Abstract
Abstract. The temporal and spatial variations of drought in the Wei River basin (WRB)
were investigated by calculating the meteorological drought Index
(Standardized Precipitation Index, SPI) and the agricultural drought index
(Vegetation Health Index, VHI). Monthly precipitation and air temperature
were from 22 meteorological stations over the region from 1960 to 2015.
Monthly Normalized Difference Vegetation Index (NDVI) and 8-days Land Surface
Temperature (LST) were provided from the National Aeronautics and Space
Administration (NASA) for the period 2000–2015 were also adopted. The
results showed that the drought initially increased and then decreased,
reaching at the maximum value in 1990s. The spatial pattern of meteorological
drought showed that the drought in northern WRB was heavier than that in
southern WRB before 1990s, after that, the situation had the opposite. By
comparing the agricultural drought index (VHI) with crop yield, it was proved
that VHI was applicable in the WRB and could well reflect the fluctuation of
agricultural drought. The WRB suffered from serious agricultural drought in
2000, 2001, 2007 and 2008. Through analysis of the historical precipitation
and temperature data, it was found that precipitation had a greater
contribution to creating agricultural drought conditions than temperature in
the Wei River basin.
Funder
National Natural Science Foundation of China
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