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- W4366606098 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Extreme droughts are a major determinant of ecosystem disturbance, which impact plant communities and feed back to climate change through changes in plant functioning. However, the complex relationships between above- and belowground plant hydraulic traits, and their role in governing plant responses to drought, are not fully understood. In this study, we use a plant hydraulics model, FATES-Hydro, to investigate ecosystem responses to the 2012–2015 California drought, in comparison with observations, for a site in the southern Sierra Nevada that experienced widespread tree mortality during this drought. We conduct a sensitivity analysis to explore how different plant water sourcing and hydraulic strategies lead to differential responses during normal and drought conditions. The analysis shows that: 1) deep roots that sustain productivity through the dry season are needed for the model to capture observed seasonal cycles of ET and GPP in normal years, and that deep-rooted strategies are nonetheless subject to large reductions in ET and GPP when the deep soil reservoir is depleted during extreme droughts, in agreement with observations. 2) risky stomatal strategies lead to greater productivity during normal years as compared to safer stomatal control, but lead to high risk of xylem embolism during the 2012–2015 drought. 3) for a given stand density, the stomatal and xylem traits have a stronger impact on plant water status than on ecosystem level fluxes. Our study reveals the importance of resolving plant water sourcing strategies in order to represent drought impacts on plants, and consequent feedbacks, in models." @default.
- W4366606098 created "2023-04-23" @default.
- W4366606098 creator A5060740046 @default.
- W4366606098 date "2023-04-21" @default.
- W4366606098 modified "2023-09-30" @default.
- W4366606098 title "Reply on RC1" @default.
- W4366606098 doi "https://doi.org/10.5194/bg-2023-16-ac1" @default.
- W4366606098 hasPublicationYear "2023" @default.
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