摘要:土地利用变化影响因素研究是当前土地利用变化领域的热点。本研究拟探究地形因子对区域土地利用变化的影响程度，解释人地系统相互作用的内在机制，以期为区域土地开发与空间利用的结构、方向、模式等提供科学依据。根据研究区自然条件、土地利用特点和地形因素特征，从宏观地形因子和微观地形因子两个方面选取评价指标，建立地形因素对土地利用变化影响程度评价指标体系；在此基础上，采用熵权法和环比评分法相结合确定评价指标权重的方法，建立基于改进指数和法的地形因素对土地利用变化影响程度综合评价模型，基于河南省栾川县2005-2015年3期Landsat遥感影像和DEM数据，利用GIS和RS技术定量评价了研究区地形因素对土地利用变化的影响程度。评价结果显示，2005-2015年间地形因子中的高程、坡度、坡向、坡长、坡向变率和地表切割度对研究区土地利用变化的影响程度评价值增加，而坡度变率、平面曲率、剖面曲率、高程变异系数、地形起伏度和地形粗糙度的影响程度评价值减小。2005-2010年研究区地形因子对土地利用变化的影响程度评价变化值为0.000 978，变化率为7.06%；2010-2015年地形因子对土地利用变化的影响程度评价变化值为-0.001 705，变化率为-11.50%；2005-2015年地形因子对土地利用变化的影响程度评价变化值为-0.000 727，变化率为-5.25%。这些数据结果显示，2005-2015年地形因子对土地利用变化的影响程度呈现先增加后减少的趋势。研究结果表明，随着社会经济发展，在人类技术水平的提高、政治经济结构的合理化以及保护生态环境意识和政策等人文驱动因素条件下，地形因子作为影响土地利用变化的自然驱动因素之一，对土地利用变化的影响程度总体呈现减小趋势。该研究可为区域土地利用规划、城市建设和生态环境保护提供重要的数据参考与技术支撑。
关键词:地形因子/
改进指数和法/
土地利用变化/
栾川县
Abstract:Land use change is the interaction result of human activities and natural environment under social and economic impact. Discovering factors affecting land use change is the hot spot and has very important significance for researches on resources, environment and socioeconomic issues. Terrain directly influences land use change. Therefore, it is crucial to explore the extents of terrain affecting the regional land use changes. In order to explain the interaction of human-land system and provide the basis for sustainable land use, environmental protection and ecological reconstruction, we conducted a research on the performance of terrain factors with regard to land use change. The study aimed to explore the influence extents of terrain factors on regional land use change, so as to provide scientific basis for regional land development and land use spatial structure, direction and mode. In view of the existing problems in the research field, based on the natural conditions, land use characteristics and terrain factors of the study area, we chose 12 evaluation indexes from the macro-terrain factors and micro-terrain factors to establish the evaluation index system. Then, a comprehensive evaluation model of terrain factors influencing on land use change was established based on the improved Index Sum method. Indexes weights were determined by combining Entropy method and Decision Alternative Ratio Evaluation System to overcome the objectivity of the Entropy method and improve the rationality of weight determination of the improved Index Sum method. The influencing extent of terrain factors on land use change in Luanchuan County of Henan Province was evaluated using the established method. The results showed that the influencing extents of terrain factors of evaluation, slope, slope direction, slope length, slope direction variability and surface cutting extent increased from 2005 to 2015, while those of slope variability, plane curvature, profile curvature, elevation variation coefficient, terrain relief and terrain roughness decreased. The change in comprehensive influencing extent of terrain factors on land use change was 0.000 978 and the change rate was 7.06% from 2005 to 2010, which were -0.001 705 and -11.50% from 2010 to 2015, and -0.000 727 and -5.25% from 2005 to 2015. These results showed a tendency of increase-decrease of terrain factors influencing extent on land use change from 2005 to 2015. The evaluation results showed that the terrain factors, as the natural driving factors of land use change, had a decreasing trend of influence extent with the social and economic development, improvement of human technology, rationalization of political and economic structure and environment protection. The results provided the important data reference and scientific basis for regional land use planning, urban construction and ecological environment protection.
Key words:Terrain factor/
Improved Index Sum Method/
Land use change/
Luanchuan County
PDF全文下载地址:
http://www.ecoagri.ac.cn/article/exportPdf?id=23a9296b-14d6-4d5b-b0a3-7895f1c08832
