红壤中各种结合态磷分布状况及其对酸的敏感性研究

通过考察和对浙江沿海地区红壤研究，明确了各种状态磷的分布状况以及它们对酸的敏感性。结果表明，土壤中的磷以闭蓄态的Fe—P为主，占80％以上，而可溶性磷和有机磷的含量不足20％。这与红壤的化学成分和风化程度有关。可溶性磷对酸的敏感性很高，闭蓄态磷对酸的敏感性比较低，但对磷的迁移还是起一定影响。可溶性磷中Ca—P和Al—P的敏感性又比Fe—P高。

Distribution of Bound Phosphorus in Lateritic Soils and Their Sensitivity to Acidity

The lateritic soils from coastal area of Zhejiang are studied to find the distribution of various bound phosp horus and their sensiitivity to acidity.The result s showed that fixed Fe -P was main form,accounting for more than 80%,and di ssolved Ca -P Al -P Fe -P only no more than 20%.This was r elated with chemical composition in the lateritic soils and their weathering degree.The dissolved phosphorus was very sensitive to acidity.However,the sensitivity of the fixed phosphorus to acid ity was low,but it had some impacts on transition of phosphorus into the soils.The bound Ca -P an d Al -P were more sensitive to acidity than Fe -P in the dissolved phosphorus.