【摘要】 通过西南红黄壤磷的形态研究，结果表明：其溶解度高，有效性大的钙磷（Ｃａ－ｐ）低，而极难溶解的铁磷（Ｆｅ－ｐ）却占有较高的比例；另外西南红黄壤中有机磷含量高；最后分析了不同施磷水平下土壤磷形态组成变化，土壤中钙磷和铝磷不论其含量，还是占全磷的比率都随磷肥施用量的增加而明显增加。以上说明西南红、黄壤供磷潜力大，但对植物的供磷能力差；可过通过增施磷肥、提高土壤磷酸酶的活性来增加磷的有效性。更多还原

【Abstract】 Different forms of phosphate of Southwest Red soils and Yellow Soils were investigated and studied. The results slowed: (1) the content of Ca-p, which is easily dissoluble and higher effective, is lower, but the content of Fe-P, which is not easily dissoluble, is higher than Purple Soil (Sichuan).(2) there is higher content of Organic Phosphate in those soils, (3)with increase of amount of phosphate fertilizer application, Ca-P AND Al-P, which are both absolute content and ratioes of Ca-P or Al-P to whole phosphate, are rapidly increased. Above metioned results fully revealed that , although phosphate supplied potentality is strong, effective phosphate supplied ability is very low. Therefore, effectivenss of those soils phosphate is improved by appling phosphate fertility and increasing phosphatase activity caused by ofganic fertilizer application.更多还原