论文部分内容阅读
本文选择适合于石灰性土壤的无机磷分级方法,对北京地区石灰性土壤的无机磷形态、分布、及各形态磷对植物的有效性进行研究.结果表明:法适用于石灰性土壤的无机磷分级.按照上述方法可将土壤无机磷分为五级.供试土壤无机磷以Ca—P为主,平均占全磷的74.5%,五级磷含量的分布顺序为:Ca—PⅢ>Ca—PⅡ>Ca—PⅠ>Fe—P>Al—P,分别占土壤全磷的51.4%、14.9%、8.3%、3.6%、2.7%.与植物效应参数的相关分析和油菜盆栽试验前后土壤各级无机磷的变化两方面来研究土壤各级无机磷对作物的有效性,认为在北京地区石灰性土壤上,Ca—PⅠ是供给作物吸收的主要磷源,次之为Al—P、Fe—P,而Ca—PⅡ可做为土壤的一种贮备磷源.Ca—PⅢ对作物无效.
In this paper, inorganic phosphorus, which is suitable for calcareous soil, was selected to study the forms and distribution of inorganic phosphorus in calcareous soils of Beijing area and the effectiveness of various forms of phosphorus on plants.The results showed that the method was suitable for inorganic phosphorus Grading.According to the above method can be divided into five soil inorganic phosphorus inorganic phosphorus for the test soil to Ca-P-based, accounting for 74.5% of total phosphorus, five phosphorus content distribution sequence: Ca-PⅢ> Ca- PⅡ> Ca-PⅠ> Fe-P> Al-P, accounting for 51.4%, 14.9%, 8.3%, 3.6% and 2.7% of the total phosphorus in soil respectively. Correlation analysis with plant effect parameters and soil- In order to study the availability of inorganic phosphorus at different soil levels on both inorganic and inorganic phosphorus sources, Ca-PⅠis believed to be the main source of phosphorus available for crop uptake in calcareous soils in Beijing, followed by Al-P, Fe-P , While Ca-PⅡ could be used as a kind of reserve phosphorus source in soil.Ca-PⅢ was not effective on crops.