Comparison of the Vegetation Condition Index with Meteorological Drought Indices: A Case Study in Henan Province
The relationships between satellite-based vegetation condition index (VCI) and a number of frequently used meteorological drought indices,including meteorological drought composite index (CI),K drought index (K),the percentage of precipitation anomalies (Pa),standard precipitation index (SPI),Z-index (Z),Palmer drought severity index (PDSI) were evaluated by using long-term monthly data in Henan Province from 1982 to 2006 in this paper.The temporal lags between VCI and meteorological indices and the capabilities of using VCI to monitor drought is also discussed.The results show that:1) Underlying surface has an impact on the correlations between VCI and meteorological indices.The correlation of VCI with mete orological drought indices of cropland is higher than that of woodland.There is a positive correlation between VCI and meteorological drought indices on cropland.2) There are differences in the temporal lags during different growing stage of crops.During over-winter stage of winter wheat,the lag is one to three months.During summer corn stage,it is one month.The affection of meteorological condition to summer corn is inferior than that to winter wheat.Overall,combining with prophase meteorological condition,VCI is able to indicate meteorological drought and to monitor drought in the province.
vegetation condition index (VCI)drought monitoringland-useHenan Province
NETL
NSTL
万方数据
维普
