Distribution of As Forms in Soils and Biological Effect of As on Chinese Cabbage (Brassica chinensis L.)
The distribution of As forms in yellow cinnamon soil of play pan and the relationship between As forms in soils and AEC form yellow cinnamon soil,red soil with high fertility and low paddy soil were studied,and the biological effect of As forms on Chinese cabbage was also discussed.The results showed that As forms in soils were mainly composed by fixed forms of As when As added at high rate and soil As forms were mainly composed by labile As,esp.exchangable As,when As added at low rate.The lability of soil As was improved when astragalusy (Astragalus sinicus) was added.AEC of soils was linearly positive related to labile As in soils.Soil As less than 40 mg/kg enhanced the growth of Chinese cabbage,while soil As more than 40 mg/kg inhibited the growth of Chinese cabbage.