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Effect of tree-to-shrub type conversion on streamflow in the southern Sierra Ryan Bart Sara Baguskas Nicole Molinari Max Moritz Naomi Tague.

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Presentation on theme: "Effect of tree-to-shrub type conversion on streamflow in the southern Sierra Ryan Bart Sara Baguskas Nicole Molinari Max Moritz Naomi Tague."— Presentation transcript:

1 Effect of tree-to-shrub type conversion on streamflow in the southern Sierra Ryan Bart Sara Baguskas Nicole Molinari Max Moritz Naomi Tague

2 Climate-induced stress on forests > temperatures > water stress > disease > fire

3 Research Objective How might type conversion from a conifer to shrub-dominated ecosystem impact watershed- scale ecohydrology in snow-rain transition zone of the southern Sierra? Climate-induced stress on forests > temperatures > water stress > disease > fire

4 Field Sites Site #2 Elev: 2020 m Site #1 Elev: 1940 m

5 Field Component Plant water status Predawn xylem pressure potential (prexpp) Leaf-level gas exchange rates Maximum light and optimal conditions Phenology Leaf samples for 13C and C&N Live fuel moisture Modeling Component Carbon and Nitrogen Processes Vertical Hydrologic Processes Horizontal Hydrologic Processes RHESSys

6 Conifers Abies concolor (White fir) Calocedrus decurrens (Incense cedar) Shrubs Arctostaphylos patula (Greenleaf manzanita) Ceanothus cordulatus (Mountain whitehorn)

7 Field Component Plant water status Predawn xylem pressure potential (prexpp) Leaf-level gas exchange rates Maximum light and optimal conditions Phenology Leaf samples for 13C and C&N Live fuel moisture Modeling Component Carbon and Nitrogen Processes Vertical Hydrologic Processes Horizontal Hydrologic Processes RHESSys

8 Plant water status Site #1

9 Effect of tree-to-shrub type conversion on streamflow in the southern Sierra?

10 Stay tuned!

11

12 Hypothetical relationship between seasonal plant water availability and plant water use Gas exchange rates Plant water status High water availability Low water availability April October Species A Species B

13 Key contacts Postdocs Sara Baguskas plant ecophysiologist (field research) baguskas@geog.ucsb.edu Max Moritz, mmoritz@berkeley.edu PIs Ryan Bart hydrologic modeler ryanrbart@berkeley.edu Naomi Tague, ctague@bren.ucsb.edu

14 Streamflow timing Streamflow amount Changes in rooting depth Change in phenology Change in energy balance Change in relation between transpiration and water availability Spatial pattern on landscape Temporal changes in rainfall conditions

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