Drought Characteristics in the Field Period of Flue-Cured Tobacco in Western Henan and Its Impact on Meteorological Yield

Cai Tao; Liu Xiaoying

doi:10.16765/j.cnki.1673-7148.2025.04.006

Abstract：Using the daily meteorological data of flue-cured tobacco field period from 1981 to 2022 at 12 meteorological stations in western Henan Province and taking the Standardized Antecedent Precipi-tation Evapotranspiration Index(SAPEI)as the drought index of flue-cured tobacco,this paper analyzes the temporal and spatial distribution characteristics of drought in the flue-cured tobacco field period in western Henan and divides different grades of drought climate risks.Moreover,based on the flue-cured tobacco yield per unit area at two representative stations from 1981 to 2022,the impact of drought in dif-ferent periods on meteorological yield of flue-cured tobacco is analyzed.The results show that the occur-rence frequencies of light,moderate,and severe droughts in the root elongation period of flue-cured to-bacco in western Henan are 20％,16％,and 6％,respectively.The occurrence frequencies of light,moderate and severe droughts in its vigorous growth period are 13％,12％,and 11％,respectively.The occurrence frequencies of light,moderate,and severe droughts in its maturing period are 12％,7％,and 6％.respectively.Spatially,the drought frequency shows a distribution characteristic of high in the east and low in the west in the root elongation period,high in the west and low in the east in the vigorous growth period and maturing period.The drought climate risk indices are 44.4,44.1,and 27.8 respec-tively in the root elongation period,vigorous growth period and maturing period.In terms of inter-annual variation,the root elongation period and maturing period show an upward trend at a rate of 7.5/decade and 4.8/decade,respectively,but the vigorous growth period has a downward trend at a rate of-1.1/decade.The study area is divided into different levels of drought climate risk areas according to the drought climate risk indices.In the root elongation period,Xin'an and Mengjin are the primary high-risk areas,while Mianchi,south of Yiyang,Songxian and Ruyang are the sub-high-risk areas,with other places as medium-risk areas basically.In the vigorous growth period,Lingbao is the high-risk area,while Shaanxian,Ruyang and north of Lushi,northwest of Luoning are the sub-high-risk areas,and other places belong to medium-risk areas.In the maturing period,all these places become low-risk and sub-low-risk areas.SAPEI has a significantly positive correlation with meteorological yield of flue-cured to-bacco in mid-May and from late June to early July(P＜0.05),which means that drought condition in these two periods has the most significant impact on the flue-cured tobacco meteorological yield.