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Cotton flooding and drought analysis regarding growth stages in Hubei,China,using a daily agrometeorological index

International Journal of Agricultural and Biological Engineering 2023年第4期16卷 173-183页

作者： Long Qian Cheng Chen Xiaohong Chen Wenzhi Zeng Yawen Gao Kenan Deng School of Civil Engineering Sun Yat-sen UniversityGuangzhou 510275China State Environmental Protection Key Laboratory of Environmental Health Impact Assessment of Emerging Contaminatsy Shanghai 200233China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China

Cotton yield is restricted worldwide by flooding and drought that occur across various growth stages.In this study,cotton flooding and drought in Hubei(a major cotton-production province in China)from 1961 to 2019 were analyzed regarding growth stages through a daily index named the standardized antecedent precipitation evapotranspiration index(SAPEI).In addition,the impacts of flooding and drought on cotton climatic yield were quantified using multiple regression models.The results showed that the temporal trends of cotton flooding and drought intensities were generally smooth,except for an obvious downward trend for cotton drought intensity at the flowering and boll-forming stage.Additionally,cotton drought intensity varied more drastically than that of flooding over the years.Cotton-flooding proneness was much greater than cotton-drought proneness at all growth stages,and the most flooding-prone and drought-prone periods were identified as the flowering and boll-forming stage and the budding stage,respectively.In terms of spatial distribution,northeastern Hubei and southwestern Hubei were most prone to flooding and drought,respectively.The SAPEI-based regression model(R2=0.490,pclimatic yield and that the yield-reducing effect of cotton flooding was much greater than that of drought.Moreover,when growth stages were further considered using regression analysis,only the flowering and boll-forming stage was detected with a significant yield-reducing effect of cotton flooding.In conclusion,the SAPEI can effectively assist in monitoring cotton flooding and drought;cotton flooding,especially during the flowering and boll-forming stage and that occurring in northeastern Hubei,is the key issue for cotton field water management in Hubei.

关键词： irrigation drainage climatic yield waterlogging

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