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[1]Lian Shishu,Lan Anjun,Fan Zemeng,et al.Spatiotemporal evolution trends and topographic gradient effects of cultivated land transformation in river basins of karst mountainous areas in Guizhou Province[J].Research of Soil and Water Conservation,2025,32(06):391-402.[doi:10.13869/j.cnki.rswc.2025.06.039]

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Spatiotemporal evolution trends and topographic gradient effects of cultivated land transformation in river basins of karst mountainous areas in Guizhou Province

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 32 Number of periods: 2025 06 Page number: 391-402 Column: Public date: 2025-10-20

Title:: Spatiotemporal evolution trends and topographic gradient effects of cultivated land transformation in river basins of karst mountainous areas in Guizhou Province

Author(s):: Lian Shishu¹,Lan Anjun¹,Fan Zemeng^2,3,Feng Bingcheng¹,Xiao Kuisong¹; (1.School of Geography and Environmental Science,Guizhou Normal University,Guiyang 550025,China;2.State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101;3.College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100039)

Keywords:: cultivated land transformation; spatiotemporal characteristics; kernel density analysis; topographic gradient effect; Nanpan and Beipan River basins

CLC:: F323.4

DOI:: 10.13869/j.cnki.rswc.2025.06.039

Abstract:: [Objective] The ecological environment in the river basins of karst mountainous areas is sensitive, severely afflicted by issues such as soil erosion and rocky desertification, and characterized by tense human-land relationship. Analyzing the spatiotemporal characteristics and topographic gradient effects of cultivated land transformation in this region is crucial for cultivated land protection and ecological development of the river basins. [Methods] Using the Nanpan and Beipan River Basins, typical karst river basins in Guizhou, as the study area, and based on land use data from 2000 to 2020 and Digital Elevation Model(DEM) within the river basins, a topographic gradient effect model for cultivated land transformation in the river basin was established by comprehensively considering parameters such as kernel density, dynamic indicators of cultivated land use, and topographic position. Combined with the socioeconomic development of the river basin, the intrinsic driving factors of cultivated land transformation in karst mountainous river basins were investigated. [Results](1) From 2000 to 2020, cultivated land in the Nanpan and Beipan River Basins of Guizhou exhibited a spatial distribution pattern of ‘more cultivated land in central, relatively more in western, and less in southeastern regions’. The morphology of cultivated land underwent a drastic transformation process of ‘increase first, then decrease, and increase again’, but an overall decreasing trend was observed. (2) Cultivated land in the river basins was distributed within the elevations of 1 200~1 500 m, slope gradients of 6°~15°, terrain relief of 0~30 m, and lowto- medium topographic position ranges. Moreover, it generally showed shrinking trends across different topographic position ranges. (3) From 2000 to 2020, cultivated land transformation demonstrated a significant topographic gradient effect. The area of slope cultivated land changes was the largest within low topographic position ranges, involving transformation mainly between cultivated land, grassland, forest and back to cultivated land. Cultivated land changes showed a migration trend from steep to gentle slopes and from high to low elevations. [Conclusion] During the spatiotemporal evolution of cultivated land in karst mountainous river basins, the characteristics of natural geographical environment determine the basic distribution patterns of cultivated land. Changes in socioeconomic conditions affect the utilization mode and efficiency of cultivated land, while policies regulate and guide the spatiotemporal evolution trends of cultivated land at the macro level. The dominant factors influencing the change in slope cultivated land vary significantly across different topographic gradients.

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Last Update: 2025-12-10