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Impact of Vegetation Redistribution on Montane Runoff and Evapotranspiration Dynamics

This study explores how upslope vegetation redistribution affects montane runoff and increases evapotranspiration (ET). By analyzing interannual relationships between snowpack and peak NDVI, it demonstrates that heavier snowpack correlates with higher NDVI values, especially in forested areas below 2500 m elevation, which are primarily water-limited. The findings have significant implications for understanding hydrological patterns, biogeochemical cycles, and ecosystem responses to climate change. The research emphasizes the importance of spatial patterns in soil depth and their influence on ecological dynamics.

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Impact of Vegetation Redistribution on Montane Runoff and Evapotranspiration Dynamics

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  1. Vulnerability of montane runoff to increased Evapotranspiration with upslope vegetation redistribution Target Journal: PNAS

  2. Vulnerability of montane runoff to increased Evapotranspiration with upslope vegetation redistribution Target Journal: PNAS

  3. Vulnerability of montane runoff to increased Evapotranspiration with upslope vegetation redistribution Target Journal: PNAS

  4. Trujillo, Molotch et al • Analyze interannual relationships between snowpack and peak NDVI • Snowpack from pillows • NDVI from GIMMS (AVHRR)

  5. Trujillo, Molotch et al • NDVI correlated w/ ET, GPP, LAI, foliage production • Heavier snowpack -> higher NDVI • Effect of snowpack on NDVI strongest (both r2 and slope) below 2000-2500 m • Forest below 2000-2500 m strongly water limited; high forest is cold limited

  6. Focus on “deep soil column” • Spatial patterns • Mechanism that control development and function • Implications for ecology, biogeochemistry and hydrology • What are spatial (elevation, local topography) patterns of “deep soil”? • How quickly can it form (weathering, fracture, etc)? • How do fast biogeophysics work (root depth, water movement)? • How does it control production, vegetation, biogeochemistry? • How does it control hydrology? • How will it control/limit/modify effects of climate change on montane hydrology, biogeochem/ecology? • Makes use of most people’s expertise • Important and poorly understood. Builds on round 1 – shows we’re learning . “Made great progress and will now focus on the next key unknown” • Clearly fits CZO scope/vision • Good experimental design essential

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