石灰性土壤无机磷分级方法选择的研究

本文用两种无机磷分级测试方法对鲁西北石灰性土壤无机磷形态进行了系统研究。结果表明，蒋柏藩等把土壤中的Ｃａ－Ｐ分为３级能更好地说明潮土中各级磷的有效性，真实地反映Ａｌ－Ｐ的情况：在潮土中磷以无机磷为主，约占全磷总量的９４．２２％；无机磷中以Ｃａ－Ｐ类磷酸盐占主导地位，约占全磷总量的７２．７６％；Ｃａ２的含量虽少，但对作物的有效性较高，Ｃａ８－Ｐ和Ａｌ－Ｐ是土壤的缓效磷源，Ｆｅ－Ｐ的有效性处于中等偏低的水平，Ｃａ１０－Ｐ只能是潜在磷源的物质基础。

SELECTED FRACTIONATION SCHEME OF INORGANIC PHOSPHORUS IN CALCAREOUS SOIL

Inorganic Phosphorus forms were studied in calcareous soil in the Northwest Shandong Province,China. It was found that Jiang Bofan's fractionation schemeused in the calcarous soil is a better method.It can make Ca-P into three fractions andexactly explain the avability of different Phosphours and better show the content andavailability of Al-P.In the calcarous soil,rnorganic P is a main form, about 94. 22% intotal P.Ca-P, about 72. 76% in total P,is main inorganic P.Ca2-P in the soil is ofmore availability,Ca8-P and Al-P are slowly available Phosphorus.The availability ofFe-P is lower.