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耕地固碳作为陆地主要生态系统固碳的有效补充,越来越引起学术界的广泛关注。但是,目前耕地固碳功能研究多从生态学角度研究耕地植被、土壤等碳吸收、碳释放以及将耕地看作纯自然生态系统研究系统碳平衡,缺乏从土地利用和管理学科角度对耕地固碳功能进行系统阐述和研究。黄淮海平原作为中国重要的粮食主产区,区内耕地面积大,耕地利用模式典型。本文以黄淮海平原为研究区,从耕地利用系统的角度出发,基于整个系统碳循环过程,构建了黄淮海平原耕地利用系统固碳功能研究基本框架,并基于生态学角度陆地生态系统固碳相关研究成果,从耕地固碳能力、固碳效率和固碳优势度三个方面对黄淮海平原耕地固碳功能进行了评价。研究结果表明:耕地利用过程中的耕地固碳功能认识,应从自然固碳能力、理想固碳能力、现实固碳能力和区域固碳能力4个层次展开,黄淮海平原耕地固碳能力在各个层级上均表现出正向性;此外,黄淮海平原耕地平均固碳效率为2.5,固碳优势度达到0.85,黄淮海平原耕地固碳功能在本区域具有不可忽视以及区域内其他生态系统不可替代的重要作用,在本区域应该作为耕地的重要功能进行显化。本研究不仅可为耕地生态功能理论研究提供新思考点,也为提升耕地的生态效益、缓解气候变化以及耕地生态补偿方面研究提供了参考和支撑。
As an effective complement to the fixation of carbon in the main ecosystem of arable land, cultivated land carbon sequestration attracts more and more academic attention. However, at present, researches on carbon sequestration in cultivated land mostly study the carbon sequestration and carbon release of arable land, soil and carbon from the ecological point of view, and consider the arable land as the carbon balance of the pure natural ecosystem research system. There is a lack of carbon sequestration in cultivated land from the land use and management disciplines Function system elaboration and research. Huang-Huai-Hai Plain, as an important grain-producing area in China, has a large area of cultivated land and a typical pattern of cultivated land use. In this paper, taking Huang-Huai-Hai Plain as the research area, from the perspective of arable land use system, based on the whole system carbon cycle, the basic framework of carbon sequestration in cultivated land use system in the Huang-Huai-Hai Plain was constructed. Based on the ecological perspective, Research results, from the farmland carbon sequestration ability, carbon sequestration efficiency and carbon sequestration dominance of three aspects of the Huang-Huai-Hai Plain carbon sequestration function of farmland were evaluated. The results show that the understanding of arable land carbon sequestration in cultivated land use should start from four levels: natural carbon sequestration, ideal carbon sequestration, real sequestration and regional sequestration. The carbon sequestration of arable land in the Huang-Huai-Hai Plain at all levels On the other hand, the average carbon sequestration efficiency of cultivated land in Huanghuaihai Plain was 2.5 and the carbon sequestration dominance reached 0.85. The carbon sequestration function of cultivated land in the Huang-Huai-Hai Plain is not negligible in this region and can not be replaced by other ecosystems in the region The important role that should be manifested in the region as an important function of arable land. This study not only provides a new thinking point for the study of the ecological function of cultivated land, but also provides reference and support for improving the ecological benefits of cultivated land, mitigating climate change and ecological compensation of cultivated land.