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首页> 外文期刊>Plant and Soil >Cadmium and zinc in plants and soil solutions from contaminated soils.
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Cadmium and zinc in plants and soil solutions from contaminated soils.

机译：污染土壤中植物和土壤溶液中的镉和锌。

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In an experiment using ten heavy metal-contaminated arable or grassland soils from six European countries, soil solution was sampled by water displacement before and after the growth of radishes cv. Crystal Ball. Concentrations of Cd, Zn and other elements in solution (K, Ca, Mg, Mn) generally decreased during plant growth, probably because of uptake by plants and the subsequent redistribution of ions onto soil exchange sites at lower ionic strength. Speciation analysis by a resin exchange method showed that most Cd and Zn in non-rhizosphere solutions was present as Cd2+ and Zn2+, respectively. The proportion of free ions was slightly lower in rhizosphere solutions, mainly due to an increase in dissolved organic carbon during plant growth. Solution pH increased during plant growth, although the bulk soil pH generally remained constant. Cd concentrations in leaves and tubers were more closely correlated with their total or free ionic concentrations in rhizosphere solutions (adjusted R2 ?0.90) than with their concentrations in soils (adj. R2 ?0.79). Cd concentrations in non-rhizosphere solutions were only poorly correlated with Cd concentrations in leaves and tubers. In contrast to Cd, there were no soil parameters that individually predicted Znconcentrations in leaves and tubers closely. However, multiple correlation analysis (including Zn concentrations in rhizosphere solutions and in bulk soils) closely predicted Zn concentrations in leaves and tubers (adj. R2 = 0.85 and 0.70, respectively). This suggests that the great variability among soils in the solubility of Zn affected the rate of release of Zn into solution, and thus Zn uptake. There was no such effect for Cd, for which solubility varied much less. Furthermore, the plants may havepartly controlled Zn uptake, as they took up relatively less at high solution concentrations of Zn. Free ionic concentrations in soil solution did not predict concentrations of Cd or Zn in plants better than their total concentrations in solution. This suggests that with these soils, analysis of Cd and Zn speciation is of little practical importance when their bioavailability is assessed.
机译：在一项使用来自六个欧洲国家的十种重金属污染的耕地或草原土壤进行的实验中，通过萝卜cv生长前后的水置换对土壤溶液进行了采样。水晶球。在植物生长过程中，溶液中的镉，锌和其他元素（钾，钙，镁，锰）的浓度通常会降低，这可能是由于植物对植物的吸收以及随后离子在较低离子强度下重新分布到土壤交换位点上的缘故。通过树脂交换法进行的形态分析表明，非根际溶液中的大多数Cd和Zn分别以Cd2 +和Zn2 +的形式存在。根际溶液中游离离子的比例略低，这主要是由于植物生长过程中溶解有机碳的增加。尽管总体土壤pH通常保持恒定，但溶液pH在植物生长过程中会增加。叶片和块茎中Cd的浓度与其在根际溶液中的总离子浓度或游离离子浓度（调整后的R2≤0.90）的关系比与土壤中的总Cd浓度或游离离子的浓度（adjust。R2≤0.79）的关系更密切。非根际溶液中的Cd浓度仅与叶和块茎中的Cd浓度相关。与Cd相反，没有土壤参数可以单独预测叶片和块茎中的Zn浓度。然而，多重相关分析（包括根际溶液和块状土壤中的锌浓度）紧密预测了叶和块茎中的锌浓度（分别为R2 = 0.85和0.70）。这表明土壤中锌溶解度的巨大差异会影响锌向溶液中的释放速率，从而影响锌的吸收。对于Cd而言，没有这样的影响，因为Cd的溶解度变化很小。此外，植物可能已部分控制了锌的吸收，因为它们在高溶液浓度的Zn下吸收相对较少。土壤溶液中的游离离子浓度不能预测植物中Cd或Zn的浓度优于其溶液中的总浓度。这表明，对于这些土壤，评估其生物利用度时，分析Cd和Zn形态几乎没有实际意义。

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