黑土无机磷形态及其有效性研究

采用顾、蒋提出的无机磷分级方法,对吉林省黑土进行了无机磷形态组成的研究。结果表明:供试黑土中60%～80%左右的磷以无机磷形式存在,其组成如下:O-P(16.25%～61.0%)>Fe-P(11.42%～38.63%)>Ca10-P(11.66%～34.48%)>Al-P(8.71%～23.77%)>Ca2-P(5.17%～22.51%)>Ca8-P(1.81%～27.19%)。利用相关分析和通径分析相结合的方法,研究比较了各组无机磷对有效磷的相对重要性,它们依次是:Ca2-P>Al-P>Fe-P>Ca8-P>O-P>Ca10-P。在吉林省黑土中Ca2-P是主要磷源,而Al-P、Fe-P是Ca2-P的有效补充。黑土中各形态无机磷的组成是相对稳定的,而且它们可以通过自身或者另外一方直接或间接地影响土壤中有效磷的含量。建立了Olsen-P与对其影响较大的二因子间的回归方程:y=2.433 0.466x1 0.134x3。

Study on Forms of Inorganic Phosphates and Their Usefulness in Black Soils in Jilin Province

Study on the forms of inorganic phosphates and their usefulness in black soils in Jilin province by Gu and Jiang's method. The results showed: the amount of inorganic phosphates about 60%~80% in the total-P of black soils,and their composing is:O-P(16.25%~61.0%)>Fe-P(11.42%~38.63%)>Ca_(10)-P(11.66%~34.48%)>Al-P(8.71%~23.77%)>Ca_2-P(5.17%~22.51%)>Ca_8-P(1.81%~27.19%)?Use related coefficient analysis and path coefficient analysis to discuss the relation between every form inorganic phosphates and available phosphates, draw the conclusion that: available phosphates that with draw by Olsen's method mainly is Ca_2-P, their relativity is very obvious, but Al-P,Fe-P are valid complement of Ca_2-P.Every form inorganic phosphates is stable relatively on composing, and they can effect each other. Established the equation between Olsen-P and another factors that effect mainly on Olsen-P.