【摘要】 [目的]探明不同水旱轮作系统对稻田不同土层土壤活性有机碳组分、碳库管理指数、土壤有机碳储量和作物产量的短期影响。[方法]2017年在荆州市江陵县三湖农场开展试验,采用随机区组设计,设置中稻-冬闲(RF)、中稻-油菜(RR)、中稻-小麦(RW)和春玉米-晚稻(MR)4种种植模式。[结果]与RF处理相比,MR处理显著降低了稻田不同层次的土壤总有机碳含量;且RW、RR和MR处理均降低了稻田土壤活性有机碳含量。MR处理有利于碳库活度和碳库活度指数的提高,RR处理则利于稳态碳和碳库指数的提高。不同土层各处理的土壤有机碳储量差异趋势一致,均为RR>RF>RW>MR,与RF处理相比,RR处理土壤有机碳储量增加了8.14%。与RF处理相比,RW、RR和MR处理产量分别增加了46.71%、35.77%和35.33%。[结论]RR模式更有利于稻田土壤有机碳的固持,是适宜在当地推广的水旱轮作模式。更多还原

【Abstract】 [Objective] In order to give an insight into soil active organic carbon in different soil layers,carbon pool management index,soil organic carbon storage and crop yieldas short-term affected by paddy-upland rotation systems.[Method] A field experiment was conducted at Sanhu Farm of Jiangling County of Jingzhou in 2017.Different cropping patterns were established following a design of randomized complete block with rice-fallow(RF),rice-rapeseed(RR),rice-wheat(RW) and maize-rice(MR).[Result] Compared with RF treatment,MR treatment significantly reduced the total organic carbon content in different layers of paddy soil,and RW,RR and MR treatment all reduced the active organic carbon content in paddy soil.MR treatment was benefit to increasing activity of carbon pool and carbon pool activity index; whereas,RR treatment was benefit to increasing stable carbon and carbon pool index.The soil organic carbon storage difference in different soil layers showed same tendency among paddy-upland rotation systems,all were RR > RF > RW > MR.Compared with RF treatment,soil organic carbon storage of RR treatment increased by 8.14%.Compared with RF treatment,the yield of RW,RR and MR treatment increased by 46.71%,35.77% and 35.33%,respectively.[Conclusion] RR pattern is more conducive to the retention of soil organic carbon in paddy fields,and is suitable for the promotion of paddy-upland rotation system in the local area.更多还原