High-altitude regions serve as a vital climate repositories, freshwater resources and biodiversity hotspots. Tree-rings with precise dating control at annual level provide a valuable proxy for developing high-resolution paleoclimate records, and understanding vegetation changes under the backdrop of climate change, spanning over several centuries/millennia. The session welcomes interdisciplinary research that leverages tree rings to reconstruct past climate and ecological dynamics, such as treeline migration and soil vegetation interactions, responding to climatic and hydrological stress under warming scenario. The session aims to foster collaboration among palaeoclimatologists, hydrologists, and ecologists by showcasing work that integrates Dendroclimatic proxies and ecosystem monitoring. By synthesizing insights across disciplines, we seek thorough understanding of long-term climatic variability in fragile ecosystems and support informed strategies for managing habitat conservation and ecosystem resilience in a warming world.