为掌握蒙古国植被长势状况,以中蒙边界蒙古国一侧400 km宽范围为监测对象,以SPOT VEGETATION、MODIS Land Cover、MODIS NPP为数据源,对该区域近10年植被变化进行监测分析.结果表明,植被初级生产力比较低,主要以NPP ＜500 g/(cm2·a)为主;2000年NPP ＜500 g/(cm2·a)的区域占总面积的45.6％,2010年占46.06％,植被长势变差;2010年灌丛、水体、耕地、未利用地、林地面积比2001年分别减少了16 533.2、878.6、19 920.8、103 265、287.9 km2.2005 ～ 2010年段土地利用动态度全部高于2001～2005年段,土地利用类型变化速度加快.2005年中部偏东区降水量的减少是植被覆盖度和NPP降低的主要因素,2005、2010年的西北部是研究区土地利用方式变化最多、灌丛退化最严重的区域,2010年的中部偏东区由于农田的大幅度减少、农作物的减少,人类活动是导致两个区域植被覆盖度下降和NPP减少的主要因素.%To master the growth vigor of vegetation in Mongolia,400km wide range on one side of Mongolia was monitored and analyzed by using SPOT VEGETATION,MODIS Land Cover as well as MODIS NPP in the recent 10 years.The results showed that the vegetation productivity was relatively low,mainly ＜500 g/(cm2 · a).Region ofNPP＜500 g/(cm2 · a) accounted for 45.6％ of the total area in 2000 and that of 2010 accounted for 46.06％,which indicated that the growth of vegetation decreased.Comparing with 2001,area of shrub,water,farmland,unused land as well as forest in 2010 respectively reduced by 16 533.2,878.6,19 920.8,103 265,287.9 km2.Dynamic degree of land use during 2005-2010 years were all higher than those of 2001-2005 years.With the rapid changes of land use,human activity enhanced.In short north to the middle of study area,the main decreased factor of vegetation coverage and NPP in 2005 was the reduction of precipitation,but in 2010 the reason was the transformation from farmland to grassland.In northwest,land use from 2000 to 2010 changed greatly,the shrub was transformed to grassland,human activity was the reason of the decrease of vegetation coverage and NPP reduction.
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