Findings from a decade-plus study of comparative carbon, water and energy fluxes from an oak savanna and an annual grassland in the Mediterranean climate.

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Presentation transcript:

Findings from a decade-plus study of comparative carbon, water and energy fluxes from an oak savanna and an annual grassland in the Mediterranean climate of California Acknowledgments Dennis D. Baldocchi, Siyan Ma, Joe Verfaillie, Naama Raz-Yaseef, Hideki Kobayashi, Youngryel Ryu, Laurie Koteen University of California, Berkeley, Berkeley, CA, Below-ground Resources References Inter-annual Variability and Trends Carbon Fluxes LAI and Phenology CANOAK-3D Modeling Precipitation and Evapotranspiration Ground Penetrating Radar (GPR) Coarse Root Survey Groundwater Depth from three wells EC ~ hydraulic conductivity analyzed from EMI data following a rain event Electromagnetic Induction (EMI) Survey of Soil Depth Carbon and Water Fluxes 2000/1 2001/2 2002/3 2003/4 2004/5 2005/6 2006/7 2007/8 2008/9 2009/ / /12 NEE (gC m -2 d -1 ) Tonzi grass-oak savanna Below canopy fluxes (grasses and soil) Canopy fluxes (trees) We have been collecting carbon and water fluxes of an oak savanna and annual grassland in the Mediterranean climate of California since This long, continuous and comparative data record gives us an unprecedented ability to understand and quantify the interannual variations in carbon, water and energy exchange of contrasting functional types and ecosystem processes and strategies in responses to the highly variable annual or seasonal precipitation inputs. Our scientific approach uses the eddy covariance to measure the net and gross fluxes of trace gases between ecosystems and the atmosphere. We augment these measurements with a variety of mechanistic studies that examine the physiological and biophysical control on these fluxes. Abstract BESS - Breathing Earth System Simulator hour hour hour These efforts involve laboratory and field measurements on the exchange of gases from the soil, leaves and plants, such as: ► understory eddy flux measurements ► pre-dawn water potential ► soil moisture ► leaf-level photosynthetic capacity ► soil respiration ► the water table ► excavation of roots To upscale our flux measurements we rely on an assortment of remote sensing measurements. These efforts include: ► measuring light transmission through vegetation ► monitoring hyperspectral reflectance of the vegetation ► time series of canopy photos to monitor phenology ► LIDAR surveys of vegetation structure. Spatial variations in light environments (12:00p.m., DOY 194, 2008) Forest Structure LIDAR Image Canopy Structure in 3D scheme Flowchart of 3D radiation and energy model Model comparison Direct Canopy Picture (DCP) This research has been supported by the Office of Science (BER), the U.S. Department of Energy (DE-FG02- 03ER63638), and the Western Regional Center of the National Institute for Global Environmental Change under Cooperative Agreement (DE-FC02- 03ER63613). We gratefully thank Mr. Ted Hehn for his technical support between We appreciate Mr. Russell Tonzi and Mr. Fran Vaira for allowing us to access their ranch for scientific research. Raz-Yaseef, N., Baldocchi, D.D., et al. in prep. Koteen, L., Baldocchi, D.D., et al. in prep. Ryu, Y., Baldocchi, D.D.,et al. in prep. Ma, S., Baldocchi, D. D. et al Agricultural and Forest Meteorology 154–155: Ryu, Y., Baldocchi, D.D.,et al Global Biogeochemical Cycles. 25 :GB4017 Grant, R., Baldocchi, D.D. and Ma, S Agricultural and Forest Meteorology. 152: Kobayashi, H., Baldocchi, D.D., et al Agricultural and Forest Meteorology.152: Ma, S., Baldocchi, D.D., et al Functional Ecology, 25: Baldocchi, D.D., Ma, S., et al Ecological Applications. 20: Miller, G., Chen, X., Rubin, Y., Ma, S. and Baldocchi, D.D., Water Resources Research, 46: W10503 Baldocchi, D.D Australian Journal of Botany. 56, Baldocchi D.D., Liukang Xu Advances in Water Research. 30, Ma, S., Baldocchi, DD., Xu. L*, Hehn, T Agricultural and Forest Meteorology. 147, Curiel-Yuste, J.., Baldocchi, DD., et al., Global Change Biology, 13: Baldocchi, D.D., Tang, J*. Xu, L Journal of Geophysical Research, Biogeosciences.111, G02008 … (for more, please visit Coarse Root Density derived from GPR calibrated by root excavation Full rectangles – tree bole Empty rectangles – excavated pits