AmeriFlux Publications from the Community

Site-Level Evaluation Of Satellite-Based Global Terrestrial Gross Primary Production And Net Primary Production Monitoring
Turner, D. P., Ritts, W. D., Cohen, W. B., Maeirsperger, T. K., Gower, S. T., Kirschbaum, A. A., Running, S. W., Zhao, M., Wofsy, S. C., Dunn, A. L., Law, B. E., Campbell, J. L., Oechel, W. C., Kwon, H. J., Meyers, T. P., Small, E. E., Kurc, S. A., Gamon, J. A.

Operational monitoring of global terrestrial gross primary production (GPP) and net primary production (NPP) is now underway using imagery from the satellite-borne Moderate Resolution Imaging Spectroradiometer (MODIS) sensor. Evaluation of MODIS GPP and NPP products will require site-level studies across a range of biomes, with close …

Journal: Global Change Biology, Volume 11 (4): 666-684 (2005), ISBN . DOI: 10.1111/j.1365-2486.2005.00936.x Sites: US-Me4, US-Me5

Coupling Of Canopy Gas Exchange With Root And Rhizosphere Respiration In A Semi-Arid Forest
Irvine, J., Law, B. E., Kurpius, M. R.

The strength of coupling between canopy gas exchange and root respiration was examined in ~15-yr-old ponderosa pine (Pinus ponderosa Doug. Ex Laws.) growing under seasonally drought stressed conditions. By regularly watering …

Journal: Biogeochemistry, Volume 73 (1): 271-282 (2005), ISBN . DOI: 10.1007/s10533-004-2564-x Sites: US-Me2, US-Me5

Disturbance And Climate Effects On Carbon Stocks And Fluxes Across Western Oregon USA
Law, B. E., Turner, D., Campbell, J., Sun, O. J., Van Tuyl, S., Ritts, W. D., Cohen, W. B.

We used a spatially nested hierarchy of field and remote-sensing observations and a process model, Biome-BGC, to produce a carbon budget for the forested region of Oregon, and to determine the relative influence of differences in climate and disturbance among the ecoregions on carbon stocks and fluxes. The simulations suggest that …

Journal: Global Change Biology, Volume 10 (9): 1429-1444 (2004), ISBN . DOI: 10.1111/j.1365-2486.2004.00822.x Sites: US-Me2, US-Me4, US-Me5

Limitations To Carbon Mineralization In Litter And Mineral Soil Of Young And Old Ponderosa Pine Forests
Kelliher, F., Ross, D., Law, B., Baldocchi, D., Rodda, N.

Summer drought is a feature of the semi-arid region of central Oregon, USA, where vegetation naturally develops into ponderosa pine (Pinus ponderosa var. Laws) forest. Forest management consists of clearcut harvest and natural regeneration. Soil microbial activity is interconnected with forest processes because substrate …

Journal: Forest Ecology And Management, Volume 191 (1-3): 201-213 (2004), ISBN . DOI: 10.1016/j.foreco.2003.12.005 Sites: US-Me4, US-Me5

A Global Relationship Between The Heterotrophic And Autotrophic Components Of Soil Respiration?
Bond-Lamberty, B., Wang, C., Gower, S. T.

Soil surface CO₂ flux (R_S) is overwhelmingly the product of respiration by roots (autotrophic respiration, R_A) and soil organisms (heterotrophic respiration, R_H). Many studies have attempted to partition R_S into these two components, with highly …

Journal: Global Change Biology, Volume 10 (10): 1756-1766 (2004), ISBN . DOI: 10.1111/j.1365-2486.2004.00816.x Sites: BR-Ma2, CA-Man, CA-Oas, CA-Obs, US-Dk1, US-Dk2, US-Dk3, US-Ha2, US-Me1, US-Me3, US-Me4, US-Me5, US-WBW

Forest Attributes From Radar Interferometric Structure And Its Fusion With Optical Remote Sensing
Treuhaft, R. N., Law, B. E., Asner, G. P.

The possibility of global, three-dimensional remote sensing of forest structure with interferometric synthetic aperture radar (InSAR) bears on important forest ecological processes, particularly the carbon cycle. InSAR supplements two-dimensional remote sensing with information in the vertical dimension. Its strengths in potential …

Journal: Bioscience, Volume 54 (6): 561-571 (2004), ISBN . DOI: 10.1641/0006-3568(2004)054[0561:fafris]2.0.co;2 Sites: US-Me2, US-Me4, US-Me5

Supply-Side Controls On Soil Respiration Among Oregon Forests
Campbell, J. L., Sun, O. J., Law, B. E.

To test the hypothesis that variation in soil respiration is related to plant production across a diverse forested landscape, we compared annual soil respiration rates with net primary production and the subsequent allocation of carbon to various ecosystem pools, including leaves, fine roots, forests floor, and mineral soil for 36 …

Journal: Global Change Biology, Volume 10 (11): 1857-1869 (2004), ISBN . DOI: 10.1111/j.1365-2486.2004.00850.x Sites: US-Me2, US-Me4, US-Me5

Monitoring Forest Carbon Sequestration With Remote Sensing And Carbon Cycle Modeling
Turner, D. P., Guzy, M., Lefsky, M. A., Ritts, W. D., Van Tuyl, S., Law, B. E.

Sources and sinks of carbon associated with forests depend strongly on the management regime and spatial patterns in potential productivity. Satellite remote sensing can provide spatially explicit information on land cover, stand-age class, and harvesting. …

Journal: Environmental Management, Volume 33 (4): 457-466 (2004), ISBN . DOI: 10.1007/s00267-003-9103-8 Sites: US-Me4, US-Me5

Climatic Versus Biotic Constraints On Carbon And Water Fluxes In Seasonally Drought-Affected Ponderosa Pine Ecosystems
Schwarz, P. A., Law, B. E., Williams, M., Irvine, J., Kurpius, M., Moore, D.

We investigated the relative importance of climatic versus biotic controls on gross primary production (GPP) and water vapor fluxes in seasonally drought-affected ponderosa pine forests. The study was conducted in young (YS), mature (MS), and old stands (OS) over 4 years at the AmeriFlux Metolius sites. Model simulations showed that …

Journal: Global Biogeochemical Cycles, Volume 18 (GB4007): n/a-n/a (2004), ISBN . DOI: 10.1029/2004GB002234 Sites: US-Me2, US-Me4, US-Me5

Dynamics Of Carbon Stocks In Soils And Detritus Across Chronosequences Of Different Forest Types In The Pacific Northwest, USA
Sun, O. J., Campbell, J., Law, B. E., Wolf, V.

We investigated variation in carbon stock in soils and detritus (forest floor and woody debris) in chronosequences that represent the range of forest types in the US Pacific Northwest. Stands range in age from <13 to >600 years. Soil carbon, to a depth of 100 cm, was highest in coastal Sitka spruce/western hemlock forests …

Journal: Global Change Biology, Volume 10 (9): 1470-1481 (2004), ISBN . DOI: 10.1111/j.1365-2486.2004.00829.x Sites: US-Me1, US-Me2, US-Me3, US-Me4, US-Me5

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