贵州省黔南州植被覆盖时空变化分析

Spatio-temporal Changes Analysis of Vegetation Coverage in Qiannan Prefecture of Guizhou Province

基于MODIS数据,采用阈值设定、一元线性回归分析和稳定性分析等方法,对黔南州近15 a来的植被覆盖状况进行分析研究。结果表明,黔南州植被NDVI值呈上升趋势,植被覆盖状况有所改善,但植被覆盖总面积在减少,植被覆盖的空间分布不均。西部地区的植被NDVI值在提高,植被覆盖状况呈改善趋势;而东部地区的NDVI值在降低,植被覆盖状况呈下降趋势:黔南州的西部和北部地区属于农作物种植区,植被覆盖状况不稳定,植被NDVI值变化大,而东南部地区属于林地,植被覆盖状况稳定;黔南州植被覆盖面积年内变化大;植被覆盖面积变化受气候变化和建设用地面积扩大的影响。

In this paper,based on the MODIS data from 2000 to 2014,we used NDVI threshold setting,NDVI linear regression analysis and NDVI stability analysis to analyze the vegetation coverage changes in Qiannan Prefecture.The results show that the NDVI value of vegetation in Qiannan Prefecture is increasing,and the vegetation coverage is improving,while the total area of vegetation coverage is decreasing.The vegetation coverage is unevenly distributed,the NDVI value of vegetation in the western region is increasing,and vegetation coverage is improving.While NDVI value is decreasing in the eastern region,and the vegetation coverage is declining.The crop planting areas are greater in western and northern areas,the vegetation coverage status is unstable and the NDVI value of the vegetation changed greatly.While the forest area is great in southeast area and the vegetation coverage is stable.Vegetation coverage change is impacted by climate change and construction area large.