Warming-induced expansion in vegetation coverage and activity can accelerate the montane hydrological regimes. However, the climate impacts on ecohydrology of forested valleys of the Himalaya are uncertain. In this study, utilizing results of about three centuries of cellulose isotope chronologies (δ 13C and δ 18O) of dominant tree species, geo-chronological proxies, bio-geophysical dataset and simulations including satellite observations, we show an activation in the ecophysiological processes including evapotranspiration (ET) since the 1950s. Observation suggests rapid greening, while isotopic records indicate enhanced assimilation and transpiration in deciduous species vis-à-vis conifers post 1950s. Given strong vegetation-precipitation feedback and superimposed on the increasing trends of conducive atmospheric factors affecting valley-scale convective processes, intensification in forest ET is manifesting in a progressive enhancement in extreme rainfall events (EREs) since the last few decades. Results suggest that representation of ecophysiological processes and dynamics of seasonal moisture loading in observational and modelling framework is critical for understanding EREs under climate change.

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Sustainable food system ensures adequate and safe food supply in an eco-friendly manner. We assessed food sustainability perception and practices of local community through structured interviews in sub-alpine settlements of Uttarakhand Himalaya. Major perceived challenges towards food sustainability were identified using Rank-Based Quotient analysis. Association with various socio-demographic factors (e.g., age, gender, education, socio-economy, and socio-culture) was tested. An overall neutral perception (mean score 2.9) and moderately sustainable practices (mean score 3.1) were observed. Respondents with higher socio-cultural score showed more sustainable food sourcing practices and more positive social and economic sustainability perception, as well as higher participatory willingness. Female respondents were more dependent on sustainable food sources than the males. Education level influenced food quality choice. People identified higher food production cost as major economic constraint; while small landholdings and labor migration were main social challenges. Land and water management issues and climate uncertainty were the major environmental constraints. Socio-cultural exposure played significant role in ranking these sustainability constraints. We encourage direct involvement of socio-culturally active people and conducting extensive outreach programs for future sustainable local food system in vulnerable Himalayan valleys.

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