Findings from a decade-plus study of comparative carbon, water and energy fluxes from an oak 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 Californiasavanna 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, Baldocchi@berkeley.edu

Below-ground Resources

References

Inter-annual Variability and Trends

Carbon Fluxes

LAI and Phenology

CANOAK-3D Modeling

Precipitation and EvapotranspirationGround 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 2009/10 2010/11 2011/12

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 2000. 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

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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 ImageCanopy 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 2001-2008. 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. 2012. Agricultural and Forest Meteorology 154–155:203-213.Ryu, Y., Baldocchi, D.D.,et al. 2011. Global Biogeochemical Cycles. 25 :GB4017Grant, R., Baldocchi, D.D. and Ma, S. 2011.  Agricultural and Forest Meteorology. 152:189-200Kobayashi, H., Baldocchi, D.D., et al. 2011.Agricultural and Forest Meteorology.152:83-100.Ma, S., Baldocchi, D.D., et al. 2011. Functional Ecology, 25: 258-270.Baldocchi, D.D ., Ma, S., et al. 2010.  Ecological Applications. 20: 1583-1597 Miller, G., Chen, X., Rubin, Y., Ma, S. and Baldocchi, D.D., 2010. Water Resources Research, 46: W10503Baldocchi, D.D . 2008.Australian Journal of Botany. 56, 1-26. Baldocchi D.D ., Liukang Xu. 2007. Advances in Water Research. 30, 2113-2122. Ma, S., Baldocchi, DD., Xu. L*, Hehn, T. 2007.Agricultural and Forest Meteorology. 147, 157-171.  Curiel-Yuste, J.., Baldocchi, DD., et al., 2007. Global Change Biology, 13: 1-18.Baldocchi, D.D ., Tang, J*. Xu, L. 2006.  Journal of Geophysical Research, Biogeosciences.111, G02008

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Coarse Root Densityderived from GPR calibratedby root excavation

Full rectangles – tree boleEmpty rectangles – excavated pits