| Cite this article: | 蒙华月,吴雨箫,钱 龙,等.湖北省棉花生育期内涝渍高温灾害特征分析[J].灌溉排水学报,2022,():-. |
| MENG Huayue,WU Yuxiao,QIAN Long,et al.湖北省棉花生育期内涝渍高温灾害特征分析[J].灌溉排水学报,2022,():-. |
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| Spatio-temporal variations of waterlogging and high temperatures during cotton growth periods in Hubei province, China |
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MENG Huayue1, WU Yuxiao1, QIAN Long2, LUO Yunying3, CHEN Cheng4, XU Min1, DENG Jingyao1
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1.School of Water Resources and Hydropower Engineering,Wuhan University;2.School of Civil Engineering,Sun Yat-sen University;3.Guangzhou Hydraulic Research Institute (Technical Advisory Service Center for Secondary Water Supply of Guangzhou);4.Shanghai Academy of Environmental Sciences
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| Abstract: |
| 【Objective】The present work was performed to reveal the spatial and temporal characteristics of waterlogging events (WL), high temperatures events (HT), and waterlogging events followed by high temperatures events (WL-HT) during different cotton growth stages in Hubei province, so as to provide guidance for local cotton drainage scheduling under increasing climate change.【Method】Based on daily data of precipitations and air temperatures from the 26 national-level meteorological stations located in Hubei province, the number of WL, HT, and WL-HT, as well as the conversion rate (%) from WL to WL-HT (hereafter referred as the conversion rate of WL-HT) was computed at four cotton growth stages, including the seedling stage, the budding stage, the flowering and boll-filling stage, and the boll opening stage. Then, various statistical methods, e.g., the linear temporal trend method, the moving t-test, and the inverse distance interpolation, were employed to reveal the spatial-temporal variations of different indicators of the disasters in Hubei.【Result】In the last six decades, the number of WL significantly (p<0.05) increased at the budding stage; the number of WL-ET significantly increased at the flowering and boll-filling stage and at the whole growth period. Moreover, the conversion rate of WL-HT also showed significant increasing trend over the whole cotton growth period. From the aspect of variations in decades, the occurrence of HT and WL-HT showed similar trends: both of them occurred least frequently in the 1980s and occurred most frequently in the 2000s. More importantly, in the most recent decade (2010s), the occurrence of WL, HT, and WL-HT simultaneously reached their historical high levels, which implies great risks of waterlogging and high temperatures for cotton in Hubei in recent periods. Significant mutations of WL, HT, and WL-HT over years were detected, among which most were positive, indicating significant enhancement of these disasters. Similar with the HT, the WL-HT was concentrated at the budding stage and the flowering and boll-filling stage. During the flowering and boll-filling stage, the WL-HT occurred most frequently and had the highest conversion rates of WL-HT; in particular, the conversion rates in the Enshi in south western Hubei, the Xiangyang in north western Hubei, and the Zhongxiang in south central Hubei were even greater than 30% (i.e., more than 30% WL have converted to WL-HT). From the aspect of spatial distribution, high-risk regions of different kinds of events differed obviously; however, the Huanggang in north eastern Hubei was both the high-risk regions of WL and WL-HT, thus being identified as a severely disaster-affected district. In comparison, some regions were with low WL but had great risk of WL-HT, including the Xiangyang, Zhongxiang and Jingzhou; the disastrous situation in these regions are prone to be underestimated in field drainage if only WL is considered. 【Conclusion】Cotton plants in Hubei province have been confronted with high risks of waterlogging events followed by high temperatures in the recent decade. Special attentions should be paid to timely drainage in cotton fields under high temperatures at the flowering and boll-filling stage, especially for the high-risk regions in south central Hubei, north western Hubei, and north eastern Hubei. |
| Key words: cotton; field drainage; rainstorms; waterlogging stress; heat stress |
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