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以平潭岛作为研究区,运用线性混合像元分解法从遥感影像中反演1992年、2002年和2013年3个时相植被覆盖度,用数字高程模型(DEM)提取坡度、坡向和高程数据.将植被覆盖度与3种地形因子进行空间叠加分析,以研究该海岛植被长势与地形间的联系,对生态环境保护提供参考建议.研究结果表明:在平潭岛的平坦和缓坡地区,以低植被覆盖度为主,随着坡度上升,高植被覆盖度面积比例增加,在25°~35°坡度范围达到峰值,最后又下降.坡向对研究区植被覆盖度的影响微弱,不是主导植被长势的重要地形因子.低高程区的植被覆盖度低,高程变大,植被覆盖度也增大,在高程大于310 m的地区,受热量降低影响,植被覆盖度下降.后10 a植被下降较前10 a明显,虽有山区植被改善,但是建设区和地势低平区破坏越来越严重,需重点治理.
Taking Pingtan Island as the research area, the linear mixed pixel decomposition method was used to retrieve the vegetation coverage of the three phases in 1992, 2002 and 2013 from the remote sensing images. The digital elevation model (DEM) was used to extract the slope, aspect and Elevation Data The spatial overlaying analysis of vegetation coverage and three kinds of topographical factors is carried out to study the relationship between the vegetation growth and topography of the island and to provide reference for the protection of ecological environment.The results show that in the flat and gentle slope area , With low vegetation coverage as the slope increased, the proportion of high vegetation coverage increased, peaked at the slope of 25 ° ~ 35 °, and finally decreased.The influence of slope on the vegetation coverage in the study area was weak, not The dominant topographic factors dominate the vegetation.The vegetation coverage in the low elevation area is low and the elevation is higher and the vegetation coverage also increases.When the elevation is greater than 310 m, Compared with the previous 10 a, it is obvious that despite the improvement of vegetation in mountainous areas, the destruction of the construction area and low-lying terrain is more and more serious, and the key management is needed.