长期定位施肥对无机磷形态转化及其有效性的影响

通过对不同施肥模式下灰漠土无机磷形态研究,结果表明:(1)新疆灰漠土磷素以无机磷为主,占全磷85 9%;无机磷中又以钙磷为主,其中Ca10-P和Ca8-P占无机磷总量的81.5%,Ca2-P仅占2.3%,O-P,Al-P,Fe-P分别占6.1%,5.9%,4.2%.(2)不施磷或施磷但不均衡施肥,均会导致土壤有效磷下降;氮磷钾均衡施肥和有机肥配施氮磷钾化肥,会使土壤有效磷持平或上升;(3)灰漠土磷素中,Ca2-P有效性最高,Q-P有效性最低,有效性顺序为:Ca2-P＞Fe-P＞Al-P＞Ca8-P＞Ca10-P＞O-P.

Effect of Long-time Fixture on the Soil Inorganic Phosphor Forms and Validity in Grey Desert Soil

The results of the research about the inorganic phosphor patterns of the Grey desert soil under the different fertilization models showed: (1) the inorganic phosphorus is mainly inorganic phosphate in the grey desert soil in Xinjiang,it acounted for 85.9%; the inorganic phospous of the grey desert soil is main calcium phosphate. The Ca10-P and Ca8-P acounted for 81.5%, Ca2-P just acounted for 2.3%.The O-P, Al-P and Fe-P separately accounted for 6.1%, 5.9% and 4.2%.(2) It will cause the descent of the supplying phosphor capability of the soil under the models of no-fertilization or no-balance fertilization. Under the balance fertilization and increasing organic fertilizer circumstance, the applying phosphor capability of the Grey soil can be improved and the accumulation of the available phosphor can be increased. (3) in the Grey desert soil inorganic phosphor forms, the validity of Ca2-P is the highest, the validity of O-P is the lowest; in turn of the validity of the soil inorganic phosphor forms is: Ca2-P>Fe-P>Al-P>Ca8-P>Ca10-P>O-P. =