【摘要】 利用1982—2006年GIMMS-NDVI对呼伦贝尔草原植被覆盖变化趋势进行了监测,结果表明:1)呼伦贝尔草原生长季节明显延长,且主要受返青期提前影响,与黄枯期的变化基本无关,而返青期的提前主要受春季温度升高影响;2)1982—2006年,植被总体动态变化趋势表现为略有减少,但不显著,动态变化主要为年际间的波动,且草场提前返青对草原总的生物量贡献不大;3)空间上,呼伦贝尔草原东部区域植被状况整体向好的方向发展,西部地区在向退化的方向的发展,其中呼伦贝尔沙地植被状况总体上处于微弱退化趋势,局部地区存在沙丘活化、流动性变强的现象,南部沙带退化尤为明显。更多还原

【Abstract】 A time series of GIMMS-NDVI data from 1982 to 2006 were used to monitor the vegetation cover change on Hulun Buir Grassland.The result showed that the growing season was significantly prolonged,which was mainly impacted by the early greenup date with increasing temperature in spring,and the wilting date had little effect.The trend of vegetation dynamic change decreased slightly,but not significantly,and mainly interannually from 1982 to 2006.The early greenup date contributed little to the total grass biomass.The vegetation in eastern region was greatly improved but degradated in the western region,and the sandy vegetation was degradated on the whole,especially in the southern region.Moreover,the local moving dunes became more active.更多还原