Construction of yield loss indicators for cold vortex, light-temperature-water combined stress during the flowering period of rice in Northeast China.

• DOI: 10.13287/j.1001-9332.202403.035
• Publication Date: 2024-03-18
• Authors: Jia-Jia Lyu; Zheng Chu; Bai-Chao Li; Lijuan Gong; Bao-Cai Zhou; Dan Liu; Dongni Wang; Lixia Jiang
• Keywords: Water Stress; Cold stress

The construction of a yield loss evaluation index for the cold vortex type light-temperature-water composite adversity during rice flowering period in Northeast China is important elucidating impacts disasters on middle and high latitude areas. Moreover, it can provide meteorological support to ensure safe production high-quality japonica contribute regional disaster reduction efficiency improvement. By combining growth data, we delineated constructed stress occurrence at stage japonica. We analyzed relationship between factors causing structure, as well different structures by employing BP neural network method. further dissected processes involved causation combined disasters. Based K-means clustering method historical typical years, quantified critical thresholds grades, established an model assessing caused from light-temperature-water. Finally, examined spatial temporal variations low temperature, abundant rainfall, reduced sunlight three provinces China. Results showed that light, water mild, moderate, severe types were [0, 0.21), [0.21, 0.32), [0.32, 0.64], respectively. rates 0.03), [0.03, 0.08), [0.08, 0.096], verification results total 751 samples 11 random years 1961 2020, percentage stations which grade, calculated developed this study, aligning with actual grade was 63.7%, consistently exceeding 58.0% annually. proportion sites similarity or difference level 1 stood 88.3%, surpassing 85.0% each year. could effectively assess extent