利用2种植被指数监测中国6种典型森林生长期的比较研究

摘要

针对大区域森林植被生长变化规律的应用需求，采用统计分析的方法，利用选取的EVI和NDVI两种植被指对中国6种典型森林2000-2011年的生长期变化进行监测，并对监测结果进行了比较。结果表明，从提取的生长期拐点的出现时间及生长期的变化趋势可知，2种植被指数提取的6种典型森林的生长变化时间范围基本相同，都能较好地反映森林生长期的变化过程，说明利用植被指数进行森林生长期监测的方法是可行的；但对高森林植被覆盖区域的森林植被变化及对云等干扰因素的敏感性来看，EVI比NDVI更适合用于大区域空间范围、多种类型的森林植被变化的监测。%To study the growth variation of the large regional forest vegetation,this paper selected two vegetation indices data-EVI and NDVI to monitor the changes of growth period from 2000 to 201 1 in six typical forests in China,then compared the results by using the statistical analysis.The results show that from the growing trend and the time when growing season appeared,the time range of growth changes extracted from two kinds of vegetation indi-ces are basically the same in the six typical forest types and could perfectly reflect the process of change of forest growing season.This indicates that the method of using vegetation index to monitor forest growing season is feasible. EVI is more effective to the changes of forest vegetation for high forest coverage area and less sensitive to disturbances such as cloud.In conclusion,EVI is more suitable for monitoring the changes in the forest which has various types′forest vegetation in large area space than NDVI.