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Turnipseed, A. A., Anderson, D. E., Blanken, P. D., Baugh, W. M., Monson, R. K.
We have studied the effects of local topography and canopy structure on turbulent flux measurements at a site located in mountainous terrain within a subalpine, coniferous forest. Our primary aim was to determine whether the complex terrain of the site affects the accuracy of eddy flux measurements from a practical perspective. We …
Journal: Agricultural And Forest Meteorology, Volume 119 (1-2): 1-21 (2003), ISBN . DOI: 10.1016/s0168-1923(03)00136-9 Sites: US-NR1
Butnor, J. R., Johnsen, K. H., Oren, R., Katul, G. G.
Elevated atmospheric carbon dioxide (CO2e) increases soil respiration rates in forest, grassland, agricultural and wetland systems as a result of increased …
Journal: Global Change Biology, Volume 9 (6): 849-861 (2003), ISBN . DOI: 10.1046/j.1365-2486.2003.00630.x Sites: US-Dk3
Ping, J. L., Dobermann, A.
Annual yield maps are spatially fragmented because of random variation caused by crop management as well as measurement errors. Two approaches for creating maps of spatially contiguous yield classes were evaluated at two irrigated sites. In the first approach, prior-classification interpolation (PCI), grid size was increased from …
Journal: Agronomy Journal, Volume 95 (5): 1121-1131 (2003), ISBN . DOI: 10.2134/agronj2003.1121 Sites: US-Ne1, US-Ne2, US-Ne3
Schmid, H. P.
We report results from the first 3 years (1999–2001) of long-term measurements of net ecosystem exchange (NEE) at an AmeriFlux site over a mixed hardwood forest in northern lower Michigan. The primary measurement methodology uses eddy covariance systems with closed-path infrared gas analyzers at two heights (46 and 34 m) above …
Journal: Journal Of Geophysical Research, Volume 108 (D14): 4417-n/a (2003), ISBN . DOI: 10.1029/2002JD003011 Sites: US-UMB
Schafer, K. V., Oren, R., Ellsworth, D. S., Lai, C., Herrick, J. D., Finzi, A. C., Richter, D. D., Katul, G. G.
We linked a leaf-level CO2 assimilation model with a model that accounts for light attenuation in the canopy and measurements of sap-flux-based canopy conductance into a new canopy conductance-constrained carbon assimilation (4C-A) model. We estimated canopy CO2 uptake (AnC) at the Duke Forest …
Journal: Global Change Biology, Volume 9 (10): 1378-1400 (2003), ISBN . DOI: 10.1046/j.1365-2486.2003.00662.x Sites: US-Dk3
Matamala, R., Gonzalez-Meler, M. A., Jastrow, J. D., Norby, R. J., Schlesinger, W. H.
Estimates of forest net primary production (NPP) demand accurate estimates of root production and turnover. We assessed root turnover with the use of an isotope tracer in two forest free-air carbon dioxide enrichment experiments. Growth at elevated carbon dioxide did not accelerate root turnover in either the pine or the hardwood …
Journal: Science, Volume 302 (5649): 1385-1387 (2003), ISBN . DOI: 10.1126/science.1089543 Sites: US-Dk3, US-WBW
Werner, C., Davis, K., Bakwin, P., Yi, C., Hurst, D., Lock, L.
The biosphere–atmosphere exchange of methane (CH4) was estimated for a temperate/boreal lowland and wetland forest ecosystem in northern Wisconsin for 1997–1999 using the modified Bowen ratio (MBR) method. Gradients of CH4 and CO2 and CO2 flux were measured on the 447-m WLEF-TV tower …
Journal: Global Change Biology, Volume 9 (9): 1251-1261 (2003), ISBN . DOI: 10.1046/j.1365-2486.2003.00670.x Sites: US-Los, US-PFa, US-WCr
Gitelson, A. A., Verma, S. B, Rundquist, D. C., Keydan, G., Leavitt, B., Arkebauer, T. J., Burba, G. G., Suyker, A. E.
[1] There is considerable interest in assessing the magnitude of carbon sources and sinks for agricultural lands, grasslands, and forests. In this paper, we propose a novel …
Journal: Geophysical Research Letters, Volume 30 (9): 1486-n/a (2003), ISBN . DOI: 10.1029/2002GL016543 Sites: US-Ne1, US-Ne2
Chen, J. M., Ju, W., Cihlar, J., Price, D., Liu, J., Chen, W., Pan, J., Black, A., Barr, A.
Journal: Tellus Series B-Chemical and Physical Meteorology, Volume 55 (2): 622-641 (2003), ISBN . DOI: 10.1034/j.1600-0889.2003.00036.x Sites: CA-Ca1, CA-Oas, CA-Obs
Gray, D. W., Lerdau, M. T., Goldstein, A. H.
Volatile organic compounds emitted by plants have long been recognized as having important influences on tropospheric chemistry, most notably in contributing to the production of tropospheric ozone and aerosols. One such compound, methylbutenol (MBO), was recently identified as a major component of the volatiles emitted by ponderosa …
Journal: Ecology, Volume 84 (3): 765-776 (2003), ISBN . DOI: 10.1890/0012-9658(2003)084[0765:iothws]2.0.co;2 Sites: US-Blo