吉林省西部黑钙土无机磷形态及有效性研究

Inorganic Phosphorus Forms and Availability of Chernozem in Western Jilin Province

为了探究黑钙土各组分无机璘的含量及其与速效璘的相关性,采用土壤无机磷分级的方法,对吉林省西部黑钙土进行无机确组成的研究。结果表明:在供试土壤中,总无机璘含量为154.1-381.1 mg/kg,占全确含量的33.5%-79.9%,其中以O-P为主,其次为Cal0-P,分别占全磷含量的14.1%~42,1%和9.0%~36.8%,其余各形态无机磷含量大小依次为Al-P(11.9%~27.1%)>Ca8-P(1.4%~26.5%)>Ca2-P(0.7%~21.5%)>Fe-P(1.7%~13.6%);结合相关分析和通径分析,对不同形态无机璘的有效性进行比较,其与速效磷的相关性依次为Ca2-P(r=0.735^**)>Ca8-P(r=-0.332^*)>Fe-P(r=0.214)>A1-P(r=0.099)>Ca10-P(r=0.046)>0-P(r=-0.040),且各组无机磷间存在动态平衡的关系,从而直接或间接地影响速效磷的含量,其中仅Ca2-P的相对有效性较高,通径系数为0.909,其余形态无机磷的相对有效性远远小于Ca2-P;建立各组无机璘对速效璘影响较大的线性回归方程:y=10.182+0.364坷。这说明,在黑钙土中,Ca2-P可视为有效璘源,Cas-P.A1-P和Fe-P的有效性次于Ca2-P,而O-P和Ca10-P为无效磷源,难以被植物吸收利用。

In order to explore the content of inorganic phosphorus fractions and correlation with a・vailable phosphorus,the inorganic phosphorus composition of chernozem in the west of Jilin province was studied with the method of inorganic phosphorus classification proposed by Gu and Jiang.The results showed that in the tested soil,the total amount of inorganic phosphorus was 154.1〜381.1 mg/kg,accounting for 33.5%~79.9%of total phosphorus,in which O-P is the main,followed by Ca10-P,accounting for 14.1%〜42.1%and 9.0%〜36.8%of the total phosphorus content,respectively.The contents of inorganic phosphorus in the remaining forms were in the order of Al-P(11.9%〜27.1%)>Ca8-P(1.4%〜26.5%)>Ca2-P(0.7%〜21.5%)>Fe-P(1.7%〜13.6%).Combined with relation analysis and path analysis,the effectiveness of different forms of inorganic phosphorus were compared.The correlation with available phosphorus was Ca2-P(r=0.735^*)>Ca8-P(r=-0.332^*)>Fe-P(r=0.214)>A1-P(r=0.099)>Ca10-P(r=0.046)>O-P(r=-0.040).In addition,there was a dynamic balance between inorganic phosphorus in each group which directly or indirectly affected the content of available phosphorus,among which,only the relative validity of Ca2-P was higher,and the diameter coefficient is 0.909.The relative validity of the remaining forms of inorganic phosphorus was far less than Ca2-P.A linear regression equation was established for each group of inorganic phosphorus which had greater effect on available phosphorus:y-10.182+0.364%j.Research showed that in chernozem,Ca2-P could be considered as a source of available phosphorus,and the effectiveness of Ca8-P,Al-P and Fe-P was inferior to that of Ca2-P while O-P and Ca10-P were potential phosphorus sources and difficult to be absorbed by plants.