关键词: 白龙江上游, 迭部林区, NDVI, 植被覆盖度, 转移矩阵

Abstract: [Objective] Based on the Landsat satellite data in 1993, 2003, 2011 and 2015, annual change in vegetation coverage in Diebu forest area of the upper Bailong river were analyzed. [Method] The vegetation index(NDVI) and remote sensing quantitative model were used to estimate vegetation coverage. In addition, the pixels dichotomy was used to calculate vegetation coverage, decadal transfer matrix of vegetation coverage and intensity of annual variation. [Results] During the 22 years, low vegetation coverage(levelⅠ) had a total of 56.94% of transfermation. There were obvious transformations from medium to low coverage(levelⅡ) and from moderate coverage(levelⅢ) to high coverage(levelⅣ). High vegetation coverage(levelⅤ) had a relatively small change. The total area of positive transformation for each level was 1477.72km² and Ⅳ and Ⅴ levels totally had a net increase of 2225.09km². The vegetation coverage changed significantly in different ways during different periods in this region. In general, on temporal scale, both increase and decrease intensity showed a reduction and the ability to maintain stability gradually increased. Growth areas increased from continuous to scattered and regional of intergenerational expanded annually. The degraded area transformed from the dry valleys to alpine mountains gradually. [Conclusion] As a result of prohibition of harvest and ecological protection measures of the governments, vegetation coverage increased gradually to 67.48%from 1993 to 2015in this region and the vegetation was recovered obviously.

Key words: upper Bailong river, Diebu forest, NDVI, vegetation coverage, transfer matrix