Presenter
Dr. Wuxia Bi, China Institute of Water Resources and Hydropower Research
Co-author(s)
Prof. Cheng Zhang, Prof. Dawei Zhang, Dr. Xiaoming Jiang, Prof. Baisha Weng, Dr. Wenqing Lin, Dr. Fan Wang, Dr. Weiqi Wang
China Institute of Water Resources and Hydropower Research
Sub-theme
3. Building Resilience for Disaster Prevention and Mitigation
Topic
3-1. Prevention and mitigation of extreme weather induced water-related disasters
Body
Previous studies reported that drought-flood abrupt alternation events (DFAA) have been increasing in recent years, which brings significant stress (mainly adverse impacts) to agricultural production, water quality, and other socio-economic aspects. Abundant researchers have focused on the characteristics, mechanisms, and effects of DFAA events. However, sparse studies have concerned on the mitigation measures on DFAA events. Under these circumstances, this study aims to quantitatively evaluate the reduction of adverse impacts of DFAA events on summer maize farmland systems in the Huaibei Plain based on mitigation measures. On the basis of the critical thresholds obtained by field experiments, combined with the numerical simulation, we explored the mitigation effects on summer maize yield and water quality (soil phosphorus loss) under different scenarios in the history and future. The time period for the history and future scenarios in this study were from 1964 to 2017, and from 2020 to 2050, respectively. The results revealed that the mitigation measures on drought level degradation could decrease the yield reduction of summer maize by 9% under DFAA in the history scenario, while there was no significant reduction on soil phosphorus loss. The mitigation measures on drought level degradation could decrease the yield reduction of summer maize and soil phosphorus loss by 8.4% and -0.5% under DFAA in the future scenario. For the mitigation measures on flood level degradation, it could decrease the yield reduction of summer maize and the soil phosphorus loss by 32% and 41% under DFAA in the history scenario. The mitigation measures on flood level degradation could decrease the yield reduction of summer maize and soil phosphorus loss by 31% and 56% under DFAA in the future scenario. This study can provide references and guidance for estimating the impacts of mitigation measures on yield and water quality in farmland systems under DFAA, and further provide targeted regulation measures for water-related disasters.