<b>Study on the suitable area of ratoon rice in China under climate change</b>

Ratoon rice is a special cultivation system developed based on the regenerative capacity of rice axillary buds. Its core mechanism lies in regulating the regeneration potential of stubble axillary buds through agronomic practices. After harvesting the main-season rice, dormant buds are induced to sprout and form secondary tillers, which eventually develop into effective panicles, thereby achieving “one planting with two harvests.” In this study, 167 occurrence records of ratoon rice, nine environmental variables, and three future climate scenarios proposed in CMIP6 (SSP1-2.6, SSP2-4.5, and SSP5-8.5) were used to predict the suitable cultivation area of ratoon rice in China using the MaxEnt model.再生稻（Ratoon rice）是依托水稻腋芽再生能力构建的特殊栽培体系，其核心机制为通过农艺措施调控稻茬腋芽的再生潜能。在头季稻收获后，可诱导休眠芽萌发并形成再生分蘖，最终发育为有效穗，从而实现‘一种两收’的种植模式。本研究收集167条再生稻发生记录、9项环境变量，结合第六次耦合模式比较计划（CMIP6）提出的3种未来气候情景（SSP1-2.6、SSP2-4.5及SSP5-8.5），借助最大熵模型（MaxEnt）预测了中国境内再生稻的适宜种植区域。