摘要
节水、降碳是长江经济带农业可持续发展面临的主要挑战,对农田生态系统的碳水关系进行耦合研究,有助于明确农业水资源的可持续性和厘清农业碳排放的规律,为农业生产水资源管理和低碳可持续发展提供决策支持。从碳水关联视角出发,基于碳水足迹理论,引入足迹广度与足迹深度对2011—2020年长江经济带农田生态系统碳水足迹进行评价,并利用耦合协调度模型对农田生态系统的碳水足迹耦合关系进行探究。结果显示:(1)长江经济带农田生态系统处于碳赤字、水盈余阶段,四川省碳赤字水平最高,湖南省水盈余指数最高。(2)长江经济带农田生态系统碳足迹广度整体呈现“先增长后下降”的趋势,四川省最高,上海市最低,且高值区主要集中在长江经济带上游;除贵州省外,其余省份碳足迹深度均等于1,无需动用存量资本。水足迹广度整体呈波动下降趋势,江苏省最高,上海市最低;除江苏省外,其余10省份水足迹深度均等于1,无需动用水资源存量资本。(3)长江经济带农田生态系统碳足迹与水足迹的耦合协调度逐年上升;从时间维度来看,整体耦合协调度还不够高;从空间维度来看,碳水足迹耦合协调度均值呈“上游>中游>下游”的分布特征。(4)长江经济带碳水足迹耦合协调发展水平存在空间依赖,空间关联性存在不稳定性,波动较大,主要表现为高-高集聚区数量增多,高-低集聚区减少,低-低、低-高集聚区较为稳定。
Water conservation and carbon reduction are key challenges for the sustainable development of agriculture in the Yangtze River Economic Belt,and coupled with research on the water-carbon relationship of farmland ecosystems can help to clarify the sustainability of agricultural water resources and elucidate the pattern of agricultural carbon emissions,and provide decision-making support for the management of water resources for agricultural production and low-carbon sustainable development.This paper evaluates the carbon footprint of farmland ecosystems in the Yangtze River Economic Zone from 2011 to 2020 from the perspective of carbon and water correlation,based on the theory of carbon and water footprints,introduces the breadth and depth of footprints,and utilizes the coupling coordination degree model to explore the coupling relationship between carbon and water footprints of farmland ecosystems.The results show that:(1)the farmland ecosystems in the Yangtze River Economic Zone are in the stage of carbon deficit and water surplus,with the highest carbon deficit in Sichuan Province and the highest water surplus index in Hunan Province.(2)The carbon footprint of farmland ecosystems in the Yangtze River Economic Zone exhibits an overall trend of initial increase followed by a decline.,with the highest level in Sichuan Province and the lowest in Shanghai,and the high value area is mainly concentrated in the upper reaches of the Yangtze River Economic Zone;except for Guizhou Province,the carbon footprint depth for all other provinces equals 1,and there is no need to utilize the stock of capital.The breadth of the water footprint shows a fluctuating downward trend,with the highest in Jiangsu and the lowest in Shanghai;except for Jiangsu,the depth of the water footprint of the remaining 10 provinces is equal to 1,without the need to utilize the capital stock of water resources.(3)From the value of the coupling degree of coordination,the coordination between the carbon and water footprints of farmland ecosystems in the Yangtze River Economic Zone has shown a trend of annual increase,but the overall coupling degree of coordination is not high enough in the time dimension;from the spatial dimension,the average value of the coupling degree of the carbon and water footprints is distributed in the form of"upstream>middle reaches>downstream".(4)There is a spatial dependence on the coupled and coordinated development level of the carbon and water footprint in the Yangtze River Economic Zone,and the spatial correlation is unstable and fluctuates greatly,which is mainly manifested in the increase in the number of high-high agglomerations,fewer high-low agglomerations,and more stable low-low and low-high agglomerations.
作者
袁亮
柴林
何伟军
孔阳
吴霞
YUAN Liang;CHAI Lin;HE Weijun;KONG Yang;WU Xia(College of Economics&Management,China Three Gorges University,Yichang 443002,China;Key Research Institute of Humanities and Social Sciences of Hubei Province-Research Center for Integrated Watershed Management&Water Economy Development,China Three Gorges University,Yichang 443002,China)
出处
《生态学报》
北大核心
2025年第4期1613-1628,共16页
Acta Ecologica Sinica
基金
国家自然科学基金项目(72104127,72404169,71874101)
国家社科基金重大项目(19ZDA08)。
关键词
农田生态系统
碳足迹
水足迹
耦合协调
agroecosystems
carbon footprint
water footprint
coupled coordination
