施磷肥对土壤磷素形态转化和有效性的影响

Effects of Phosphate Fertilizer on Soil Phosphorus Forms Transformation and Its Availability

通过室内土壤培育和盆栽试验，研究了施磷肥和培育时间对灌漠土、黑垆土和褐土无机磷形态转化及有效性的影响。结果表明施入石灰性土壤的磷肥，除作物吸收利用外，主要以Ｃａ＿２—Ｐ、Ｃａ＿８—Ｐ、Ａｌ—Ｐ的形态积累；随着培育时间的推移，Ｃａ＿２—Ｐ、Ｃａ＿８—Ｐ又明显降低，并经由Ａｌ—Ｐ、Ｆｅ—Ｐ逐渐向Ｃａ＿１０—Ｐ转化。经生物试验和相关分，Ｃａ＿２—Ｐ、Ａｌ—Ｐ和Ｃａ＿８—Ｐ均是灌漠土、黑垆土和褐土的有效磷源，以Ｃａ＿２—Ｐ的贡献最大。

Effects of phosphate fertilizer application and incubation time on inorganic P formstransformation and its availability in irrigated desert soil, Heilu soil and cinnamon soil were studiedby the soil incubation in room and pot experimint. The results showed that phosphate fertilizer ap-plied to the calcareous soil accumulated maingly as Ca_2-P, Ca_8-P and Al-P forms except crop absorption. Increasing on the incubation time , the Ca_2-P and Ca_8-P decreased obviously and from Al-Pand Fe-P transformed to Ca_10-P slowly. Both biological experiment and statistical analysis point outthat the Ca_2-P, Al-P and Ca_8-P in irrigated desert soil, Heilu soil and cinnamon soil are all the mostavailable forms for plant.