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在四川盆地的平原区和丘陵区,通过4年8作的田间定位试验,研究了秸秆还田免耕和翻耕两种方式对土壤的微形态特征的影响,这对了解秸秆还田对土壤特性演化及生态环境的影响有重要意义。分别采制各处理的0～10cm和10～20cm土层的原状土样,制取土壤薄片,进行土壤微形态学比较研究。结果表明:两个试验区秸秆还田翻耕与免耕处理后,在土壤基本组成成分、形成物、土壤粗粒质和细粒质、土壤垒结及微结构等微形态特征方面均有一定的特点和明显变化。从这些土壤微形态特征得知,秸秆还田形成了良好的微结构趋势,促进了有机质腐殖化,能显著改善土壤的理化特性。
In the plain and hilly areas of Sichuan Basin, the effect of straw returning to tillage and tillage on the micro-morphological characteristics of soils was studied through four years and eight field trials. The evolution of characteristics and the impact of the ecological environment are of great significance. Soil samples of 0 ~ 10cm and 10 ~ 20cm soil layers of each treatment were collected, and soil thin slices were prepared for comparative study of soil micro-morphology. The results showed that after the straw returning to tillage and no-tillage treatment in both experimental areas, there were certain micro-morphological features such as soil basic components, formation material, soil coarse grain and fine grain, soil base junction and microstructure The characteristics and obvious changes. According to these soil micromorphological features, straw returning to the field formed a good tendency of microstructure, promoted the humification of organic matter, and significantly improved the physicochemical properties of the soil.