玉米秸秆还田对土壤中磷有效性的影响

Effect of Maize Straw Returning to Soil on Phosphorus Availability

采用土柱培养法,在室内模拟了玉米秸秆还田后的腐熟过程,研究秸秆的不同还田量对土壤中磷有效性的影响。结果表明,玉米秸秆的添加造成土壤pH不同程度的升高,但有机质、有效磷、水溶性磷及酸溶性磷含量均明显增加,土壤理化性状得到明显改善;各种形态的磷含量随土壤深度的增加而相应的减少。由此可知,添加10 000 kg/hm2玉米秸秆能明显地提高土壤中磷的有效性。

The composting process of maize straw returning to soil was simulated and its effect on soil phosphorus availability was studied. As indicated by the results, the returning of maize straw resulted in a increase in soft pH to different degrees, and greatly improved the contents of organic matter, available phosphorus, water-soluble phosphorus and acid-soluble phosphorus, the physio-chemical properties of soil were obviously upgraded. With the increasing soil depth, the contents of various forms of phosphorus showed a decreasing trend. It was finally con- cluded that the application of 10 000 kg/hm^2 of maize straw could markedly increase available phosphorus content.