重金属在土壤-植物系统的迁移、累积特征及其与土壤环境条件的关系

现场调查及试验表明,调查区土壤对Hg,Cd,Cu等金属有较强的滞留能力。重金属的迁移能力较低,集中分布在土壤表层,水平扩散范围也较小。而易呈阴离子态As的迁移能力相对较强。 在一定条件下,土壤对重金属的蓄积量有一极限值,这一数值受灌溉水浓度、灌溉量、土壤理化性质所制约。试验表明,不同理化性质的土壤对重金属的滞留量不同。 调查区植物体内重金属含量与土壤中的含量、土壤pH值、有机质、阳离子代换量、物理性粘粒含量的多元回归分析结果表明,其间呈现显著的相关关系。根据其关系式可对本区土壤污染及对植物的危害进行预测。

TRANSPORT AND ACCUMULATION OF THE HEAVY METALS IN SOIL-PLANT SYSTEM AND THE RELATION BETWEEN HEAVY METALS AND THE CONDITION OF SOIL ENVIRONMENT

The on-the-spot investigations and experiments show that the soil in the investigated area is comparatively strong in maintaining the metals such as Hg, Cd, Cu etc.The transporting capability of the heavy metals is comparatively poor. The transport distributes mainly on the surface of the soil and has a horizontal diffusion in a small range. But, the As'transporting capability in the shape of an ion is comparatively strong.On certain condition, the soil limits the accumulation of the heavy metals. The limit...