施用有机肥对土壤有机磷转化的影响研究

Effect of manure on transformation of organic phosphorus in paddy soil

采用室内淹水灭菌培养方法,研究施用有机肥后,水稻土有机磷含量动态变化特征,并分析有机肥对水稻土有机磷各组分转化的影响。结果表明,水稻土施用有机肥后有机磷含量呈上升趋势,平均增加43.65 mg.kg-1,且随着施肥量的增加而显著增加;有机肥施用对水稻土有机磷不同组分影响强度不同,依次为高稳态有机磷>活性有机磷>中稳态有机磷>中活性有机磷;有机肥施用量与活性有机磷增加量(r=0.486**)、高稳态有机磷增加量(r=0.713**)均呈极显著正相关关系,有机肥磷素可以直接转化为活性有机磷和高稳态有机磷;无机磷降低幅度与中稳态有机磷增幅(r=0.381*)、高稳态有机磷增幅(r=0.300*)均呈显著正相关关系,施用有机肥可间接促进土壤无机磷向中稳态有机磷和高稳态有机磷转化。

Dynamic change characteristics of organic phosphorus content were analyzed by the method of waterlogged and non-sterilized incubation.The results showed that the content of organic phosphorus increased over time.As expected,the content of organic phosphorus increased with the content of organic fertilizer applied.It was found that the average amplitude of organic phosphorus was 43.65 mg·kg-1.The result that the influence of organic fertilizer on organic phosphorus fractions was different in order as highly resistant organic phosphorus〉labile organic phosphorus〉moderately resistant organic phosphorus〉moderately labile organic phosphorus was indicated.A highly significant positive correlation between fertilizing content and labile organic phosphorus（r=0.486＊ ＊）,fertilizing content and highly resistant organic phosphorus（r=0.713＊ ＊）were observed.Significant positive correlation existed between decreasing amplitude of total inorganic phosphorus and moderately resistant organic phosphorus（r=0.381＊）,decreasing amplitude of total inorganic phosphorus and highly resistant organic phosphorus（r=0.300＊）.On the basis of correlation analysis,it was concluded that phosphorus in organic fertilizer could directly transform into labile organic phosphorus and highly resistant organic phosphorus,inorganic phosphorus into moderately resistant organic phosphorus and highly resistant organic phosphorus indirectly.