长期施肥对土壤无机磷形态组成的影响

采用顾益初、蒋柏藩提出的石灰性土壤无机磷分级方法，研究了施肥对土壤无机磷形态组成的影响。结果表明：①施用含磷肥料（化肥或有机肥），均可显著地增加Ｃａ＿２－Ｐ、Ｃａ＿８－Ｐ、Ａ１－Ｐ和Ｆｅ－Ｐ的含量，其中钙磷增量约为铁铝磷的２倍；②Ｃａ＿（１０）－Ｐ和Ｏ－Ｐ在短时间里是不能生成的。旱地长期施用化学磷肥，可明显地提高Ｏ－Ｐ和Ｃａ＿（１０）－Ｐ的含量；③长期施用含磷肥料，除被作物吸收利用外，残留在土壤中的无机磷，约有６０％以上是以有效磷源存在的。

Effect of Long Term Fertilization on Inorganic-P Form Composition in Soil

This paper studies the influence of fertilization on morphological compo-sition of soil inorganic-Pin terms of a scheme developed by Gu Yichu and Jiang Baifanfor fractioiializing inorganic-P in calcareous soil. The results showed that :1 ) Usingphosphate fertilizers, chemical or organic, the contents of Ca_2-P,Ca_8-P,Al-P and Fe-Pcould be increased significantl The increment of Ca-P was twice as much as those ofFe-P and Al-P.2)Ca_(10)-P and O-P could not be formed in a short time,but their contentscould be raised obviously by using chemical fertilizer for a long term in arid soil.3) Witha long term P fertilizerapplication,there was still about 60%of the residual P availablein soil after crop absorption