岷江上游土地利用变化的地形梯度效应分析  

Terrain gradient effect analysis of land use change in upper reaches of Minjiang River

作　　者：宦吉林 王铁霖 吴柏清 HUAN Jilin;WANG Tielin;WU Boqing(College of Tourism and Urban and Rural Planning,Chengdu University of Technology,Chengdu 610059,China;Human Geography Research Center of Qinghai-Tibet Plateau and Its Eastern Border,Chengdu University of Technology,Chengdu 610059,China)

机构地区：[1]成都理工大学旅游与城乡规划学院,四川成都610059 [2]四川省高校人文社会科学重点研究基地青藏高原及其东缘人文地理研究中心,四川成都610059

出　　处：《人民长江》2022年第7期63-69,共7页Yangtze River

基　　金：国家自然科学基金项目(40972225);四川省教育厅人文社科重点项目(12SA0070)。

摘　　要：地形对土地的利用方式和空间格局有着直接作用,是丘陵山区土地利用空间格局的重要影响因素。以岷江上游为例,应用GIS分析土地利用格局在地形综合指数分级上的变化趋势。结果表明:(1)研究区主要土地利用类型为草地和林地,近年来林地和未利用地减少,耕地、草地、建设用地等增加。(2)土地利用空间分布存在明显地形梯度效应;耕地和建设用地优势区集中于低地形区,林地和未利用地优势区集中于中地形区,草地优势区集中于高地形区,水域优势区则低、高地形区均有。(3)土地利用程度综合指数随地形位指数增加而下降,2020年低地形位梯度区土地利用程度显著高于2000年。Terrain has a direct effect on land use and spatial patterns, and it is an important factor affecting the spatial distribution pattern of land use in hilly and mountainous areas.Taking the upper reaches of Minjiang River as an example, the change trend of land use pattern in topographic comprehensive index classification was analyzed by GIS.The results showed that:(1) The main land use paterns in the study area were grassland and forest land.In recent years, forest land and unused land decreased, cultivated land, grassland and construction land increased.(2) The spatial distribution of land use had obvious topographic gradient effect.The advantage area of cultivated land and construction land concentrated in the low terrain area, the advantage area of forest land and unused land concentrated in the middle terrain area, the advantage area of grassland concentrated in the high terrain area, and the advantage area of water area was low and high terrain area.(3) The comprehensive index of land use degree decreased with the increase of terrain niche index, and the land use degree in low topographic gradient area in 2020 was significantly higher than that in 2000.

关 键 词：土地利用变化 地形位 分布指数 地形梯度 岷江上游 

分 类 号：X171.1[环境科学与工程—环境科学]