摘要
地形作为自然环境因素在一定程度上影响着区域土地利用变化,对区域土地利用空间格局及结构特征有着重要影响。以阆中市为研究对象,基于2019年土地变更调查矢量数据和DEM数据,利用ArcGIS的空间分析功能对阆中市土地利用的地形梯度效应,综合分形维数和稳定性指数指标进行分析,以明确阆中市土地利用的空间分形特征。结果表明:(1)阆中市各土地利用类型具有明显的地形梯度特征,高程、坡度及地形位3个因素对阆中市土地利用空间分布格局的形成具有显著影响;(2)耕地、园地、居民点及工矿用地、水域的优势分布区间集中在地形位指数为1的区间,草地的优势分布则集中于地形位指数为6~7的区间,林地的优势分布集中在地形位指数>2的区间;其他用地和交通用地则无明显优势分布集中区域;(3)阆中市各土地利用类型分形维数在1.2 452~1.9 855,土地利用类型空间分布呈现出明显的分形特征,其中水域和交通用地最为稳定;其他用地、居民地及工矿用地、园地、草地稳定性次之,耕地和林地稳定性相对较差。
As a natural environment factor,the topography affected the change of regional land use to a certain extent,and had an important impact on the spatial pattern and structural characteristics of the regional land use.By taking Langzhong City as the research object and based on the vector data and DEM data of land change survey in 2019,the spatial analysis function of ArcGIS combined with the fractal dimension and stability indexes were used to analyze the terrain gradient effect of land use in Langzhong City,so as to clarify the spatial fractal characteristics of land use in Langzhong City.The results showed that:(1)Various land use types in Langzhong City had obvious terrain gradient characteristics,and the three factors including elevation,slope and terrain niche had significant influence on the formation of the spatial distribution pattern of land use in Langzhong City;(2)The dominant distributions of cultivated land,garden land,residential land,industrial and mining land and water area were concentrated in the interval with the terrain niche index of 1,and the dominant distribution of grassland was concentrated in the interval with the terrain niche index of 6-7,while that of forest land was concentrated in the interval with the terrain niche index greater than 2.Other land use and land for transportation had no obvious concentration areas of dominant distribution.(3)The fractal dimension of various land use types in Langzhong City ranged from 1.2452 to 1.9855.The spatial distribution of land use types showed obvious fractal characteristics,of which the water area and land for transportation were the most stable,followed by the stability of other land,residential land,industrial and mining land,garden land and grassland,while the stability of cultivated land and forest land was relatively poor.
作者
蒋良群
舒成强
刘辉
冯建平
JIANG Liang-qun;SHU Cheng-qiang;LIU Hui;FENG Jian-ping(School of Geography Science,China West Normal University,Nanchong,Sichuan 637009,China;Sichuan Engineering Laboratory of Soil Erosion Monitoring and Control in Arid Valley,Nanchong,Sichuan 637009,China)
出处
《福建农业科技》
CAS
2022年第5期79-85,共7页
Fujian Agricultural Science and Technology
基金
南充市社科研究“十四五”规划2021年度重点项目(NC21A009、NC21A010)
四川省教育厅重点项目(15ZA0150、17ZA0380)
西华师范大学英才科研基金项目(17YC109、17YC120)
西华师范大学基本科研业务项目(17C034)
西华师范大学博士启动基金项目(14E003)。
关键词
土地利用
地形梯度
空间结构
分形
阆中市
Land use
Terrain gradient
Spatial structure
Fractal
Langzhong City
