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| DOI：10.13522/j.cnki.ggps.2022072 |
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| Spatiotemporal Variation in Waterlogging and Thermal Stress to Cotton in Hubei Province |
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MENG Huayue, WU Yuxiao, QIAN Long, LUO Yunying, CHEN Cheng, XU Min, DENG Jingyao
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1. School of Water Resources and Hydropower Engineering, Wuhan University, Wuhan 430072, China;
2. School of Civil Engineering, Sun Yat-sen University, Guangzhou 510275, China;
3. Guangzhou Hydraulic Research Institute, Guangzhou 510220, China;
4. Shanghai Academy of Environmental Sciences, Shanghai 200233, China
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| Abstract: |
| 【Objective】Waterlogging and thermal stress are two abiotic stresses faced by cotton production in central China. This paper analyzed the spatiotemporal variation in waterlogging (WL), thermal stress (HT), and waterlogging followed by thermal stress (WL-HT) to cotton in Hubei province.【Method】Daily precipitation and air temperatures were collected from 26 meteorological stations across the province to calculate the occurrence of WL, HT, WL-HT, as well as the conversion from WL to WL-HT at the seedling, budding, flowering and boll-filling stage, and the boll opening stage. Spatiotemporal variations of these events were calculated using the linear temporal trend method, the moving t-test and the inverse distance interpolation. 【Result】The last six decades have seen a significant increase in WL (p<0.05) at the budding stage, and WL-ET at the flowering and boll-filling stage, as well as the whole growth season of the cotton. The conversion from WL to WL-HT also showed an increasing trend over the whole growth season. At decadal scale, the occurrence of HT and WL-HT trended similarly: both occurring less frequently in the 1980s and more frequently in the 2000s. Over the last decade in the 2010s, the occurrences of WL, HT, and WL-HT have reached their historical high. Abrupt changes in WL, HT and WL-HT were detected. We also found WL-HT occurred mainly at the budding, flowering and boll-filling stage. During the flowering and boll-filling stage, the WL-HT occurred most frequently. Spatially, the conversion from WL to WL-HL in Enshi, Xiangyang and Zhongxiang was >30%. Huanggang was prone to both WL and WL-HT. In contrast, Xiangyang, Zhongxiang and Jingzhou had a low WL but high WL-HT.【Conclusion】Cotton production in Hubei province has seen an increase in waterlogging followed by high temperatures over the recent decade. Timely drainage at the flowering and boll-filling stage when temperature is high in the south-central, northwestern and northeastern province is essential to safeguarding cotton production there. |
| Key words: cotton; field drainage; rainstorms; waterlogging stress; heat stress |
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