【作者】 郭丽红；

【导师】 沙占江；

【作者基本信息】 青海师范大学 ， 地图学与地理信息系统， 2011， 硕士

【摘要】 本文选取我国第一大内陆湖泊——青海湖环湖区域为试验区,借助遥感手段获取试验区2006年的Landsat TM影像为基础数据,同时以青海湖流域的植被图、土地利用图、1:50000的地形图、DEM图、环湖区的气象数据及其社会经济数据作为辅助资料。并利用软件ARCGIS9.2作分析工具,ERDAS IMAGINE9.1作图像处理工具。在前人研究成果及本论文研究需要的基础上选取沙漠化危险度评价指标,建立指标体系。运用AHP决策分析方法计算各指标的权重值,并结合沙漠化危险度综合评价模型得到研究区的沙漠化土地危险度综合图。分析表明:(1)研究区的沙漠化危险度主要有四个等级:潜在沙漠化危险、轻度沙漠化危险、中度沙漠化危险、重度沙漠化危险。其中各个等级的土地沙漠化相互交错分布,呈连续的条带状或斑点状,而且严重的土地沙漠化主要是人类经济活动相对集中的地区;(2)造成沙漠化危险的原因主要有:1、从研究区自然因素分析,整个研究区的等级分布并无一定的规律可言,即气候因素对土地沙漠化的发展进程只是起影响作用而不是决定作用;2、从研究区的内在危险性分析,潜在沙漠化和轻度沙漠化主要分布在湖的北部,呈条带状分布。而在湖周围以中度沙漠化和重度沙漠化的分布为主;3、从研究区土地现状分析,研究区的沙漠化土地呈现正过程的发展趋势;4、从研究区社会经济状况分析,中度沙漠化和重度沙漠化主要分布在人口集中的地区;总之该研究区的自然因素是土地沙漠化的诱发因素,气候是其主要的驱动力;人为因素起主导作用,人口增加是引发人类各种活动的最根本原因,是其主要驱动力。即土地沙漠化的原因是由自然因素和人为因素相互作用叠加的结果。更多还原

【Abstract】 This paper selects the largest inland lake in China - Qinghai Lake area as the experimental area, using remote sensing to obtain the test area in 2006.The paper is based on Landsat TM image data of the these periods with the Qinghai Lakebasin vegetation maps, land use map, 1:50000 topographic map, DEM map, meteorological data of Lake District, and socio-economic data as the supplementary information. It also takes software tools ARCGIS9.2, ERDAS IMAGINE9.1 as image processing tools. With the help of previous research results and research needs of this paper, index system is established on selected indicators of desertification risk assessment. Using AHP decision analysis method to weigh each index valueand evaluation model of desertification risk, a comprehensive map of risk of desertification of study area is produced. Analysis of the map shows that:(1) There are four levels of the risk of desertification in the study area: potential risk of desertification, mild desertification risk, moderate desertification risk, and severe desertification risk. In which all levels of distribution of land desertification interlace, and appear continuously banded or patchy, and also serious land desertification is in relatively concentrated areas of human economic activity;(2) Causes for desertification risk are:1, from the natural factors of the study area, the grade distribution of the entire study areat does not follow certain law, which means that climate factors on the development of desertification are influential but is not a decisive role;2, from the inner dangerous factors of study area, the potential and the mild distribution of desertification is at the north of the lake, showed a banded structure. On the contrary, the lake is mainly surrounded by distribution of moderate and severe desertification.3, from the land factors of study area, the entire area has a positive trend of land distribution;4, from the socio-economic factors of study area, moderate and severe desertification desertification mainly is distributed in the populated areas;Overally speaking, the natural factors in study area are predisposing factors for desertification, whose main driving force is climate. Human factors play a leading role and the increase in population caused by human activities is the most fundamental reason. Land desertification is a result of the interaction of natural factors and human factors.更多还原