【作者】 张强；

【导师】 金晓媚；

【作者基本信息】 中国地质大学（北京） ， 水文学及水资源， 2011， 硕士

【摘要】 鄂尔多斯高原煤、石油、天然气等矿产资源丰富,开发潜力巨大,是我国21世纪重要的能源基地。海流兔河流域地处鄂尔多斯高原北部,由于本身处于干旱半干旱的毛乌素沙漠东南部边缘,因此生态环境十分脆弱。近年来由于国家对此区域的开发加大,致使生态环境发生严重变化:地下水位降低、部分地区出现盐碱化沙地以及由于开矿导致的区域生态环境的破坏。这不符合国家的环境可持续发展战略。所以为了更合理的开发鄂尔多斯盆地,加强此地区的生态勘查,评价此地区的生态环境显得尤为重要。本题用植被这个环境中最重要的因子作为研究重点,以归一化植被指数(NDVI)为主要研究指标,分析1985~2008年24年间植被的年际变化规律和区域变化规律,以2008年植被为主要研究对象探讨植被月际变化规律;通过这些规律进一步分析植被与气象因子、地面高程、地貌、地下水以及人为因素的相互关系。通过分析发现:(1)海流兔河流域年平均NDVI在0.05~0.35之间徘徊,1985~2008年间海流兔河流域的植被除1989年之外总体状况逐年变好(2)近二十五年来海流兔河流域植被变化最大的地区为海流兔河谷地区,变化最明显的地区为北部沙地地区,与1985年相比北部沙地地区的NDVI平均增长了200%。变化最不明显的地区为补浪河上游地区和西南部灌木地区。(3)在影响植被分布的气象因子中,温度与降水起主导作用,降水对植被的影响有一年左右的延迟时间,对植被影响最不明显的气候因子是蒸发量。(4)在植被与高程相互关系中发现,在高程1350m左右出现了一个NDVI相对低值,在1050m,1300m处出现了NDVI相对高值区。(5)植被与地下水位的关系中发现0.3m为水生植被临界水位埋深,0.8 m为土壤盐渍化极限水位埋深,2.9m为植被发育最好水位埋深,2.8m为当地最优势植被发育水位,0.8～4m为当地优势植物适合发育水位区间。(6)人为因素对植被的影响具有明显的突变性。更多还原

【Abstract】 Erdos Plateau is rich in coal, oil, gas and other mineral resources. It will be one of the most important energy bases of China in the 21st century. Hailiutu River basin is located in the north of the Erdos Plateau. Because it is in arid and semi-arid southeastern edge of Maowusu Desert, the ecological environment is very fragile. In recent years, the increasing development of the region resulted in severe environmental changes: depletion of groundwater level, salinization and environmental destruction caused by mining in some regions. This does not meet with national environmental strategies for sustainable development in China. Therefore, strengthening the regional ecological environment survey and evaluation are very important to the rational development of the Erdos Plateau. The study selected vegetation as the research focus, which is the most important factor in environment and the normalized difference vegetation index (NDVI) as the main indicators. By means of variation analysis of vegetation during 24 years(1985 to 2008) and monthlyvariation of vegetation in 2008, the relationship between vegetation and impact factors of meteorology, elevation, topography, groundwater, and the human activity were discussed in this thesis.It is found that: (1) the annual average NDVI of Hailiutu River basin is changed between 0.05and 0.35, and the vegetation became better with year from 1985 to 2008 except the year of 1989. (2)In the last twenty-five years the largest Vegetation changes was in valley region. The most obvious change was in sandy areas in northern region, which average NDVI in northern sandy region increased by 200% compared with 1985. The most unobvious changes of vegetation appeared in Bulang River region and the southwestern shrub areas. (3)In the meteorological factors which affecting the distribution of vegetation, temperature and precipitation played the most dominant roles and there was a one year delay about the effect of rainfall on vegetation. The evaporation has liitle impact on vegetation change. (4) Through the relationship between vegetation and elevation, it is found that: the NDVI in the elevation of 1050m is relatively low and in the data of the elevation of 1350m and 1300m is relatively high. (5) Based on the relationship between vegetation and groundwater level, it is found that: 0.3m is the threshold of the ground water depth for aquatic vegetation, 0.8m is threshold of groundwater depth of soil salinization, 2.9m is the groundwater depth with best vegetation growth, 2.8m is best groundwater depth for the dominant vegetation, 0.8 ~ 4m plant was suitable water depth for the local dominant vegetation. (6) The impact of human activity on the vegetation is changed obviously.更多还原