干旱区叶城县土地利用/覆盖时空变化分析

Spatial and Temporal Variation Analysis of Land Use/Cover Change in Arid Area of Yecheng County

土地利用/覆盖变化研究是当今全球变化研究的热点之一。文章从干旱区叶城县2000、2005、2010、2015年4个时期的Landsat TM/ETM+/OLI遥感影像数据中提取2000—2015年的叶城县土地利用变化信息,借助RS与GIS,采用土地利用动态变化、转移矩阵以及景观格局指数等方法得出研究区的土地利用变化及驱动力因素,探讨其变化规律。结果表明:(1)2000—2015年,研究区域的总面积为13032.88km^2,土地利用/土地覆盖特征主要表现为交通用地、建设用地与绿地的面积一直保持增长趋势,而水域和未利用地的面积呈缩小趋势。(2)利用转移矩阵可知该区域城市建设用地面积主要来自于绿地和未利用地。(3)从破碎度来讲,未利用地、水域和绿地相较于交通用地和建设用地的程度要低,斑块密度减少,伴随景观异质性也降低。在人为因素和自然因素的作用下形成该区域15年的建设用地面积增加,水域面积减少。

The research about land use/cover change is one of the hottest issues in global change research today. This paper extracts land use change data of Yecheng county from 2000 to 2015 based on Landsat TM/ETM+/ OLI remote sensing image data of four periods of Yecheng county in the arid area of 2000,2005,2010 and 2015,and through assistance of RS and GIS.Dynamic change,transfer matrix and landscape pattern index methods are applied, the land use change and driving force factors in the study area are obtained,and the change law is discussed. The results demonstrate that:(1)From 2000 to 2015,the total study area is covered of 13032.88 km^2.The land use/ land cover characteristics of the area is the traffic land,The area of construction land and green space has been increasing, while the water area and unused land have been decreased(2)it can be seen that by using the transfer matrix;the urban construction land area transfer from green land and unused land.(3)In terms of fragmentation,the extent of unused land,waters and green spaces is lower,traffic land and construction land,patch density,landscape heterogeneity decreased as well.The general trend of land use change is the increase in the area of construction land and the decrease of water area in the region under the impact of human factors and natural factors.