Publications

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Publications Found: 37

Age-Related Changes In Ecosystem Structure And Function And Effects On Water And Carbon Exchange In Ponderosa Pine
Irvine, J., Law, B. E., Kurpius, M. R., Anthoni, P. M., Moore, D., Schwarz, P. A.

As forests age, their structure and productivity change, yet in some cases, annual rates of water loss remain unchanged. To identify mechanisms that might explain such observations, and to determine if widely different age classes of forests differ functionally, we examined young (Y, 25 years), mature (M, 90 years) …


Journal: Tree Physiology, Volume 24 (7): 753-763 (2004). DOI: 10.1093/treephys/24.7.753 Sites: US-Me2

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). 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). DOI: 10.1111/j.1365-2486.2004.00829.x Sites: US-Me1, US-Me2, US-Me3, US-Me4, US-Me5

Disturbance And Net Ecosystem Production Across Three Climatically Distinct Forest Landscapes
Campbell, J. L., Sun, O. J., Law, B. E.

Biometric techniques were used to measure net ecosystem production (NEP) across three climatically distinct forest chronosequences in Oregon. NEP was highly negative immediately following stand-replacing disturbance in all forests and recovered to positive values by 10, 20, and 30 years of age for the mild and mesic Coast Range, …


Journal: Global Biogeochemical Cycles, Volume 18 (4): n/a-n/a (2004). DOI: 10.1029/2004gb002236 Sites: US-Me2, US-Me4

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 …


Journal: Forest Ecology And Management, Volume 191 (1-3): 201-213 (2004). DOI: 10.1016/j.foreco.2003.12.005 Sites: US-Me2

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). DOI: 10.1111/j.1365-2486.2004.00822.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. Carbon-cycle process models coupled to regional climate databases can provide …


Journal: Environmental Management, Volume 33 (4): 457-466 (2004). DOI: 10.1007/s00267-003-9103-8 Sites: US-Me2