论文部分内容阅读
2002~2006年,在甘肃河西走廊金昌市永昌县,采用小麦─玉米免耕轮作种植模式,研究了轮作免耕条件下不同处理对土壤有机碳、无机碳和微生物量碳含量的影响。结果表明:短期免耕对土壤的有机碳、无机碳、活性有机碳均没有明显影响,而对土壤微生物量碳含量有明显增加,说明土壤耕作制度对土壤有机碳的影响只有经过较长的时期才能反映出来,而土壤微生物量对耕作措施的反应则在较短的时间内即可以显示出来。种植不同作物,免耕对土壤碳库管理指数影响不同。就小麦而言,免耕高留茬明显增加了土壤碳库指数。免耕秸秆覆盖+播前耙地增加土壤碳库管理指数,而免耕高留茬和免耕秸秆覆盖减小土壤碳库管理指数。就玉米而言,土壤的碳库指数没有明显变化。免耕秸秆覆盖、免耕高留茬增加了土壤碳库管理指数,而免耕秸秆覆盖+播前耙地降低了土壤碳库管理指数。
From 2002 to 2006, the no-tillage rotation mode of wheat-maize was adopted in Yongchang County, Jinchang City, Gansu Hexi Corridor. The effects of different treatments on soil organic carbon, inorganic carbon and microbial biomass carbon under no tillage were studied. The results showed that short-term no-tillage had no significant effect on soil organic carbon, inorganic carbon and active organic carbon, but significantly increased soil microbial biomass carbon, indicating that soil tillage system had only a long period of effect on soil organic carbon Can be reflected, and the reaction of soil microbial biomass to farming measures can be displayed in a short period of time. Different cultivated crops, no-tillage on soil carbon inventory management index different. In the case of wheat, no-till high stubble significantly increased soil C stocks index. No-tillage straw mulching + preharvest raking increased soil carbon pool management index, whereas no-tillage high yield stubble and no-tillage straw mulching reduced soil carbon pool management index. In the case of maize, there was no significant change in soil C stocks. No-tillage straw mulching and no tillage and high stubble increased soil carbon pool management index, while no-tillage straw mulching and pre-sowing rake reduced soil carbon pool management index.