Effects of Long-term Culture and Fertilization on the Contents of Forms of Phosphorus and Their Availability in Albic Soil Transformation mechanism and availability of mutrients in albic soil plant system Ⅴ Effect of organic material on phosphorus availability in soil wheat rhizosphere system Effect of organic material on transformation and translocafion of metal oxide in albic soil and their impacts on soil fertility Transformation mechanism and availability of mutrients in albic soil plant system ⅡInorganic phosphorus transformation in albic soil