Study on the Terrain Gradient Effect of Land Use Changes in the Luohe River Basin of the Eastern Qinling Mountains
The clear relationship between the land use changes and the terrain factors in regions with typical topographical variations has profound practical implications for the national spatial planning and the harmonious de-velopment of regions.This study focused on the Luohe River Basin in the eastern segment of the Qinling Mountains.By analyzing the multi-temporal land use data and DEM data,sophisticated methodologies such as land use map-ping,standard deviation ellipse analysis,and terrain position analysis were employed to reveal the spatio-temporal nuances characterizing local land use changes since 2000 and investigate the terrain gradient effects under different scenarios of land use alterations.The results are as follows.(1)Over the past two decades,land use changes in the basin have primarily involved the cultivated land,grassland,and construction land,showing distinct heterogeneity in types and temporal disparities in change patterns.(2)The predominant land use pattern,dominated by the culti-vated land and forest land,covers 88.17％of the total area in the basin.Early-change and late-change types consti-tute 7.44％and 3.51％,respectively.The conversion of the cultivated land to the construction land shows a tenden-cy towards more disordered development.(3)The cultivated land in the basin,located at low to moderate terrain gradients,gradually shifts towards areas with lower terrain gradients.The terrain distribution index of forest land fol-lows an upward"S"shaped trend,while the grassland displays a normal distribution pattern with higher values in the middle and lower values on both sides.(4)The terrain distribution indices of each land use pattern in the basin exhibit distinctive trends with increasing terrain positions,indicating a pronounced terrain gradient effect in land use changes.The study suggests that land management efforts in the Luohe River Basin should prioritize the land use patterns characterized by repetitive changes and continuous transformations.Additionally,careful attention should be given to scientifically mitigating and guiding issues related to the soil erosion in the cultivated land as well as the development and utilization of slope farmland.
land use changeterraineffectgeoscience atlasthe Luohe River Basin of the eastern Qinling Mountains
万方数据
维普
