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cycling along the western Sierra gradient Anne Kelly SSCZO annual meeting August 21, 2012

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Page 1: Carbon and water cycling along the western Sierra gradient Anne Kelly SSCZO annual meeting August 21, 2012

Carbon and water cycling along the western Sierra gradient

Anne KellySSCZO annual meeting

August 21, 2012

Page 2: Carbon and water cycling along the western Sierra gradient Anne Kelly SSCZO 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.

Page 3: Carbon and water cycling along the western Sierra gradient Anne Kelly SSCZO annual meeting August 21, 2012

P301 – not limited by cold or drought

temp

PAR

VPD

soil VWC

GEE (tC/ha)

NEE

ET (mm)

tree biomass

Page 4: Carbon and water cycling along the western Sierra gradient Anne Kelly SSCZO annual meeting August 21, 2012

Seasonality of water and carbon exchange

Page 5: Carbon and water cycling along the western Sierra gradient Anne Kelly SSCZO annual meeting August 21, 2012

Elevation patterns

Page 6: Carbon and water cycling along the western Sierra gradient Anne Kelly SSCZO annual meeting August 21, 2012

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)?


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