黄土旱塬长期施肥条件下土壤磷素变化及管理

The Variation of Soil Phosphorus of Long-term Continuous Cropping and Management on Loess Plateau

根据长武旱塬长期定位试验研究 ,黄土旱塬区土壤中无机磷以 Ca- P为主 ,占无机磷总量的 70 %以上 ,O- P占无机磷总量的 9.19% ,Al- P、Fe- P分别占无机磷总量的 5 .96 %和 5 .2 3%。无机磷各组分中 Ca2 - P有效性最高 ,其次为 Al- P、Fe- P、Ca8- P。长期施肥土壤剖面全磷、速效磷含量增加 ,无机磷各组分均有增加。

According to the study on long term experiments in Changwu dry highland,the highest availability of soil inorganic P is Ca 2-P,then Al-P, Ca 8-P, and Fe-P.The Ca-P,Al-P,Fe-P constituents would decrease on the condition of continuous cultivation without applying fertilizers. Yet, the O P constituents would increase. Contents of soil organic matter, total P, available P of different soil layers went up when continuous applying fertilizers, and all the constituents of soil inorganic phosphorus would either increase.