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BOREAS TE-09 IN SITU DIURNAL GAS EXCHANGE OF NSA BOREAL FOREST STANDS
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Summary:

The gas exchange data of the Boreal Ecosystem-Atmosphere Study (BOREAS) Northern Study Area (NSA) were collected to characterize diurnal gas exchange and water potential of two canopy levels of five boreal canopy cover types: young and old jack pine (Pinus banksiana Lamb.), old aspen (Populus tremuloides Michx.), and lowland and upland black spruce (Picea mariana (Mill) B.S.P.). These data were collected between 27-May-1994 and 17-Sep-1994. The purpose of this study was threefold: 1) to provide in situ gas exchange data that will be used to validate models of photosynthetic responses to light, temperature, and carbon dioxide (CO2); 2) to compare the photosynthetic responses of different tree crown levels (upper and lower), and 3) to characterize the diurnal water potential curves for these sites to get an indication of the extent to which soil moisture supply to leaves might be limiting photosynthesis.

A guide document which includes more information about this data set can be found at http://daac.ornl.gov/boreas/TE/te09gxda/comp/TE09_Gas_Exchange.txt .

ORNL DAAC maintains information on the entire BOREAS Project.

Data Citation

Cite this data set as follows:

Margolis, H., M. Coyea, and Q. Dang. 1998. BOREAS TE-09 In Situ Diurnal Gas Exchange of NSA Boreal Forest Stands. Data set. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge National Laboratory, Oak Ridge, Tennessee, U.S.A. doi:10.3334/ORNLDAAC/337.

References:

Coyea, M.R., Q-L. Dang, H. Margolis, M. Sy, and G. J. Collatz. 1996. Canopy profiles of PAR, nitrogen, and photosynthetic capacity:implications for scaling from leaf to canopy. North American Forest Biology Workshop. June 16-20 1996. Poster presented.

Dang, Q-L., H. Margolis, M.R. Coyea, M. Sy, G.J. Collatz and De Yue. 1995. Environmental controls on photosynthesis and stomatal conductance of boreal forest tree species. Ecological Society of America. July 31- August 4, 1995. Snowbird, UT.

Dang, Q-L., H. Margolis, M. Sy, M.R. Coyea, and G. J. Collatz. 1996. Profiles of photosynthetically active radiation, nitrogen, and photosynthetic capacity in the boreal forest: implications for scaling from leaf to canopy. Ecological Society of America. August 10-14, 1996. Providence RI.

Dang, Q-L., H. Margolis, M. Sy, M.R. Coyea, and G.J. Collatz. 1996. Water potential and vapor pressure difference as environmental controls on branch-level gas exchange of boreal tree species in northern Manitoba. North American Forest Biology Workshop. June 16-20, 1996.

Dang, Q.L., H. Margolis, M.R. Coyea, M. Sy, and G. J. Collatz,. 1996. Regulation of branch-level gas exchange of boreal trees: role of shoot water potential and vapor pressure difference. Tree Phys. In press.

Dang, Q.L., H. Margolis, M. Sy, M.R. Coyea, G.J. Collatz, and C. L. Walthall. 1996. Profiles of PAR, nitrogen, and photosynthetic capacity in the boreal forest: Implications for scaling from leaf to canopy. J. of Geophys. Res. In press.

Sellers, P., and F. Hall. 1994. Boreal Ecosystem-Atmosphere Study: Experiment Plan. Version 1994-3.0, NASA BOREAS Report (EXPLAN 94).

Sellers, P., and F. Hall. 1996. Boreal Ecosystem-Atmosphere Study: Experiment Plan. Version 1996-2.0, NASA BOREAS Report (EXPLAN 96).

Sellers, P., and F. Hall. 1997. BOREAS Overview Paper. JGR Special Issue (in press).

Sellers, P., F. Hall, and K.F. Huemmrich. 1996. Boreal Ecosystem- Atmosphere Study: 1994 Operations. NASA BOREAS Report (OPS DOC 94).

Sellers, P., F. Hall, and K.F. Huemmrich. 1997. Boreal Ecosystem- Atmosphere Study: 1996 Operations. NASA BOREAS Report (OPS DOC 96).

Sellers, P., F. Hall, H. Margolis, B. Kelly, D. Baldocchi, G. den Hartog, J. Cihlar, M.G. Ryan, B. Goodison, P. Crill, K.J. Ranson, D. Lettenmaier, and D.E. Wickland. 1995. The boreal ecosystem-atmosphere study (BOREAS): an overview and early results from the 1994 field year. Bulletin of the American Meteorological Society. 76(9):1549-1577.

Data Format:

For information on Parameter/Variable Names, Variable Description/Definition, Units of Measurement, and Data File Format see the companion file http://www.daac.ornl.gov/boreas/TE/te09gxda/comp/te09gxda.def.

Document Information:

31-July-1998 (data citation revised on 25-Sep-2002)

Document Review Date:

31-July-1998

Document Curator:

webmaster@www.daac.ornl.gov

Document URL:

http://daac.ornl.gov