(论文 字数: 13018页数:27)摘 要:以新疆典型干旱区于田绿洲为例,在提取各类LUCC空间影响因子的基础上,应用灰色关联度方法分析了各个因子在LUCC过程中的相对影响力大小,同时也验证了在类似CA的土地单元空间转变模拟模型中常见空间因子选择的合理性。从导致区域生态环境问题的主要驱动因素——土地利用/覆盖变化(LUCC)为出发点,以遥感技术为依托,对三个不同时相的陆地卫星数据以及相关统计资料进行了分析处理,利用得到的土地覆盖差值图像,定量分析了该研究区域1979年-2001年的时空变化趋势及其主要的驱动因子。分析结果显示:造成绿洲—荒漠交错带生态环境变化的主要原因是绿洲人口数量的增加和过度樵采等,不合理的水土资源利用导致绿洲荒漠化和交错带的地下水位下降。绿洲—荒漠交错带普遍存在植被覆盖大面积下降现象,先前连续的过渡带已有转化成生态裂谷的趋势,绿洲的屏障作用也进一步降低;绿洲外围风沙前沿地带在起风沙的作用下,流沙侵入农田,进一步恶化了本已很贫瘠而又脆弱的农业生态环境。因此,现阶段绿洲外围生态环境较为恶劣,整体环境处于不稳定状态。 ABSTRACT :A typical arid region of Xinjiang Yutian Oasis as an example,in space LUCC from various influencing factors on the basis of gray correlation analysis of the various factors in the process of LUCC the relative influence of size, also verified by the CA in similar land space modules change simulation model space factor common choice is reasonable. Resulting from the region's ecological environment is the major driving factors -- land use / land cover change (LUCC) as a starting point, remote sensing technology as the basis, not of three phases of the land satellite data and related statistical data analysis, use of the land cover images margin, Quantitative analysis of the study area in 1979 -2001, the spatio-temporal trends and the main driving factors. Analysis of the results showed: Oasis caused -- desert ecotone changes in the ecological environment is the main reason for Oasis population and the increase in the number of over-cutting. Unreasonable use of water and land resources led to desertification and Oasis Ecotone the lowering of the groundwater table. The decline of large areas of vegetation cover is widespread exsiting in Oasis -- desert ecotone , The previous consecutive zone is trended to be transformed into ecological, the role of the barriers of oasis is further to reduce ; in the role played sandstorms. Quicksand of Oasis external frontier of sandstorms invaded farmland and was further deteriorating,the very poor and fragile ecological environment. Therefore, at this stage, ecological environment of frontier oases is more bad and the overall environment is in a state of instability. 1 引言 |
于田绿洲—荒漠交错带土地覆盖时空变化研究
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