Western-Mediterranean Pinus pinaster tree ring widths and indices for the period 1950-2014

Aim: We investigate the effects of the environmental and geographical processes driving growth resilienceand recovery in response to drought inMediterraneanPinus pinasterforests. We explicitly consider how intra-specific variability modulates growth resilience to drought. Location: western Mediterranean basin Methods: We analyzed tree rings froma large network of 48 forests (836 trees) encompassing wide ecological and climatic gradients and including six provenances. To characterize the major constraints of P. pinaster growth under extremely dry conditions, we simulated growth responses to temperature and soil moisture using a process-based growth model coupled with the quantification of climate-growth relationships.Then, we related growth-resilience indices to provenance and site variables considering different drought events. Results: P. pinaster displayed strong variation in growth resilience across its distributional range, but common patterns were found within each provenance. Post-drought resilience increased with elevation and drier conditions but decreased with spring precipitation. Trees from dry sites were less resistant to drought but recovered faster than trees from wet sites. Main conclusions: Resilience strategies differed among tree provenances: wet forests showed higher growth resistance to drought, while dry forests presentedfaster growthrecovery, suggesting different impacts of climate warming on forest productivity.We detected geographicallystructured resilience patterns corresponding to different provenances,confirming high intra-specific variability in response to drought. This information should be included in species distribution models to simulate forest responses toclimate warming and forecasted aridification.研究目的：本研究旨在解析驱动地中海滨海松（Pinus pinaster）林在干旱胁迫下生长恢复力与灾后恢复过程的环境及地理调控机制，并明确种内变异对其干旱响应下生长恢复力的调控作用。 研究区域：地中海西部盆地 研究方法：本研究对覆盖广阔生态与气候梯度、包含6个种源的48个林分（共836株林木）的大型树木年轮网络数据进行分析。为明确极端干旱情境下滨海松生长的核心限制因子，本研究采用基于过程的生长模型（process-based growth model）结合气候-生长关系量化分析，模拟林木生长对温度与土壤湿度的响应模式；随后，针对不同干旱事件，将生长恢复力指数与种源及立地变量进行关联分析。 研究结果：滨海松在其分布区内的生长恢复力存在显著空间异质性，但各树种源内部呈现出一致的变化规律。干旱后恢复力随海拔升高与生境干旱化程度加剧而提升，却随春季降水量增加而降低。源自干旱立地的林木对干旱的抗性较弱，但其灾后恢复速度较湿润立地林木更快。 主要结论：不同种源的林木其恢复策略存在显著分化：湿润生境林分对干旱的生长抗性更高，而干旱生境林分则展现出更快的生长恢复速度，这表明气候变暖对森林生产力的影响存在种源特异性。本研究检测到与不同种源对应的地理分异型恢复力模式，证实了滨海松在干旱响应中存在高度的种内变异。上述研究结论应纳入物种分布模型（species distribution models），以模拟森林对气候变暖与预期干旱化的响应并开展相关预测。