Responses of Organic Phosphorus and Its Fractions to Long-Term Fertilization in Black Soil Aggregates
This study investigated the influence of long-term localized fertilization on the content and fractions of organic phosphorus in black soil aggregates from the perspective of soil aggregate microenvironment.The results showed that the application of organic fertilizer significantly increased the content of organic phosphorus,labile or-ganic phosphorus(LOP),moderate labile organic phosphorus(MLOP)and moderate resistant organic phosphorus(MROP)in different size aggregates.Organic phosphorus was mainly distributed in microaggregates(＜0.25 mm).MLOP was the main organic phosphorus in aggregates.The application of organic materials can promote the transfor-mation of soil organic phosphorus into more active forms,thereby enhancing the availability of soil phosphorus.
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