- Quantitative assessment of carbon (C) storage by forests requires an understanding of climatic controls over respiratory C loss. Ecosystem respiration can be estimated biometrically as the sum (RΣ) of soil (Rs), leaf (Rl) and wood (Rw) …
Journal: New Phytologist, Volume 167 (2): 437-456 (2005), ISBN . DOI: 10.1111/j.1469-8137.2005.01438.x Sites: US-UMB
Chamber measurements of total ecosystem respiration (TER) in a native Canadian grassland ecosystem were made during two study years with different precipitation. The growing season (April–September) precipitation during 2001 was less than one-half of the 30-year mean (1971–2000), while 2002 received almost double the normal growing …
Journal: Agricultural And Forest Meteorology, Volume 130 (3-4): 237-253 (2005), ISBN . DOI: 10.1016/j.agrformet.2005.04.002 Sites: CA-Let
To assess the relative influence of edaphoclimatic gradients and stand replacing disturbance on the soil respiration of Oregon forests, we measured annual soil respiration at 36 independent forest plots arranged as three replicates of four age classes in …
Journal: Biogeochemistry, Volume 73 (1): 109-125 (2005), ISBN . DOI: 10.1007/s10533-004-5165-9 Sites: US-Me2, US-Me3, US-Me4, US-Me5
Yield maps reflect systematic and random sources of yield variation as well as numerous errors caused by the harvest and mapping procedures used. A general framework for processing of multi-year yield map data was developed. Steps included (1) raw data screening, …
Journal: Precision Agriculture, Volume 6 (2): 193-212 (2005), ISBN . DOI: 10.1007/s11119-005-1035-2 Sites: US-Ne1, US-Ne2, US-Ne3
Soil temperature and moisture influence soil respiration at a range of temporal and spatial scales. Although soil temperature and moisture may be seasonally correlated, intra and inter-annual variations in soil moisture do occur. There are few direct observations …
Journal: Biogeochemistry, Volume 73 (1): 149-182 (2005), ISBN . DOI: 10.1007/s10533-004-5166-8 Sites: US-WCr
Forest canopies are composed of photosynthetically active vegetation (PAV, chloroplasts) and nonphotosynthetic vegetation (NPV, e.g., cell wall, vein, branch). The fraction of photosynthetically active radiation …
Journal: Ecological Applications, Volume 15 (3): 954-969 (2005), ISBN . DOI: 10.1890/04-0470 Sites: US-Ho1, US-Ho2, US-Ho3
Eddy covariance measurements of carbon dioxide (CO2) and water vapour fluxes were made from June 2002 to May 2003 over a 65-year-old temperate conifer plantation forest in southern Ontario, Canada. This site is part of a newly initiated long-term tower flux measurement …
Journal: Agricultural And Forest Meteorology, Volume 128 (3-4): 223-241 (2005), ISBN . DOI: 10.1016/j.agrformet.2004.10.003 Sites: CA-Ca1, CA-TP1, CA-TP2, CA-TP3, CA-TP4, US-Dk3, US-GLE, US-Ho1, US-Me4, US-Me5, US-NR1
Many monoterpenes have been identified in forest emissions using gas chromatography (GC). Until now, it has been impossible to determine whether all monoterpenes are appropriately measured using GC techniques. We used a proton transfer reaction mass spectrometer (PTR-MS) coupled with the eddy covariance (EC) technique to measure …
Journal: Atmospheric Chemistry And Physics, Volume 5 (2): 505-513 (2005), ISBN . DOI: 10.5194/acp-5-505-2005 Sites: US-Blo
Observed responses of upland-oak vegetation of the eastern deciduous hardwood forest to changing CO2, temperature, precipitation and tropospheric ozone (O3) were derived from field studies and interpreted with a stand-level model for an 11-year range of environmental variation upon which scenarios of future …
Journal: Global Change Biology, Volume 11 (9): 1402-1423 (2005), ISBN . DOI: 10.1111/j.1365-2486.2005.00991.x Sites: US-WBW
Understanding links between the disturbance regime and regional climate in boreal regions requires observations of the surface energy budget from ecosystems in various stages of secondary succession. While several studies have characterized fire-induced differences in surface energy fluxes from boreal ecosystems during summer months, …
Journal: Journal Of Geophysical Research, Volume 110 (D13): n/a-n/a (2005), ISBN . DOI: 10.1029/2004jd005158 Sites: US-Bn1, US-Bn2, US-Bn3