磷在不同土壤和无机磷组分间的转化研究

Effects of phosphorus fertilizer on different inorganic phosphorus fractions in soils

采用修改后的张守敬-Jackson法在50 d的培养过程中对施磷黄棕壤和红壤中的无机磷组分进行跟踪测定。结果表明:施用无机磷肥能全面提高土壤各无机磷组分含量,但对不同土壤中各无机磷组分间的转化影响不一。磷在黄棕壤中首先转化为水溶性磷和松结合态磷(S-P)、铝结合态磷(A l-P)和钙结合态磷(C a-P),然后S-P和C a-P继续向A l-P转化,施磷对黄棕壤中闭蓄态磷(O-P)和铁结合态磷(F e-P)含量无明显影响;在红壤中,施用的磷首先转化为S-P、A l-P和F e-P,然后S-P、A l-P继续向F e-P转化,施磷对红壤中O-P和C a-P的含量也无明显影响。

Yellow brown soil and red soil, which were applied inorganic phosphorus （Pi） fertilizer and then cultured un- der the moist condition in the room for 50 days, were sampled and contents of Pi fractions were determined with Jackson- Chang＇s method. The results indicated that phosphorus fertilizer increased the contents of all Pi fractions in soils. On yel- low brown soil the fertilized phosphorus was firstly transformed into S-P, Ca-P and AI-P, and then S-P and C.a-P converted to AI-P mainly. However, it didn＇t obviously influence the contents of O-P and Fe-P in this soil. For red soil the fertilized phosphorus was at first combined in S-P, AI-P and Fe-P, after that the S-P and AI-P were gradually transformed into Fe- P. Phosphorus fertilizer didn＇t obviously increase the contents of O-P and Ca-P in red soil.