摘要
利用增强型植被指数(EVI)作为植被活动的指标,用MODIS-EVI时间序列数据定量分析了2000～2009年间中国北方地区EVI的变化规律。结果表明:1)21世纪初中国北方地区植被覆盖总体改善,局部退化,10年来区域年平均EVI增加5.97%;2)逐季节平均EVI均呈现上升趋势,春季、秋季上升幅度小,夏季、冬季上升幅度大;3)中国北方地区植被稀少的区域呈减少趋势,同时单位面积EVI增加,植被生长更加茂盛;4)中国北方地区EVI变化空间异质性大。东北平原、华北平原、黄土高原和新疆农业区显著增加,东北和西部部分地区植被退化。
Moderate-resolution Imaging Spectroradiometer （MODIS）-Enhanced Vegetation Index （EVI） data reported during 2000-2009 have been analyzed to study recent trends in vegetation greenness over the northern part of China at the beginning of the 21 st century. The results showed that the afforestation area was larger than the degraded area in the northern part of China during the last 10 years, and the regional total mean annual EVI increased by 5.97%. Seasonal EVI increased significantly, and trends in summer and winter were larger than those in spring and autumn. The sparsely vegetated area declined, unit area EVI increased, and vegetation activity rose during the study period. In addition, EVI changes in the northern part of China exhibited relatively large spatial heterogeneity. The Northeast China Plain, North China Plain, Loess Plateau, and Xinjiang agriculture regions experienced marked increases, and part of Northeast China and West China experienced declining trends. Such patterns are attributed primarily to regional climate changes and human activities such as ecological construction and urbanization.
出处
《气候与环境研究》
CSCD
北大核心
2013年第2期156-164,共9页
Climatic and Environmental Research
基金
全球变化研究国家重大科学研究计划项目2012CB956203
国家重点基础研究发展计划项目2012CB955700
2010CB950900
中国科学院知识创新工程重要方向项目KZCX2-EW-202-3
