摘要
依据最新遥感影像和多种统计资料,完成了新疆维吾尔自治区85个县区植被覆盖和土地退化指数的测定,采用全样本统计和剖面分析方法,揭示了新疆植被覆盖与土地退化的关系及空间分布格局。结果表明:基于县域的植被覆盖与土地退化呈负指数关系,随着植被覆盖指数的降低,土地退化呈上升趋势,南疆的土地退化甚于北疆;受地形分布格局和水汽来源的影响,新疆植被覆盖与土地退化的空间分布格局为:从东北向西南呈"三山夹两盆"结构,山地植被覆盖指数高、土地退化指数低,盆地植被覆盖指数低、土地退化指数高;受来自北冰洋水汽环流和高山冰雪融水的影响,从西北向东南植被覆盖指数逐渐下降,土地退化指数逐渐升高。基于县域的植被覆盖与土地退化指数的空间分布,较好地再现了地形分布格局和水汽环流形势。图6,表1,参14。
According to the recent RS image and the varieties of statistic data, the both of vegetative coverage and land degradation rates of 85 counties in Xinjiang are determined by GIS method, the relationship and spatial distribution between vegetation coverage and land degradation rate of Xinjiang is opened out using the methods of all swatch statistic and typical section analysis. The results are follows: the relationship of vegetation coverage and land degradation rates is negative exponent, as the fall of vegetation coverage ratio is, the rise of land degradation rate is, the land degradation in south Xinjiang is serious than that in the north Xinjiang. Based on the influence of the topography distributions, the distribution of vegetation coverage and land degradation in Xinjiang is the pattern with 3 Mountains nipping two basins, i. e, in the region of Ahai Mountains ,Tianshan Mountains and Kunlun Mountains, the vegetation coverage rate is higher, and the land degradation rate is lower. At opposition, in the regions of Zhunger Basin and Tarim Basin, the vegetation coverage rate is lower, and the land degradation rate is higher. This section plane is extended from the northeast to southwest in Xinjiang. In the influence of Atmospheric-circulation comes from the Arctic Ocean, the vegetation coverage rate is being declines, the land degradation rate is being rise from northwest to southeast in Xinjiang. The distribution of vegetation coverage and land degradation rate refaced the topography pattern and the water spirit comes from.
出处
《农业系统科学与综合研究》
CSCD
2008年第2期181-185,190,共6页
System Sciemces and Comprehensive Studies In Agriculture
基金
国家自然科学基金资助项目(40271052)
关键词
植被覆盖
土地退化
统计关系
空间结构
新疆
vegetation coverage
land degradation
statistic analysis
spatial distribution
Xinjiang