Application of AWTP Index to the Agricultural Drought in Guangxi
Based on the daily rainfall data from 1961 to 2007 at 32 stations in Guangxi, the spatial and temporal evolutions of the agricultural drought events in Guangxi were analyzed using the average waiting time for precipitation(AWTP) as drought index. Climatologically, the equivalent dry period is the longest in autumn, followed by winter, spring and summer. The dominant time scales of the seasonal equivalent dry period are both interannual and interdecadal changes in spring and summer. In autumn and winter,there also exist remarkable increasing longterm-trend in the equivalent dry period, in addiction to the significant interannual and interdecadal variations. However, the increasing trend rate of the equivalent dry period in autumn is the largest in other seasons. The district-wide drought is a dominant pattern in all seasons in Guangxi. There are higher agricutural drought frequencies in autumn and winter than in other seasons. Under the background of global warming, the agricultural drought frequency has an increasing trend in Guangxi.
Guangxi ProvinceEquivalent dry periodAWTP indexAgricultural droughtSpatial and temporal distribution characteristics
NETL
NSTL
万方数据
维普
