论文部分内容阅读
为探明南方稻麦两熟制农田秸秆还田模式对土壤总有机碳、活性有机碳、碳库管理指数和稻麦产量的影响,论文通过8 a的水稻-小麦轮作田间定位试验,设置了4个秸秆还田模式处理:秸秆不还田(CK)、秸秆稻麦季均还田(RW)、仅麦秸稻季还田(W)、仅稻秸麦季还田(R)。结果表明,与CK处理相比,秸秆还田显著提高了0~20 cm土壤的总有机碳、活性有机碳、稳定态有机碳(P<0.05);不同秸秆还田模式处理之间的土壤总有机碳、稳定态有机碳差异均不显著(P>0.05),RW处理的活性有机碳、碳库活度指数、碳库管理指数与R处理无显著差异性(P>0.05),显著大于W处理(P<0.05);RW与R处理的水稻产量均值无显著差异性(P>0.05),显著大于W处理;活性有机碳、碳库管理指数与水稻产量均值呈极显著相关(P<0.01),与小麦产量均值关系不密切(P>0.05);上述结果表明,与稻麦两季还田模式相比,南方稻麦两熟制农田实施仅稻秆麦季还田模式,并不影响作物稳产性与土壤地力的提升。
In order to find out the effects of straw return to paddy field system on soil total organic carbon, active organic carbon, carbon pool management index and rice and wheat yield in South China, wheat-wheat double cropping system was set up Four straw returning treatments: straw returning (CK), straw returning wheat (RW), straw returning only (W), straw harvest alone (R). The results showed that compared with CK treatment, straw returning increased the total organic carbon, active organic carbon and steady state organic carbon (P <0.05) in 0 ~ 20 cm soil significantly. Soil total amount (P> 0.05). There were no significant differences in active carbon, carbon pool activity index and carbon stock management index between R and RW treatments (P> 0.05), which were significantly higher than those of W (P <0.05). There was no significant difference (P> 0.05) between RW and R treatments and significantly higher than W treatments. There was a significant correlation between active carbon and carbon management index and rice yield (P <0.01) ), Which was not closely related to the average wheat yield (P> 0.05). The above results showed that compared with the two-season wheat-wheat cropping system, Crop stability and soil fertility enhancement.