Hydrology and Land Surface Studies
NDVI-indicated decline in desertification in China in the past two decades
Article first published online: 17 MAR 2005
Copyright 2005 by the American Geophysical Union.
Geophysical Research Letters
Volume 32, Issue 6, March 2005
How to Cite
2005), NDVI-indicated decline in desertification in China in the past two decades, Geophys. Res. Lett., 32, L06402, doi:10.1029/2004GL021764., , , and (
- Issue published online: 17 MAR 2005
- Article first published online: 17 MAR 2005
- Manuscript Accepted: 21 FEB 2005
- Manuscript Revised: 10 JAN 2005
- Manuscript Received: 15 OCT 2004
 In this study, we explore the trend in desertification in China from 1982 to 1999 by investigating the changes in area and normalized difference vegetation index (NDVI) of arid and semiarid regions, using NDVI time series data sets and climatic variables. We use Thornthwaite moisture index (Im) to define the arid and semiarid region as Im ≤ −40 and −40 < Im ≤ −20, respectively. Rainy season NDVI (May to October NDVI) increased in most areas of arid and semiarid regions over the past two decades, accounting for 72.3% and 88.2% of total area of arid and semiarid regions, respectively. Compared to that in the early 1980s, the area of arid and semiarid regions decreased by 23 × 104 km2 (6.9%) and 7 × 104 km2 (7.9%) by the end of the 1990s, suggesting a reversal of desertification processes in these two climate regions. Transformation from warm-arid to warm-wet climate and weakened disturbance from human activities may be the major causes of this declined trend.