基于TM影像的广西河池市岩溶地区植被覆盖度的动态变化研究

梁钊雄; 王兮之; 魏兴琥; 汪明冲

基于TM影像的广西河池市岩溶地区植被覆盖度的动态变化研究

佛山科学技术学院

基金项目: 中国科学院西部行动计划项目（KZCX2-XB3-10）：西南喀斯特生态系统服务功能维持机理与调控技术试验示范研究

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出版历程
- 收稿日期: 2014-02-14
- 发布日期: 2014-06-25

Study of dynamic changes in fractional vegetation coverage in Hechi City in Guangxi karst regions based on TM images

Foshan University

摘要

摘要: 选取广西河池市岩溶地区1990、2000和2010年3个时相的TM影像，采用基于NDVI的像元二分模型，探讨该区植被覆盖度的时空动态变化特征及其与非岩溶区的异同。结果表明:（1）近20年来，高植被覆盖区的面积在逐渐增加，其占整个研究区域面积的比例从1990年的30.81 %增加到2010年的53.66 %，较低植被覆盖区、中度植被覆盖区和较高植被覆盖区的面积在逐渐减少，其占整个研究区域面积的比例从1990年的9.63 %、17.25 %和31.97 %下降到2010年的8.54 %、9.88 %和26.74 %。（2）近20年来，岩溶区低植被覆盖区的面积变化率比非岩溶区的大，岩溶区的面积变化率是37.74 %，非岩溶区仅为是3.28 %。而非岩溶区的较低植被覆盖区、中度植被覆盖区、较高植被覆盖区和高植被覆盖区的面积变化率则比岩溶区的要大，非岩溶区的面积变化率分别是54.30 %、57.47 %、26.75 %、75.77 %，而岩溶区的面积变化率分别是34.87 %、43.07 %、16.34 %、71.55 %。（3）1990-2000年岩溶区中较低植被覆盖区、中度植被覆盖区的面积变化幅度比2000-2010年的要大，两个时期的变化率分别是4.68 %、0.11 %和5.68 %、1.79 %。2000-2010年低植被覆盖区、较高植被覆盖区的面积变化幅度比1990-2000年的要大，两个时期的变化率分别是1.75 %、5.07 %和1.64 %、3.59 %。2000-2010年非岩溶区中高植被覆盖区的面积变化幅度比1990-2000年的大，1990-2000年的变化幅度是8.38 %，2000-2010年的变化幅度是16.04 %。岩溶区与非岩溶区植被覆盖度变化的这种差异，主要由于两者间的岩性条件不同所引起。
- TM /
- 像元二分模型 /
- NDVI /
- 植被覆盖度 /
- 河池
Abstract: Hechi City is located in northwest Guangxi Province, one of the most famous karst regions in southwest China with high temperature and precipitation. The area's upper Paleozoic Devonian, Carboniferous, Permian and Triassic carbonate sedimentary rocks have a total thickness of nearly 10,000 meters. The karst topography in Hechi is well developed, concentrated and morphologically diverse. Three periods of the Landsat TM images were selected (1900, 2000 and 2010) to investigate space-time dynamic changes in the fractional vegetation coverage and changes in the karst and non-karst regions, delineation of the different vegetation cover and their change in area according to the dimidiate pixel model based on NDVI. It was shown that during the 20 year period from 1990 to 2010, the area of high vegetation coverage increased from 30.81 % to 53.66 % of the total study area. However, the medium-low, medium and medium-high fractional vegetation coverage areas decreased from 9.63 % to 8.54 %, 17.25 % to 9.88 %, and 31.97 % to 26.74 % respectively during the same period. This shows that, over nearly 20 years, returning farmland to forests in karst regions has been an effective rocky desertification control measure. The change in the area of low fractional vegetation coverage was greater in the karst districts than in the non-karst districts, with change rates of 37.74 % in karst and 3.28 % in non-karst over nearly 20 years. But changes in the area of medinm-low, medium, medium-high and high fractional vegetation coverage were greater in non-karst than in karst, with change rates of 54.3 %, 57.47 %, 26.75 %, 75.77 % in non-karst and 34.84 %, 43.07 %, 16.34 %, 71.55 % in karst. The change in the area of medinm-low and medium fractional vegetation coverage from 1990-2000 was greater than that from 2000-2010, with the change rates of 4.68 %, 0.11 % and 5.68 %, 1.79 % for these two periods. But the change in the area of low and medium-high fractional vegetation coverage from 2000 to 2010 was greater than that from 1990 to 2000, with the change rates of 1.75 %, 5.07 % and 1.64 %, 3.59 % in these two periods. In non-karst, the change in the area of high vegetation coverage from 2000 to 2010 was greater than that from 1990 to 2000, with change rates of 8.38 % from 1990 to 2000 and 16.04 % from 2000 to 2010. The differences in the change of vegetation fraction between karst district and non-karst district are mainly due to differences in lithological conditions.
- TM /
- dimidiate pixel model /
- NDVI /
- vegetation fraction /
- Hechi

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