摘要： 还田有机物在地膜覆盖下的分解略高于露地栽培,腐殖化系数为0.17～0.41,土壤有机质的年亩矿化量为92～164kg.有机无机肥配施,对土壤有机质的贡献高于不施肥、单施化肥和单施有机肥,尤其是未经分解的有机物,适量配施化肥,明显优于等氮量的腐熟有机肥.为此,要重新组合农业措施.以调整土壤有机质分解与积累之间的关系.

关键词: 地膜覆盖, 有机质, 腐殖化系数, 矿化率

Abstract: The decomposition of field-returned organic matter under film mulching was slightly higher than that under open ground cultivation, the humusifica-tion factor being 0.17-0.41, and the annual mineralization per mu (1/16 hectare) 92-164 kg. Application of mixed organic fertilizer and mineral fertilizer contributed more organic matter to soil than non-application, and only application of chemical ferilizer or organic fertilizer. Especially for undccompo-sed organic matter, appropriate application of chemical fertilizer is obviously superior than that of thoroughly decomposed organic fertilizer of equal amount of nitrogen. Therefore, it is necessary for recombine agronomic practices to adjust the relationship between the decomposition and accumulation of soil Organic matter.

Key words: Film mulching, Organic matter, Humusif ication factor, Rate Of mineralization