【摘要】 对西北农林科技大学农作一站长期肥料试验地0—20 cm耕层土壤研究表明:(1)易释放的各形态磷与全磷呈正相关关系;(2)土壤磷素的释放能力随pH值的增大而减小,不同处理的缓冲能力不同。释放能力的大小也与全磷的多少有关;(3)土壤全磷与PSD(土壤磷饱和度)有很好的正相关性。因此,基于以土壤饱和度为25%作为预测指标,把土壤全磷环境敏感指标(TP)为1.92 g/kg作为关中磷淋溶的环境敏感指标。更多还原

【Abstract】 Researches on the 0—20 cm surface soil in a long-term experiment of soil and fertilizer at the First Station of Agricultural Cultivation of Northwest University of Agricultural and Forestry showed that easily released phosphorus of various fractions had a close positive correlation with total phosphorus(TP).The ability of soil releasing phosphorus reduced as pH increased,and the buffer capacity differed in different treatments.The releasing ability was also related to TP.Total phosphorus of surface soil had a significantly positive relation with PSD.So,the PSD of 25% of the soil was considerated to be a predicting index,and TP of 1.92g/kg could be used as sensitive environmental index which would predicted phosphate leaching in Guanzhong Plain soil.更多还原