基于NDVI的喀斯特地区植被对气候变化的响应研究——以贵州省六盘水市为例

利用1999—2010年SPOT-VGT NDVI数据,采用基于像元的相关分析方法,分析了贵州省典型喀斯特区域植被对气候变化的响应。结果表明,1999—2010年研究区气候变化呈冷干趋势,植被NDVI呈恢复趋势;从区域尺度分析,研究区植被NDVI与气候要素间呈不显著相关关系;从像元尺度分析,植被NDVI与年均气温和降水量均具有较强的负相关性,且年均气温的影响力大于年降水量;由于植被NDVI与气候要素存在负相关,所以气候冷干的变化趋势有利于区域整体植被NDVI的恢复;植被NDVI与气候要素的相关性在空间上存在较强的地域性,进一步证明了植被NDVI对气候变化的响应受到地形的强烈影响。

A Study on Response of Vegetation to Climate Change Base on NDVI in Karst Region -A Case Study at Liupanshui City in Guizhou Province

Using SPOT-VGT NDVI data from 1999 to 2010, with the method of correlative analysis based on pixels, the response of vegetation to climate change in karst region of Guizhou Province was analyzed. The results showed that: from 1999 to 2010, the climate of the study area changed with a trend of being dry and cold and NDVI recovered. From the aspect of region, there was no significant correlation between NDVI and the climate; while from the aspect of pixels, NDVI was negatively correlated with the annual mean temperature and the annual precipitation, and the influence of annual mean temperature was less than that of the annual precipitation. As NDVI was negatively correlated with climate, the climate changing with a trend of dry and cold had an advantage of the whole vegetation NDVI recovery in the region. The correlation between vegetation NDVI and climate had a strong feature of regionalism in space, which further proved that the response of vegetation NDVI to climate change was strongly influenced by terrain.