关键词: 综合涝渍指数, 综合风险评估, 玉米涝渍灾害

Abstract:

Extreme precipitation events occur frequently during maize growing season (late April to early October) in Jilin province, leading to frequent waterlogging disaster that significantly affect maize growth, harvesting and ultimately yields and degraded quality. This study integrated the atmosphere−soil−crop continuum system, utilizing the crop water stress index (CWSDI), vegetation condition index (VCI) and soil moisture condition index (SMCI) to construct a comprehensive waterlogging index (CWI) for maize. Based on the four−factor theory of disaster formation, a comprehensive waterlogging risk assessment model was established to evaluate the integrated risk of maize waterlogging disaster in Jilin province from 1990 to 2022. The results indicated: (1) the CWI during the jointing−silking stage of maize in Jilin province reached as high as 0.98 in 1990−2022, with high−value areas primarily concentrated in the central and southeastern regions of Jilin province. (2) The waterlogging disaster hazards during the maize sowing−jointing, jointing−silking and silking−maturity stage in Jilin province showed an increasing trend from west to east in 1990−2022. Of these, the maize jointing−silking stage had the largest proportion of areas at severe risk, accounting for approximately 28.3% of the total provincial area. (3) The high−risk areas of maize waterlogging disaster in Jilin province were primarily concentrated in the central and southeastern regions from 1990 to 2022, the jointing−silking stage exhibited the largest area of severe risk and above, accounting for approximately 47.9% of the total provincial area. 

Key words: Comprehensive waterlogging index, Comprehensive risk assessment, Maize waterlogging disaster