摘要
长江经济带面临水生态环境污染制约下的农业发展困境,水环境约束下耕地利用生态效率的提升成为平衡耕地利用中经济效益与生态效益的关键手段,对于探索生态可持续的耕地利用模式、实现农业绿色发展具有重要意义。该研究以灰水足迹为视角,基于SBM-Undesirable模型、空间自相关分析及马尔可夫链模型探明2000—2020年长江经济带耕地利用生态效率时空格局及演变趋势。研究表明:1)长江经济带2000—2020年平均灰水足迹值呈现先增后减趋势,2015年后下降态势更为明显。在空间上呈现为“东西高,中部低”的空间分布特征,灰水足迹高值区域主要集中在粮食主产区省份。2)2000—2020年长江经济带耕地利用生态效率持续下降,效率均值处于0.5~0.8之间,存在较大提升空间。在空间上呈现高值区域多沿水系分布的特点。3)长江经济带市域耕地利用生态效率存在显著空间正相关性,以研究时段演变趋势来看,耕地利用生态效率的演进存在路径依赖,难以实现“跨越式”提升。因受到邻域背景影响,在空间上易显现出“俱乐部收敛”现象,“高-高集聚”与“低-低集聚”分布更为常见。可在农业生产重点区域采用差异化精准农业模式,需重视区域间动态协同发展,完善联防联治的面源污染防控机制,积极引导耕地利用生态效率高值区域逐步形成集中连片,同时对于耕地利用生态效率低效区提供财政与政策支持。研究结果可为各地区探索耕地利用可持续发展模式与农业生产活动中水生态环境保护提供参考依据。
The Yangtze River Economic Belt confronts the paradoxical challenge of agricultural growth and substantial water environmental contamination.Enhancing the eco-efficiency of cultivated land use while considering water environment limitations has emerged as a pivotal approach to harmonizing economic and ecological benefits in cultivated land utilization,thereby holding significant implications for exploring ecologically sustainable modes of cultivated land utilization and achieving green agricultural development.In light of this,a cultivated land use eco-efficiency evaluation index system is developed in this study,using the connotation definition of cultivated land use eco-efficiency from the standpoint of the grey water footprint.This study utilized the SBM-Undesirable model to assess the eco-efficiency of cultivated land use in 130 cities within the Yangtze River Economic Belt for the period from 2000 to 2020.Additionally,the spatial and temporal trends in ecoefficiency of cultivated land use,as well as their evolution from 2000 to 2020,were analyzed utilizing the spatial autocorrelation and Markov chain models.The findings indicate that the average grey water footprint value of the Yangtze River Economic Belt exhibited an initial increase followed by a subsequent decrease from 2000 to 2020.The decline in the grey water footprint value after 2015 was more pronounced,potentially attributable to the implementation of ecological management projects such as non-point source pollution control and reduction in fertilizer and pesticide usage in response to national policies across all regions.Simultaneously,the spatial distribution pattern of the grey water footprint demonstrated a"high in the east and west,low in the middle"trend,with higher values primarily concentrated in major grain-producing provinces.The intensive utilization of cultivated land and excessive resource consumption further exacerbated water environment pollution and ecological degradation within these regions.Throughout the period from 2000 to 2020,
作者
柯新利
杜丹妮
刘姿媚
KE Xinli;DU Danni;LIU Zimei(College of Public Administration,Huazhong Agricultural University,Wuhan 430070,China)
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2024年第7期277-287,F0003,共12页
Transactions of the Chinese Society of Agricultural Engineering
基金
教育部哲学社会科学重大攻关项目(20JZD015)
教育部哲学社会科学研究后期资助项目(21JHQ019)
国家自然科学基金面上项目(42371278)
国家自然科学基金青年项目(72204094)。
