长期轮作施肥对土壤有机质及其组分的影响

研究了长期轮作施肥对土壤有机质及其组分的影响，结果表明：在不施肥耕种条件下，通过粮豆轮作，基本可以维持土壤有机质的平衡，但其活性有机质含量、腐殖酸总量及胡敏酸含量却在不断下降，单施化肥，开始时土壤有机质含量降低，以后随耕种年限的延长，基本可以维持在较低水平，活性有机质、腐殖酸总量、胡敏酸和胡敏素含量降低，富里酸含量提高；施用有机肥处理，特别是施用高量有机肥，有利于提高胡敏酸和胡敏素比例，而减少富里酸的生成，培肥作用较为明显。

Influence of Long-Term Rotation and Fertilization on Soil Organic Matter and Its Components

The results showed that soil organic mater could maintain balance . without applying fertilizer in the maize-soybean rotation treatment, but the amount of soil active organic matter and humus decreased. With. applying chemical fertilizer, soil organic matter humus and humic acid declined, whereas fulivic acid increased. Applying organic fertilizer, especially high organic matter, could give raise to increasing of soil humic acid, but decreasing of humic acid.