| Cite this article: | 张月,邓可楠,高雅文,等.利用累积湿润指数评估湖北棉花生育期内旱涝灾害影响[J].灌溉排水学报,0,():-. |
| Zhang Yue,Deng Kenan,Gao Yawen,et al.利用累积湿润指数评估湖北棉花生育期内旱涝灾害影响[J].灌溉排水学报,0,():-. |
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| Estimating the impacts of drought and flood disasters during cotton growth periods in Hubei Province using the accumulative humidity index |
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Zhang Yue1, Deng Kenan1, Gao Yawen1, Qian Long2, Chen Cheng3,4, Huang Taoxing5
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1.WUHAN UNIVERSITY;2.SUN YAT-SEN UNIVERSITY;3.Shanghai Investigation, Design &4.Research Institute Co., Ltd.;5.Huadong Engineering Corporation Limited, Power China
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| Abstract: |
| 【Objective】To reveal the characteristics of drought and flood disasters during cotton growth periods in Hubei Province, providing a basis for water disasters prevention and control in cotton fields.【Method】Based on daily meteorological data of 26 typical meteorological stations in Hubei Province from 1961 to 2019, the ten-day accumulative humidity index was computed. Then the variations of drought and flood events in the four major cotton growth stages (i.e., seedling stage, budding stage, flowering and boll-forming stage, and boll opening stage) were analyzed. Moreover, the correlation relationships between the drought/flood event intensity and the corresponding cotton climatic yields were revealed.【Result】In Hubei Province, except the boll opening stage of cotton, the other three cotton growth stages were confronted with upward trends of the accumulative humidity index; additionally, the greatest increasing trend appeared at the budding stage. During the seedling stage in 1964 and the boll-opening stage in 1969, significant mutations of the accumulative humidity index were detected, which referred to significantly wetter conditions and drier conditions, respectively. In comparison, there was no significant mutation at any other growth stages in any years. Flood was identified as the dominating form of the water disasters for cotton in Hubei, while drought events were with fewer times and lower intensity. Among various cotton growth stages, the seedling stage was the period at which cotton was most likely to be confronted with flood events, and the flowering and boll-forming stage was the period at which drought events most frequently occurred. For the spatial distributions of cotton flood events in terms of the disaster frequency spatial distribution, the southwest and southeast Hubei and the northwest Hubei faced high and low risk, respectively. In terms of the spatial distribution of drought frequency, the north-central Hubei and southwest Hubei faced high and low risk, respectively. According to the regression analysis result for the whole Hubei region, the flowering and boll-forming stage was the period during which cotton yield were most severely affected by the droughts and floods. Moreover, it is the only cotton growth stage during which both drought and flood indices were found significantly (p<0.05) associated with the cotton climatic yield. During this growth stage, it was also found that the negative effect of flood on cotton climatic yield was greater than drought did, implying that cotton flood disaster was more harmful than cotton drought disaster. In addition, the above-mentioned negative impacts of drought and flood event on cotton climatic yields varied with regions and growth stages. Specifically, the southwest Hubei during the budding stage, the southwest Hubei during the flowering and boll-forming stage, and the northwest Hubei during the boll opening stage were under high risk of yield reduction that caused by flood. On the other hand, the south-central and southeast Hubei at the flowering and boll-forming stage and the southeast Hubei at the boll-opening stage were under high risk of yield reduction that caused by drought.【Conclusion】The prevention and control of water disasters for Hubei cotton are expected to mainly focus on timely drainage. During the flowering and boll-forming stage, timely irrigation and drainage should be performed to avoid severe yield reduction. Additionally, drought and flood prevention work should be specifically designed for different regions, varying with the form and the timings of water disasters. |
| Key words: accumulative humidity index; cotton; drought; waterlogging; climatic yield; Hubei Province |
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