in the
soil-ricesystems. The differences included changes in the biological yield of rice and
theconcentrations of Cd and Zn in brown rice and relationship between biological yieldof rice
and Zn/Cd ratios of brown rice. According to the conclusion, a mathema-tical model for
weighting combined pollution of Cd and Zn in soil-rice systems wasdeduced. The calculation
results obtained by applying the niodel showed that themaximum allowable concentrations of
Cd and Zn in the soil under the combined-poilution condition were 1.0 and 400mg/kg,
respectively. This provided a basis forworking out the soil-environmental quality standards for
Cd and Zn.
出处
《土壤学报》
CAS
CSCD
北大核心
1995年第4期430-436,共7页
Acta Pedologica Sinica
关键词
土壤
水稻
复合体
污染
镉
锌
Soil-rice system,Cd-Zn mixture, Pollution
