Study on Change of Landscape Pattern Characteristics of Comprehensive Land Improvement Based on Optimal Spatial Scale

Baoping Feng, Hui Yang, Yarong Ren, Shanshan Zheng, Genxiang Feng () and Yuwei Huang
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Baoping Feng: College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China
Hui Yang: College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China
Yarong Ren: Nanjing Water Conservancy Center, China Design Group Co., Ltd., Nanjing 210014, China
Shanshan Zheng: Yangzhou City Guangling District River Management Center, Yangzhou 225002, China
Genxiang Feng: College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China
Yuwei Huang: College of Agricultural Science and Engineering, Hohai University, Nanjing 210098, China

Land, 2025, vol. 14, issue 1, 1-19

Abstract: Comprehensive land improvement causes strong disturbances of land use patterns in the short term, resulting in changes in landscape structure and function. This study adopts the moving window method and semi-variation function to explore the spatial scale effect of landscape pattern metrics in the comprehensive land consolidation project area of Baimahu Farm, and the spatial variability and homologous ecological processes. The results showed that: (1) patch density, largest patch index, area-weighted average shape index, contagion, and division index all showed obvious scale effects, and the suitable first and second scale domains in the study area are 5–7 m and 35–40 m, respectively, and 5 m is the most suitable grain size for the study of landscape pattern change. (2) The block basis ratio of the semi-variogram of the six landscape level indices begins to stabilize at the window radius of 210 m. This scale can reflect the spatial variability of the landscape pattern in the study area and is the most suitable analysis range. (3) The fragmentation degree of paddy fields as landscape matrix decreased and the landscape dominance degree increased in the comprehensive land improvement; the degree of fragmentation of irrigated land and agricultural land for facilities increased, the aggregation of land for construction increased, the dominance degree of the pond surface decreased, and the overall landscape diversity of each mosaic decreased; the landscape heterogeneity of ditches, rural roads, forest and grassland corridors was weakened, and the ecosystem service function was weakened. (4) The trend of increased fragmentation, simplification of landscape types, and decreased diversity presented by the landscape pattern clearly indicates that the landscape pattern of the study area has been seriously damaged to some extent under the influence of human activities. This damage not only has a direct negative impact on the local ecological environment, but also poses a potential threat to the sustainable development of the region.

Keywords: comprehensive land improvement; landscape pattern index; spatial scale effect; moving window method; semi-variance function (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2025
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