【摘要】 为探讨双季稻地区还田秸秆的腐解进程，用尼龙网袋法研究了不同类型水稻秸秆不同埋深（0、10 cm）对还田秸秆的腐解和氮碳释放的影响。结果表明，经过早稻90 d、晚稻120 d的腐解，早稻和晚稻的平均腐解率分别为64%和72%。秸秆在还田的前15 d腐解速度较快，在秸秆还田后的30～90(120)d秸秆腐解速度放缓。秸秆腐解率晚稻季高于早稻季，常规籼稻高于杂交籼稻，杂交籼稻高于杂交粳稻，表层秸秆腐解速率略快于下层秸秆。在当季水稻生育期结束时，还田秸秆的氮释放率为60%～70%，秸秆碳释放率达70%～80%，不同埋深对秸秆碳氮释放率影响不显著，表层碳释放略快。更多还原

【Abstract】 In order to explore the decomposition process of straw in the double cropping rice region,the nylon mesh bag method was used to study the effects of different types of rice straws returned at different buried depths(0,10 cm) on the straw decomposition and nitrogen and carbon release.The results showed that after 90 days of decomposing for early season rice and 120 days for late rice,the average decomposing rates of early season rice and late rice were 64% and 72%,respectively.Straw decomposed faster in the first 15 days of returning to the field,and slowed down in the later 30 ～ 90(120) days.The decomposing rate of straw in late rice season was higher than that in early rice season,besides,conventional Indica Rice was higher than Indica Hybrid Rice.And Hybrid Indica Rice was higher than Hybrid Japonica Rice.Meanwhile,the decomposing rate of surface straw was slightly faster than that of deeper straw.At the end of the rice growth period,the nitrogen release rate of the straw was 60% ～ 70%,and the carbon release rate of the straw reached 70% ～ 80%.Different depths had no significant effect on the carbon and nitrogen release rate of straw,and the carbon release in the soil surface layer was slightly faster.更多还原