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为明确秸秆循环还田土壤环境效应变化,筛选合理的秸秆还田方式,于2000年设计了不同秸秆还田方式定位试验,通过对秸秆还田后土壤理化性状分析,结果表明各处理土壤紧实度随深度增加而增加,在45 cm处达到最大值,下层土壤比上层土壤紧实,秸秆还田处理均低于现行耕法;秸秆还田各处理三相结构合理,特别是在20~40 cm优于现行耕法,土壤孔隙增多,渗透能力增强。秸秆还田各处理土壤养分明显改善,特别是有机质含量明显增加,与对照比较提高幅度为0.26~0.74 g/kg。
In order to clarify the changes of soil environmental effects of straw returning to the field and to screen reasonable ways of returning straw to soil, different positioning methods of returning straw to soil were designed in 2000. Through analysis of soil physical and chemical properties after straw returning, the results showed that the soil compaction The degree increased with depth and reached the maximum at 45 cm. The soil in the lower layer was tighter than that in the upper layer, and the treatment of straw in the field was lower than that of the current tillage method. The three-phase straw was suitable for treatment, especially in the range of 20-40 cm is better than the current tillage method, the soil porosity increases, the penetration ability is enhanced. Soil nutrients in treated straw significantly improved, especially organic matter content increased significantly, compared with the control increased by 0.26 ~ 0.74 g / kg.