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[1]LU Qingping,ZHAO Cuiwei,WANG Jie.Analysis of Land Use Patterns in Pure Karst, Non-karst and Subkarst Areas Based on Terrain Gradient[J].Research of Soil and Water Conservation,2021,28(05):333-339.

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Analysis of Land Use Patterns in Pure Karst, Non-karst and Subkarst Areas Based on Terrain Gradient

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 28 Number of periods: 2021 05 Page number: 333-339 Column: Public date: 2021-08-20

Title:: Analysis of Land Use Patterns in Pure Karst, Non-karst and Subkarst Areas Based on Terrain Gradient

Author(s):: LU Qingping^1,2,ZHAO Cuiwei^1,2,WANG Jie^1,2; (1.School of Geography and Environmental Science,Guizhou Normal University,Guiyang 550025,China; 2.Collaborative Innovation Center for Ecological Environment Protection and Resource Utilization in Karst Mountains,Guiyang 550025,China)

Keywords:: pure karst; semi-karst; non-karst; terrain gradient; distribution index; spatial pattern

CLC:: F301.24

DOI:: -

Abstract:: To explore the spatial distribution characteristics of topographic gradient of land use in pure karst,semi-karst and non-karst,Qianzhong area was taken as the research area,and opographic position index and distribution index were used. The results show that:(1)the land use types in the research area have similar topographical gradient characteristics on the whole; rural residential areas,paddy fields,gardens,roads,infrastructure land,urban construction land,irrigated land and water areas are in 1～3 terrain gradients; the distribution of advantages is significant,with woodland,shrubs and grassland and unused land having distribution advantages in topographical positions 7～10,while the distribution of advantages in dry land mainly concentrates in low and general topographical positions;(2)there are significant differences in topographic gradient characteristics of the same landscape type in different landform types; the non-karst area has the widest distribution of woodland topography(topography range 5～9),followed by the pure karst area(topography range 4～8),and the semi-karst area is more narrow(topography range 4～7); grassland distributes in the topography range of 5～10 in both pure karst and non-karst,semi-karst is the worst(topography range 4～9); pure karst paddy field has the strongest topography selectivity(topography range 1～3),the selectivity of the subkarst and non-karst areas is weak(topography range 1～4); the rural settlements in pure karst and non-karst areas are monotonously decreasing,while in the semi-karst areas,they increase first and then decrease; the rate of change of the dominant distribution of dry land and unused land in the non-karst area is lower than that in semi-karst area,and much lower than that in the pure karst area,while the water area is just the opposite. The different karst landforms with the same land use types have differences in the dominant distribution range,change trend and rate,and land use has significant topographic gradient characteristics.

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Last Update: 2021-08-20