Measuring the Effects of Disturbance & Climate on the CO2 & Energy Exchange of Ponderosa Pine Forests in the Pacific Northwest: Integration of Eddy Flux, Plant and Soil Measurements Page: 1 of 10
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Measuring the Effects of Disturbance & Climate on the CO2 & Energy Exchange of
Ponderosa Pine Forests in the Pacific Northwest: Integration of Eddy Flux, Plant
and Soil Measurements
Project ID: 0009555
Program Manager: Roger C. Dahlman, Phone: 301-903-4951, Division: SC-74
PI: Beverly E. Law
Award Register#: ER63653
Institution: Oregon State University
Institution URL: www.oregonstate.edu
Project URL: www.fsl.orst.edu/terra
KEYWORDS: carbon dioxide exchange, NEE, water vapor exchange, terrestrial carbon
processes, disturbance, climate, AmeriFlux
GOAL: Quantify and understand the influence of climate and disturbance on ecosystem
processes and thus net carbon uptake by forests.
OBJECTIVE: Combine tower and ground-based observations to quantify the effects of
disturbance on processes controlling carbon storage and CO2 and energy exchange in
varying climatic conditions. Specific objectives are:
1. Investigate the effects of logging and fire on carbon storage and carbon dioxide and
energy exchange in chronosequences of ponderosa pine, using consistent
2. Determine key environmental factors controlling carbon storage and carbon dioxide
and energy exchange in these forests through a combination of measurements and
3. Assess spatial variation of the concentrations and transport in complex terrain.
APPROACH: The eddy covariance method is used for measurements of C02, water
vapor, and energy exchanges in a chronosequence of ponderosa pine forests (burned in
2002 wildfire, 10 year-old stand, 90 year-old mature stand). The mature stand has been
an AmeriFlux site since 2000 (following previous flux sites in young and old stands
initiated in 1996). In addition to the eddy covariance measurements, a large suite of
biological processes and ecosystem properties are determined for the purpose of
developing independent forest carbon budgets and NEP estimates; these include
photosynthesis, stand respiration, soil CO2 fluxes, annual litterfall, foliar chemistry, and
bole increment, and soil organic matter among other parameters. The measurements are
being integrated and evaluated with two ecosystem models (BIOME-BGC and SPA).
Such analyses are needed to assess regional terrestrial ecosystem carbon budgets. The
results will contribute scientific understanding of carbon processes, and will provide
comprehensive data sets for forest managers and those preparing national carbon
inventories to use in assessments of carbon sequestration in relation to interannual
climate variation and disturbance. Frameworks and methodologies developed by the PI
will contribute to AmeriFlux Network facility functions for data acquisition, exchange
and modeling of results in a broad spectrum of carbon cycle research.
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Law, Beverly E. & Mahrt, Larry. Measuring the Effects of Disturbance & Climate on the CO2 & Energy Exchange of Ponderosa Pine Forests in the Pacific Northwest: Integration of Eddy Flux, Plant and Soil Measurements, report, January 5, 2007; United States. (digital.library.unt.edu/ark:/67531/metadc890287/m1/1/: accessed April 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.