Analysis of spatial-temporal evolution of agricultural drought based on regional agricultural drought index

Abstract

a b s t r a c tIn recent years, the frequency and intensity of drought in China are on the rise, and most of the major grain producing provinces are situated in the drought-prone areas, so agricultural drought has become one of the main factors restricting the agricultural production in China. In this paper, with Henan province being taken as the research area, the change trend of agricultural drought area of Henan province was analyzed, and the spatial-temporal evolution characteristics of Henan province were evaluated based on the regional agricultural drought index. The research showed that the inter-annual change of agricultural drought index showed a decreasing trend year by year (tendency rate was -0.12/10a), indicating that the drought degree decreased year by year. The east and south of North Henan, east and north of Eastern Henan, and north and east of Central Henan were mild drought-prone areas; the east of Western Henan, west and north of North Henan, and west of Central Henan were moderate drought-prone areas; the west of North Henan, west of Western Henan, and north of South Henan were severe drought-prone areas.

Temporal and Spatial Characteristics of Agricultural Drought Based on the TVDI in Henan Province, China

“…In this study, it was found that agricultural drought in Henan Province showed an increasing trend on the whole, and drought was more serious in northern Henan Province and lighter in eastern southern Henan Province, which was consistent with the analysis results of Henan drought by Lu et al [39] based on SPEI and Shang et al [40] based on SPI. Comprehensive analysis shows that regional agricultural drought in Henan Province mainly occurs in northern Henan, central Henan and eastern Henan, which is basically consistent with the analysis results of drought characteristics in Henan Province by Wang et al [41], Li et al [42] and Wang et al [43]. In terms of seasonal scale, spring and autumn are two seasons characterized by frequent droughts, which is in line with the findings of Liu et al [38].…”