Form and Distribution of Exogenous Pb in Soil and Its Effect on Soil Nutrition
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S153

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    Abstract:

    The content of lead of all forms and water-soluble NH 4,K as well as rapidly available phosphorus was determined through the cultivation of Sajiang black soil,yellow cinnamon soil and red earth with added lead.The feature of form and distribution of added lead and the effect it made to soil nutrient was studied.The result showed: the contents of lead of exchangeable form and residual form were red earth>yellow cinnamon soil> Sajiang black,the contents of carbonate lead were red earth> Sajiang black soil> yellow cinnamon soil,the contents of Fe-Mn oxide-bound lead were red earth> Sajiang black soil> yellow cinnamon soil,and the contents of organic combined lead were red earth> Sajiang black soil> yellow cinnamon soil;the proportion of lead of exchangeable form and residual form rose as the added lead increased,while that of organic combined form lead reduced,the proportion of carbonate combined form lead in Sajiang black soil and that of Fe-Mn oxide-bound form lead in red earth,however,rose as the lead increased when the added lead is less than 500 mg/kg,and reduced when the added lead was more than 500 mg/kg.In the soil where extra lead was added,the concentration of water-soluble NH 4,K rose which increase the risk of efflux. Water-soluble phosphorus and lead ion was consolidated into undissolved lead phosphate, that reduce the concentration of rapidly available phosphorus,decrease the effect of water-soluble phosphorus.

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  • Revised:August 24,2007
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