摘要
利用蒙古高原1982-2010年生长季NDVI数据序列和同期温度和降水量数据,研究过去29年间蒙古高原植被覆盖对气候变化的响应模式及其年际和季节变化趋势。结果表明:(1)尽管1982-2010年蒙古高原各季节植被覆盖变化大小各不相同,但生长季植被覆盖度总体变化呈增加趋势(0.0003/a)。最大值出现在1994年,1994年之前主要以增加为主,而后以下降为主,与降水量的变化趋势和波动高度一致。气候的暖干化发展趋势是导致蒙古高原植被覆盖变化趋势发生转折的最直接原因。(2)各季节的NDVI分别经历了不同的转折时间,春夏秋季分别为2002年、1994年和1998年,表明春季植被的持续增加趋势最为明显。(3)不同植被类型的NDVI变化趋势表明,草原、森林植被变化趋势的转折分别为1994年和1997年,而灌丛和农田均为1998年,但存在明显的季节差异。与气候因子的相关关系看,温度对高原森林植被的生长有促进作用,降水是草原植被覆盖变化的决定因素,而灌丛和农田来讲,温度和降水量对植被生长的综合作用较明显。
Based on the NDVI data sequence,synchronic temperature and precipitation data of the Mongolian Plateau from 1982 to 2010,the response pattern of the vegetation cover to the climatic change and the annual and seasonal changing trend in the past 29 years have been studied. The results show：（ 1） Although the vegetation cover in the Mongolian Plateau varied in each season from 1982 to 2010,the overall change of vegetation coverage in growing season was in an increasing trend（ 0. 0003/a）. The maximum value was in 1994,with increasing before1994 and decreasing after 1994,which changed with the changing trend and fluctuation of precipitation consistently. The warming and drying climate in recent decade is the direct reason for the transition of NDVI trend in Mongolian Plateau.（ 2） There was different transition time for NDVI in each season which was in 2002,1994 and 1998 for spring,summer and autumn,indicating that the continued increasing trend of NDVI in spring was significant.（ 3） According to the changing trend of NDVI for different vegetation types,the transition of grassland and forest vegetation was in 1994 and 1997,the one of shrubs and farmland was in 1998,with obvious seasonal differences.In terms of the correlation with climatic factors,temperature can promote the growth of vegetation in the Plateau.Precipitation is the decisive factor for the change of grassland vegetation cover. For shrubs and farmland,temperature and precipitation influence the growth of vegetation more obviously.
出处
《内蒙古林业科技》
2017年第4期30-34,共5页
Journal of Inner Mongolia Forestry Science and Technology
关键词
蒙古高原
植被覆盖
NDVI
季节变化
气候
Mongolian Plateau
vegetation cover
NDIV
seasonal variation
climate
