【摘要】 基于NOAA和MOD IS数据,以生长季累计NDVI为植被表征指标,采用基于像元的趋势分析方法,对过去近30年内蒙古自治区的植被变化进行了系统分析(分为1983～1999年和2000～2009年两个时段),确定了植被发生趋势性变化的区域,并利用气候和社会经济统计资料确定了影响植被变化的主要因素。研究结果表明:近30年来,内蒙古自治区72.1%的地区植被未发生明显的趋势性变化;5.5%的地区(科尔沁沙地以南和鄂尔多斯东北部)植被状况两个时期均持续好转,13.9%的地区(锡林郭勒盟草原、科尔沁沙地以南、后套平原和土默川平原)植被前期好转,后期一直保持平稳状态;0.6%的地区(科尔沁沙地北部)植被前期变差,后期无明显变化趋势;1.8%的地区(大青山山脉北侧的乌盟后山及大兴安岭的部分地区)植被前期未发生明显变化,后期明显变差。除锡林郭勒植被好转和大青山山脉北侧的乌盟后山地区植被变差主要受降水影响外,研究期内植被活动显著增强的大部分地区主要受人为因素的影响。西辽河沿岸平原、土默川平原、后套平原、科尔沁沙地以南等耕作区的植被变化主要与农作物产量的变化有关,鄂尔多斯地区和乌兰布和沙漠东部边缘的磴口县等草原区NDVI的显著增加与区域草原开垦、持续植树种草、禁牧轮牧等防沙治沙等活动有关,大兴安岭部分地区的NDVI显著减少与森林火灾有关。更多还原

【Abstract】 This paper presented regional trends in vegetation greenness in Inner Mongolia Autonomous Region during the period of 1983～1999 and 2000-2009 based on NOAA and MODIS data.The relationship between vegetation greenness change and climatic and anthropogenic factors were also explored based on the analyses of meteorological data and local economic statistical data.The results were as follows: 1) 72.1% of the study area experienced no significant change over two study period at the 0.05 level while 5.5%(including south of Horqin sandy land and northeast of Muus sandy land)increased during both periods.In 13.9%(including Xilingol League,South of Horqin,Tumo Plain etc) of the area vegetation showed increase tendency during 1983-1999 and remained constant during 2000-2009.In 0.6%(including north of Horqin sandy land) of the whole area vegetation decreased during 1983-1999 and showed no significant trend later.In 1.8% of the study area(including part of Wumeng mountain and the Great Xing’an Mountain) vegetation had no significant trend during 1983～1999 but deceased clearly during 2000-2009.2) The increasing greenness showed no positive link with precipitation in the study area excluding part of Xilingol League while the increasing trend of vegetation was mainly affected by human activities.The increase of the crop yield was responsible for the significant increase of vegetation greenness in the Xiliaohe Plain,Tumote Plain etc where the main land use type was crop land while in northwest of Muus sandy land where vegetation increased clearly,the causes were the human activities such as planting trees,dune management.In part of the Great Xing’an Mountain where NDVI decrease was related to forest fires.更多还原