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以冬闲-双季稻种植模式为对照(CK),分析了黑麦草-双季稻(Ry)、紫云英-双季稻(Mv)、马铃薯-双季稻(Po)和油菜-双季稻(Ra)5种不同种植模式下冬季覆盖作物秸秆还田后对0~5、5~10、10~20 cm土壤有机碳、活性有机碳、碳库管理指数和有机碳储量的影响.结果表明:与CK处理相比,黑麦草、紫云英、马铃薯和油菜秸秆还田处理均提高了稻田0~5、5~10、10~20 cm土壤总有机碳和活性有机碳含量,其中Po处理最高.冬季覆盖作物秸秆还田均提高了稻田不同层次土壤的碳库活度、碳库活度指数、碳库指数和土壤碳库管理指数,其大小顺序均表现为Po>Mv>Ry>Ra>CK.不同冬季覆盖作物秸秆还田处理与CK处理相比均有利于提高稻田不同层次土壤有机碳储量,其中以紫云英秸秆还田的效果最好,黑麦草和马铃薯次之;各处理稻田土壤有机碳储量均随土壤深度的增加而递增.
Taking CK and CK as CK, the effects of ryegrass-double cropping rice (Ry), astragalus mongholicus-double cropping rice (Mv), potato-double cropping rice (Po) Effects of straw mulching with straw mulching on soil organic carbon, active organic carbon, carbon stock management index and organic carbon storage in 0 ~ 5, 5 ~ 10, 10 ~ 20 cm under five different planting modes of rice (Ra) The results showed that the soil total organic carbon and active organic carbon in 0 ~ 5, 5 ~ 10, 10 ~ 20 cm of paddy field increased with the treatments of ryegrass, milk vetch, potato and rapeseed compared with CK, The highest coverage of winter mulching crop straw returning increased the carbon pool activity, carbon pool activity index, carbon pool index and soil carbon pool management index in different soil layers in rice field. The order of their sizes was Po> Mv> Ry> Ra> CK. Compared with CK treatment, straw mulching in different winter mulching treatments could improve soil organic carbon storage at different levels of paddy field, of which the effect of straw mulching with Chinese milk vetch was the best, followed by ryegrass and potato Soil organic carbon storage in paddy soil increased with soil depth increasing.