秸秆还田模式对农田土壤稳定性团聚体粒径组成的影响

Effects of Straw Returning Modes on Particle Size Composition of Stable Soil Aggregates in Farmland

研究在小麦-玉米轮作条件下实施不同的作物秸秆还田模式对农田土壤稳定性团聚体粒径组成的影响。结果表明,在不进行秸秆还田措施条件下,土壤中粉粒(粒径2~20μm)的百分含量最高,达(54.41±2.87)%,而小麦秸秆还田能够分别增加38.90%的砂粒、降低24.53%的粉粒和14.37%的黏粒含量,且能够增强土壤的抗侵蚀能力,而施肥和玉米秸秆还田对农田土壤稳定性团聚体影响较小。

The effects of different crop straw returning modes on the particle size composition of stable soil aggregates under wheat-maize rotation were studied. The results showed that under the condition of no straw returning measures, the percentage of silt(2~20 μ m) in soil was the highest(54.41 ± 2.87)%, while wheat returning could increase sand content by 38.90%, decrease silt content by 24.53% and clay content by 14.37%, and can enhance soil resistance to erosion. However, the fertilizer and maize straw returning had little effect on soil aggregate stability.