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Carbon and water cycling along the western Sierra gradient
Anne KellySSCZO annual meeting
August 21, 2012
Overview
• How does climate control carbon and water cycling?
• How do drought and cold limit growth and water use?
• Are there thresholds and resiliencies in ecosystem response along a gradient of drought and temperature?
• Four towers: 400, 1200, 2000, 2800 m– Weather, CO2 exchange, ET– Hourly to interannual – Severely drought limited to
severely cold limited with a happy zone in between
• Dendrometers, sap flux to for individual tree carbon and water cycling
• Litter collection, soil moisture, soil respiration, etc.
P301 – not limited by cold or drought
temp
PAR
VPD
soil VWC
GEE (tC/ha)
NEE
ET (mm)
tree biomass
Seasonality of water and carbon exchange
Elevation patterns
Future work
• How does cold and drought control ecosystem type, function, productivity, ET, and phenology along the gradient– Step changes/vulnerability– No changes/resilience
• How does species’ growth and water use vary along the gradient within species and among species?
• How do these forests compare to similar forests in Southern California (latitudinal gradient)?