鄂尔多斯高原1982-2006年植被变化及其驱动因子

植被变化对全球气候变化的响应是近年来生态学研究的热点问题。鄂尔多斯高原地处中国西部生态敏感地带,研究该区域植被变化及其对气候变化的响应具有重要意义。利用1982—2006年的NO-AA/AVHRR NDVI数据和当地同期气象资料,研究了鄂尔多斯高原地区植被覆盖变化及其与气象因子的关系。结果表明:(1)1982—2006年鄂尔多斯高原全年平均NDVI显著增加(p=0.001 7),增加率为每年0.04%,平均温度也在显著增加(p<0.001),平均降水波动大但没有显著趋势(p>0.05);(2)鄂尔多斯高原植被NDVI增加的主要区域是典型草原,其春、夏、秋3季的季节平均NDVI都显著增加(p<0.001);(3)鄂尔多斯高原植被NDVI在生长阶段增加的主要驱动因子是降水,非生长阶段的变化主要是由温度引起的。

Variation of Vegetation and Its Driving Factors in Erdos Plateau from 1982to 2006

The responses of vegetation variation to global climate change have become a hot issue in ecological research recently.The Erdos Plateau is located in the eco-sensitive zone of West China and its vegetation variation responding to global climate change is of great importance.We used the NOAA/AVHRR NDVI data from 1982 to 2006 and local meteorological records during corresponding time of the Erdos Plateau to analyze the vegetation variations and its relationship with meteorological parameters.Results showed that(1) from 1982 to 2006,annual mean NDVI of the Erdos Plateau increased significantly(p=0.001 7),with an increasing rate being 0.04% per year,and the mean temperature also increased significantly(p<0.001) while the mean precipitation varied significantly with no clear trend(p>0.05);(2) in the Erdos Plateau,the NDVI increment was mainly contributed from the typical steppe whose seasonal average NDVI in spring,summer and autumn all increased significantly(p<0.001);(3) in the growing season of the Erdos Plateau,the main driving factor for the increment of NDVI was precipitation,while in the non-growing season,it was temperature.