Fire is the dominant stand-replacing agent in the Canadian boreal forest, but few quantitative measurements are available on the micrometeorological effects of fire. Airborne flux measurements during the BOREAS experiment were referenced to age of burn along a 500-km transect …
Journal: Agricultural And Forest Meteorology, Volume 96 (4): 199-208 (1999), ISBN . DOI: 10.1016/s0168-1923(99)00050-7 Sites: CA-Man
This paper shows the results of solar flux measurements routinely collected within boreal conifer forests during BOREAS 1994. Such vegetation have open canopies with a high level of clumping and covered by crowns which yields strong directional effects on the spectral hemispherical …
Journal: Agricultural And Forest Meteorology, Volume 93 (1): 1-6 (1999), ISBN . DOI: 10.1016/s0168-1923(98)00110-5 Sites: CA-Obs, CA-Ojp
Hourly data for concentrations and fluxes of CO2 at 30 m in Harvard Forest (Petersham, Massachusetts) are analyzed using linear modeling to obtain regionally representative CO2 concentrations …
Journal: Journal Of Geophysical Research: Atmospheres, Volume 104 (D8): 9561-9569 (1999), ISBN . DOI: 10.1029/1999jd900102 Sites: US-Ha1
A fully automated gas chromatograph-flame ionization detector system was designed and built to measure ambient concentrations of C2-C10 volatile organic compounds, including many oxygenated compounds, without using liquid cryogen. It was deployed at Blodgett Forest Research Station in Georgetown, California, …
Journal: Journal Of Geophysical Research: Atmospheres, Volume 104 (D17): 21247-21262 (1999), ISBN . DOI: 10.1029/1999jd900289 Sites: US-Blo
Substantial research seeks to improve estimates of ecosystem processes and fluxes at a range of scales, notably from the stand scale (<1 km2) using ecosystem physiology and eddy covariance techniques, to the landscape (∼102 km2) and …
Journal: Remote Sensing Of Environment, Volume 70 (1): 69-81 (1999), ISBN . DOI: 10.1016/s0034-4257(99)00058-9 Sites: CA-Man, US-KFB, US-Kon
To evaluate the carbon budget of a boreal deciduous forest, we measured CO2 fluxes using the eddy covariance technique above an old aspen (OA) forest in Prince Albert National Park, Saskatchewan, Canada, in 1994 and 1996 as part of the Boreal Ecosystem-Atmosphere Study (BOREAS). We found that the OA forest is a strong …
Journal: Global Change Biology, Volume 5 (1): 41-53 (1999), ISBN . DOI: 10.1046/j.1365-2486.1998.00201.x Sites: CA-Oas
In tallgrass prairie, plant species interactions regulated by their associated mycorrhizal fungi may be important forces that influence species coexistence and community structure; however, the mechanisms and magnitude of these interactions remain unknown. The objective of this study was to determine how interspecific competition, …
Journal: Oecologia, Volume 121 (4): 574-582 (1999), ISBN . DOI: 10.1007/s004420050964 Sites: US-KFB, US-Kon
Carbon dioxide, water vapour, and sensible heat fluxes were measured above and within a spruce dominated forest near the southern ecotone of the boreal forest in Maine, USA. Summer, mid-day carbon dioxide uptake was higher than at other boreal coniferous forests, averaging about – 13 μmol CO2 m–2 s–1. …
Journal: Global Change Biology, Volume 5 (8): 891-902 (1999), ISBN . DOI: 10.1046/j.1365-2486.1999.00281.x Sites: US-Ho1
To investigate whether sun and shade leaves respond differently to CO2 enrichment, we examined photosynthetic light response of sun and shade leaves in canopy sweetgum (Liquidambar styraciflua L.) trees growing at ambient and elevated (ambient + 200 μl l−1) atmospheric CO2 in the Brookhaven …
Journal: Tree Physiology, Volume 19 (12): 779-786 (1999), ISBN . DOI: 10.1093/treephys/19.12.779 Sites: US-Dk3
Phenological observations were used in conjunction with destructive sampling and measurements of plant cover to determine the aboveground seasonal dynamics, annual aboveground …
Journal: Canadian Journal Of Forest Research, Volume 29 (8): 1248-1253 (1999), ISBN . DOI: 10.1139/cjfr-29-8-1248 Sites: US-SP1, US-SP2, US-SP3, US-SP4