Abstract
In this paper, it gives research on annual net flux and accumulative amount of the soil heavy mental in the Pearl River Basin on the basis of giving full consideration to environment law, by adopting such methods as theoretical calculation and field test and based on input/output flux model of soil chemical quality evaluation, and it gives heavy metal content warning and rating to paddy field, dry land and orchard in the Pearl River Basin based on heavy metal chemical evaluation warning method. The research conclusion indicates that: the main heavy metal pollution elements of paddy field and dry land in the Pearl River Basin are Cd, Ni and Hg; heavy metal pollution elements of orchard soil are As, Cr and Ni. Soil of the paddy field, dry land and orchard surrounding Guangzhou city is polluted more seriously; soil of the paddy field and dry land surrounding Jiangmen city and Zhongshan city is given severe pollution warning; soil of the paddy field, dry land and orchard surrounding Zhuhai and Zhaoqing is polluted slightly. Soil quality can be evaluated better by utilizing the input/output flux model for soil chemical quality evaluation proposed in this paper.
