摘要
利用2001—2015年的MODIS NDVI数据和同期气象数据,分别在年际和月际尺度上分析林地、草地、耕地和其他用地NDVI的变化及其对气候变化的响应特征。结果表明:1)内蒙古地区的NDVI存在明显的地域性差异,总体呈现由东到西递减的特征; 2)内蒙古地区NDVI整体呈增长趋势,增长率由高到低依次为:耕地、草地、林地和其他用地; 3)近15年中,内蒙古地区整体呈现降水增多的趋势,温度变化不明显; 4)年际尺度上,降水对内蒙古地区NDVI年际变化起决定作用; 5)月际尺度上,年内植被NDVI变化受降水和温度的共同影响,草地和耕地NDVI对降水和温度的响应均存在时滞效应,而林地和其他用地仅对温度的响应有一定的时滞性。
Using the 2001-2015 MODIS NDVI datasets along with the meteorological data(temperature and precipitation), we analyzed the correlations of NDVI in different vegetation types(woodland, grassland, cultivated land, and other land) with meteorological factors at different temporal scales. The results indicated significant regional differences of NDVI in Inner Mongolia, and NDVI overall decreased from the east to the west. The woodland had the highest NDVI, followed by the cultivated land, grassland, and other land. During the study period, NDVI in Inner Mongolia exhibited an obvious recovering trend, and the decreasing order of the rate was: cultivated land>grassland>woodland>other land. In recent 15 years, the precipitation in Inner Mongolia showed an increasing trend, whereas the change in temperature was not obvious. At yearly scale, precipitation played a decisive role for the annual change in NDVI in Inner Mongolia, which meant the increase of precipitation promoted the growth of vegetation. At monthly scale, NDVI of vegetation was influenced by both precipitation and temperature. The responses of NDVI to precipitation and temperature in grassland and cultivated land all had some time lags, while those in woodland and other land merely showed time lags to temperature.
作者
李舒婷
周艺
王世新
尚明
杨宝林
LI Shuting;ZHOU Yi;WANG Shixin;SHANG Ming;YANG Baolin(Institute of Remote Sensing and Digital Earth,Chinese Academy of Sciences,Beijing 100101,China;College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《中国科学院大学学报（中英文）》
CSCD
北大核心
2019年第1期48-55,共8页
Journal of University of Chinese Academy of Sciences
基金
高分辨率对地观测系统重大专项(00-Y30B14-9001-14/16)资助
关键词
内蒙古
NDVI
气候变化
时空变化
相关性
Inner Mongolia
NDVI
climate change
spatial-temporal change
correlation
