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[1]An Bin,Xiao Weiwei,Cui Xiaoming.Topographic Gradient Effect of Land Use Pattern in Hanjiang River Ecological Economic Belt[J].Research of Soil and Water Conservation,2024,31(04):288-297,307.[doi:10.13869/j.cnki.rswc.2024.04.002]

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Topographic Gradient Effect of Land Use Pattern in Hanjiang River Ecological Economic Belt

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 04 Page number: 288-297,307 Column: Public date: 2024-06-30

Title:: Topographic Gradient Effect of Land Use Pattern in Hanjiang River Ecological Economic Belt

Author(s):: An Bin^1,2,3, Xiao Weiwei^1,2, Cui Xiaoming⁴; (1.School of Tourism & Environment/Academician and Expert Workstation of Shaanxi Province, Ankang University, Ankang, Shaanxi 725000, China; 2.Research Center for Rural Revitalization in Southern Shaanxi, Ankang, Shaanxi 725000, China; 3.Shaannan Eco-economy Research Center, Ankang, Shaanxi 725000, China; 4.Department of Science and Research, Ankang University, Ankang, Shaanxi 725000, China)

Keywords:: land use change; terrain gradient; topographic index; relief amplitude; distribution index(DI); Hanjiang Ecological Economic Belt(HJEEB)

CLC:: F301.2; P931

DOI:: 10.13869/j.cnki.rswc.2024.04.002

Abstract:: [Objective]The aims of this study are to explore the topographic gradient effect of land use in the Hanjiang Ecological Economic Belt(HJEEB), and to provide scientific reference for the adjustment and optimization of regional land use patterns. [Methods]Based on land use and DEM data from 1990 to 2022, four terrain features, namely elevation, slope, relief amplitude and topographic index, were selected to analyze the terrain gradient effect of land use change in HJEEB by used methods such as land use distribution index(DI), information graph. [Results]The land use structure of the HJEEB was mainly composed of forestland and farmland, with an area proportion of over 54.59% and over 35.20%, respectively. In terms of space, there was a pattern of farmland dominated in the east and forest land in the west. From 1990 to 2022, the areas of forestland, construction land, and water areas increased, while the areas of farmland and grassland decreased significantly. As the gradient level of each terrain increased, the distribution area and index of farmland, water area, and construction land gradually decreased. The area of forestland showed a trend of first increasing and then decreasing, while the DI continued to increase. The area and DI of grassland showed a trend of first increasing and then decreasing. The distribution advantages of farmland and forestland during the research period had expanded in the low to medium(Ⅰ—Ⅲ)and high to medium(Ⅲ—Ⅴ)levels of various terrain factors, respectively, with an increase in their DI ranging from 0.041 to 0.117 and 0.005 to 0.076. Except for a consistent decrease in the DI on the Ⅰ-level gradient, the distribution advantages of grassland and water area on other gradients mainly expanded, with the most significant increase in the DI being relief amplitude level Ⅲ(0.317)and topographic index level Ⅲ(0.299), respectively. The distribution advantage of construction land showed an expanding trend on the Ⅰ-level gradient, with DI increase of 0.056～0.689. During the research period, the land use information graph of the HJEEB was mainly stable, accounting for 81.39% of the study area. In addition, there were significant differences in the degree to which various types of land use information graphs were affected by terrain gradients. [Conclusion]Affected by factors such as watershed terrain structure and land use policies(returning farmland to forests, etc.), the land use pattern has a significant topographic gradient effect in HJEEB, and the change of distribution advantage is relatively complex in the topographic gradient. Therefore, the territorial space development needs to adhere to the principle of adapting to local conditions in future in order to promote the sustainable development of land resources.

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Last Update: 2024-06-30