云南石林县植被覆盖变化的时空特征
The Space-Time Characteristics of Vegetation Cover Change in Shilin County, Yunnan Province

为了解云南石林县的植被覆盖度变化时空特征，选用Landsat7 ETM SLC和Landsat8 OLI的遥感影像数据，运用ENVI和ArcGIS计算得到石林县的植被覆盖度并对其动态变化进行相应分析。结果表明：1) 2000年石林县的NDVI平均值为0.6967，而2015年石林县的NDVI平均值为0.7549，15年间增长了5.8%。2) 在空间上：石林风景区及县城周边的植被覆盖度较同期其他区域的植被覆盖度低，高海拔地区的植被覆盖度较同期其他区域的植被覆盖度高。3) 植被覆盖度下降的植被覆盖区有中度植被覆盖区，下降了0.6%，中高植被覆盖区下降了17.9%；高植被覆盖区上升了18.5%；植被由低植被覆盖度向高植被覆盖度演变。4) 植被覆盖度提高的原因有三点：退耕还林工程的实施、沼气池、煤气和电的使用及喀斯特地区的生态治理。
In order to understand the time-space characteristics of the change of vegetation coverage in Shilin County, Yunnan Province, the remote sensing image data of Landsat7 ETM SLC and Landsat8 OLI were selected, and the vegetation coverage of Shilin County was calculated by ENVI and ArcGIS and its dynamic changes were analyzed accordingly. The results showed that: 1) The average NDVI in Shilin County in 2000 was 0.6967, compared with the average NDVI of Shilin County in 2015 was 0.7549, an increase of 5.8% in 15 years. 2) In space: vegetation cover in Shilin Scenic Area and sur-rounding county towns is lower than in other areas during the same period, and vegetation cover in high altitude areas is higher than in other areas during the same period. 3) The vegetation cover area with decreased vegetation coverage decreased by 0.6%, the medium-high vegetation cover decreased by 17.9%, the high vegetation cover area increased by 18.5%, and the vegetation evolved from low vegetation cover to high vegetation cover. 4) There are three reasons for the im-provement of vegetation cover: the implementation of the project to return to the forest, the use of biogas digesters, gas and electricity, and ecological management in the Karst area.