Yin Haikui, Wang Shutao, Chen Yaheng, Zhou Yapeng, Chen Yuqi, Xu Hao
College of Resources and Environmental Sciences, Hebei Agricultural University, Baoding, 071001, China.
School of Water Conservancy and Hydroelectric Power, Hebei University of Engineering, Handan, 056038, China.
Sci Rep. 2024 May 18;14(1):11384. doi: 10.1038/s41598-024-62252-3.
Land is the spatial background and basic carrier of human survival and development. The study of land function evaluation at different scales can promote the harmonious coexistence of humans and nature. Taking Fuping County, Hebei Province, China, as an example, this study establishes the theoretical framework of county-level land scale division using a digital elevation model (DEM)-based watershed analysis method and establishes the theory and methodological system of land function evaluation from the perspective of the characteristic scale. The multifunctionality of the land was evaluated using the Carnegie-Ames-Stanford approach (CASA), the Integrated Valuation of Ecosystem Services and Trade-offs (InVEST) model and comprehensive index evaluation. By using the methods of DEM-based watershed analysis, dominant factor differentiation and layer superposition, a three-level scale system of 'subwatershed scale-land chain scale-land segment scale' and a multifunctional multiscale evaluation index system containing 18 evaluation indices were established. The single-function and multifunction evaluation results of land at different scales were obtained by the comprehensive index method and Getis-Ord Gi* index method. The accuracy of land function evaluation results mainly depends on the selection of the measurement scale. The land measurement scale determined by DEM-based watershed analysis is close to the intrinsic scale of land function evaluation. The scale effect of land function in different temporal and spatial ranges is also evident and shows obvious spatial heterogeneity and difference. At larger scales, individual functions show synergistic effects.
土地是人类生存与发展的空间载体和基础。不同尺度土地功能评价研究有助于促进人与自然和谐共生。以中国河北省阜平县为例，本研究运用基于数字高程模型（DEM）的流域分析法构建县级土地尺度划分理论框架，从特征尺度视角建立土地功能评价理论与方法体系。采用改进的卡内基 - 艾姆斯 - 斯坦福方法（CASA）、生态系统服务与权衡综合评估模型（InVEST）和综合指数评价法对土地多功能性进行评价。运用基于DEM的流域分析法、主导因子判别法和图层叠加法，构建了“子流域尺度 - 土地链尺度 - 土地段尺度”三级尺度体系及包含18个评价指标的多功能多尺度评价指标体系。采用综合指数法和Getis - Ord Gi*指数法获取不同尺度土地单功能和多功能评价结果。土地功能评价结果的准确性主要取决于尺度选择。基于DEM的流域分析法确定的土地尺度接近土地功能评价的内在尺度。不同时空范围内土地功能的尺度效应明显，呈现出显著的空间异质性和差异性。在较大尺度上，各功能表现出协同效应。
