全球变化知识资源中心

Global warming has increased the frequency of extreme weather, resulting in severe losses in crop production. Double rice (Oryza sativa L.) cropping system, a system where two seasonsof rice are grown per year, is thus facing challenges in maintaining its yield stability throughout Southern China. Therefore, the current study was focused on the multiple stresses induced by climate change, yield anomaly, and losses for the double rice were then examined across different growth stages. Results showed the increase in both high-temperature and water-related stresses during the past three decades, while the low temperature stress for the late rice was not severe. However, the middle and lower reaches of the Yangtze River (MLRYZ) were subject to less severe stresses compared with that of the South China (SC). Yield anomaly varied among subregions for both early rice and late rice. A case study in Hunan province showed that extreme stresses threatened the yield of double rice system, and vapor pressure deficits changed yield by -6.66% for the early rice and -1.82% for the late rice. Thus, climate-smart practices are needed for the double rice cropping system in Southern China to mitigate the effects of extreme weather and stabilize double rice yield.