基于MODIS的2008-2017年青岛市植被覆盖度动态变化分析

Dynamic Change Analysis of Vegetation Coverage in Qingdao City Based on MODIS during 2008-2017

以青岛市2008年、2012年和2017年3个时期的MODIS植被指数产品为数据源,利用基于归一化植被指数(NDVI)的像元二分模型提取了植被覆盖度信息,分析了青岛市近十年的植被覆盖度变化以及与气候、人类活动等因素的关系。研究结果表明,近十年间青岛市的植被覆盖度在整体上是呈现下降趋势的,植被覆盖度大于0.6的区域所占比例由2008年的75.45%降到2017年的61.38%,植被覆盖度增加的区域仅占10.95%,而降低区域却占到22.14%。降水量的减少、气温的变化等自然因素以及人类活动、政策变化等人为因素是造成青岛市植被覆盖度变化的主要原因。

With the MODIS vegetation index products of Qingdao in 2008, 2012 and 2017 as data source, vegetation coverage information was extracted using a dimidiate pixel model based on Normalized Difference Vegetation Index （NDVI）. And the changes of vegetation coverage degree and the relationship with climate, human activities and other factors were analyzed in the last ten years of Qingdao. The results show that the vegetation coverage of Qingdao in the past decade has shown a downward trend as a whole. The proportion of the area with vegetation coverage greater than 0.6 decreased from 75.45% in 2008 to 61.38% in 2017, and the vegetation coverage increased. The area only ac- counts for 10.95%, while the reduced area accounts for 22.14%. Natural factors such as the decrease of precipitation, changes in temperature, and human factors such as human activities and policy changes are the main causes of changes in vegetation coverage in Qingdao.