Dennis Baldocchi, Jianwu Tang & Liukang Xu

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Presentation transcript:

Dennis Baldocchi, Jianwu Tang & Liukang Xu Separation of ‘Autotrophic’ and ‘Heterotrophic’ Respiration in an Oak-Grass Savanna and their Link with Canopy Photosynthesis Dennis Baldocchi, Jianwu Tang & Liukang Xu Biometeorology Lab Dept Environmental Science, Policy and Mgt University of California, Berkeley CarboEurope, Crete, 2006

Outline Introduction Methods Results and Discussion Quantifying Roles of Lags, Pulses and Switches Objectives Methods Site Description Continuous Soil CO2 Measurements Flux-gradient measurements Results and Discussion Responses to temperature, rain pulses and photosynthetic activity Test with Eddy Covariance

Partitioning Soil Respiration: Principles Kuyzakov 2006

Measure Soil Temperature at the location of the source

Girdling Experiment of Hogberg et al. 2000

Experimental Treatments Under a Tree: ~Ra+Rh Open Grassland: ~Rh (summer)

Tonzi Ranch/Oak Savanna

Vaisala GMT 220

Continuous Soil Respiration with soil CO2 Sensors [CO2] must be corrected for temperature

Theory/Equations Moldrup et al. 1999 Fcp: fraction silt and sand; b: constant; f:porosity; e: air-filled pore space

Validation with Chambers

Validation with EC Gophers, moved probe d129

Results and Discussion

CO2 in the Soil: Between and Under a Tree

What Happens After Rain? Microbial Stimulation It occurs for 4 days, until the soil dries Evacuation of Pores cannot be sustained for several days

Effects of temperature, soil moisture, rain and photosynthesis on CO2 Efflux

When Does Root Respiration Initiate?: Prior, Coincident or After the Start of Photosynthesis Canopy Ps starts ~d80 Rauto starts ~d100

Temperature: hysteresis and lags

Why?: Respiration Lags Photosynthesis, v1: Hourly Scale

Continuous Measurements Enable Use of Inverse Fourier Transforms to Quantify Lag Times

Respiration Lags Photosynthesis, v2: Daily Scale

Biometeorology Team Liukang Xu Jianwu Tang Ted Hehn Funding: US DOE/TCP; WESTGEC/NIGEC; Kearney Soil Science Found.,Ca Ag Expt Station, AmeriFlux