以生荒土土壤有机质含量 3 .4 0 g/kg为起点 ,将不同轮作方式、产量水平、有机质归还方式组成不同的管理模式 ,模拟土壤有机质的动态变化。结果表明 :有机质归还模式是影响土壤有机质积累速度的首要因素 ,机械收割高留茬还田是补充土壤有机质的一条有效途径。在良好管理的条件下 ,8年后生土土壤有机质可达到 8g/kg,但与当地大田的土壤有机质含量 1 0 g/kg仍有差距 ,表明生土培肥是一个长期过程 Taking the soil organic matter content of native soil as 3.40 g / kg as the starting point, different rotation patterns, yield levels and organic matter return patterns were grouped into different management modes to simulate the dynamic changes of soil organic matter. The results showed that the return of organic matter was the most important factor affecting the accumulation rate of soil organic matter. Mechanical harvesting with high stubble was an effective way to supplement soil organic matter. Under well-managed conditions, soil organic matter up to 8 g / kg can be obtained after 8 years, but there is still a gap with the soil organic matter content of 10 g / kg in the local field, indicating that soil fertilization is a long-term process