云南松更新过程中“只见幼苗不见幼树”现象较为常见，而幼苗的死亡主要由光照和水分限制引起。国际上碳饥饿致死假说目前缺少足够的数据验证，干旱胁迫过程中非结构性碳（NSC）含量变化尚无一致结论，而且对碳饥饿过程中碳平衡机制认识不足，限制了我们对滇中地区未来极端干旱气候下云南松更新幼苗成活机制的认识。本研究通过设计持续干旱试验研究干旱过程中NSC在器官间含量以及分配动态变化；设计干旱-复水，完全遮阴-照光试验，来研究碳限制以及碳限制解除过程中NSC含量变化及恢复机制，并进一步分析碳饥饿致死时的NSC阈值；设计光强转换控制苗木NSC含量之后进行持续干旱试验，研究储存碳与抗旱性能之间的关系；设计完全遮阴过程中持续干旱试验，研究干旱过程中储存碳的利用机制。研究结果可进一步丰富碳饥饿理论研究，加深云南松抗旱机制认识，为云南松更新管理、林分结构调控等提供理论依据。

In the process of Pinus yunnanensis regeneration process, it is common to see seedlings but not saplings, and the death of seedlings is mainly caused by light and water restrictions. At present, the current international hypothesis of lethal carbon starvation still lacks sufficient data evidence, and there is no consensus on the changes of non-structural carbon (NSC) content during drought stress, more over, not aware of carbon balance mechanism during carbon starvation, which limits our understanding of survival mechanism of Pinus yunnanensis regeneration seedlings in the future extreme drought climate in central Yunnan. In this study, we designed a continuous drought experiment to study the dynamic changes of NSC content and distribution among organs during drought. A drought-rehydration and complete shading-illumination experiment was designed to study the change and recovery mechanism of NSC content during the process of carbon limitation and carbon limitation relief, and further analyzed the NSC threshold of lethal carbon starvation. Using light intensity conversion to control NSC content of seedlings and then Continuous drought stress was conducted, to study the relationship between carbon storage and drought resistance. Continuous drought during complete shading were designed to study the utilization mechanism of carbon storage during drought. The results can further enrich the theoretical study of carbon starvation, enhance the understanding of drought resistance mechanism of Pinus yunnanensis, and provide theoretical basis for regeneration management and stand structure adjustment of Pinus yunnanensis.