重金属在土壤——水稻系统中的迁移转化规律研究

Transport and transformation of heavy metals in the soil-paddy plant system

重金属在土壤—水稻系统中的迁移转化,受其在水稻土中的形态分布、土壤理化性质、有机物料和微量或大量元素的交互作用影响,以及其在水稻根际环境中的形态转化条件制约。重金属在水稻植株中的分布、迁移和总量传输,是一个动态过程。不同重金属处理水平、不同生长期水稻的不同器官的重金属含量不一,从土壤和根部传输上来的重金属会逐渐积累。

Transport and transformation of heavy metals in the soil-paddy plant system are influenced by the distribution of their forms in paddy soil, physical-chemical properties of soil and interaction between organic materials and trace elements or major elements and constrained by condition of their form transformation in the paddy rhizosphere. The transport and distribution of heavy metals in paddy plants is a dynamic process. The concentration order of heavy metals in different parts of paddy plants is root>ground-stem>stem>fringe>grain>leaf, and their concentrations vary with different growth times of paddy plants and different processing levels of heavy metals.