施肥与地膜覆盖对土壤有机质平衡的影响

Effects of Fertilization and Plastic Film Covering on the Balance of Soil Organic Matter.

用田间长期定位试验法研究了施肥与地膜覆盖条件下玉米连作在壤质棕壤中有机质的矿化、积累和平衡。结果表明，土壤有机质矿化率在０．０１０７～０．０４３８／ａ之间，施肥与地膜覆盖有利于土壤有机质的积累与平衡，并加快有机质矿化；在本试验各施肥处理中土壤有机质均有所积累；在连年稳定施肥条件下。

The field longterm location testing method was used for the study of the mineralization, accumulation and balancing of soil organic matter in corn field with fertilization and plastic film covering. The results of the study showed that the mineralization rates of soil organic matter varied from 1.07% to 4.38% in field condition. Fertilization and plastic film covering have been proved in the study to be good for the accumulation and balancing and can increase the mineralization rate of soil organic matter. In the study,net accumulation of soil organic matter had been occurred in all the treatments except the control. It has been predicted that continuing stable application of organic fertilizers for years could significantly improve the balance of organic matter in soil.