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[目的]研究生物碳对新疆灰漠土无机磷形态的影响。[方法]室内模拟试验,试验设置三种土壤处理,分别为空白土壤(CK)、施用等碳量的秸秆和生物碳;每种土壤磷肥(P_2O_5)施用量设三个水平,分别为0、0.25和0.5g/kg。[结果]灰漠土无机磷各形态中以Ca_(10)-P为主,占60%以上;其次是Ca_8-P,占20%以上。施用磷肥可以显著提高土壤Ca_2-P、Ca_8-P、Al-P和Fe-P含量,但对O-P和Ca_(10)-P含量均无影响。施用秸秆和生物碳可以提高土壤Ca_2-P含量,尤其是施用生物碳可显著增加土壤Ca_2-P和Al-P含量,但是Ca_8-P和Fe-P含量有所减低。[结论]施用生物碳有助于提高灰漠土壤无机磷的有效性。
[Objective] The research aimed to study the effects of biochar on inorganic phosphorus forms in gray desert in Xinjiang. [Method] In laboratory simulation experiment, three kinds of soil treatments were set up, which were blank soil (CK), straw and biochar with the same amount of carbon. The application rate of P2O5 in each soil was set at three levels, 0.25 and 0.5 g / kg. [Result] The results showed that Ca_ (10) -P dominated the inorganic phosphorus in gray desert soil, accounting for more than 60%, followed by Ca_8-P, accounting for more than 20%. The application of phosphate fertilizer could significantly increase the contents of Ca 2-P, Ca_8-P, Al-P and Fe-P, but had no effect on the content of O-P and Ca_ (10) -P. The application of straw and biochar increased soil Ca 2-P content. In particular, the application of biochar significantly increased soil Ca 2-P and Al-P content, but decreased the content of Ca_8-P and Fe-P. [Conclusion] The application of biochar could improve the availability of inorganic phosphorus in the gray desert soil.