We conducted ecosystem carbon and water vapour exchange studies in an old-growth Pinus ponderosaforest in the Pacific North-west region of the United States. The canopy is heterogeneous, with tall multiaged trees and an open, clumped canopy with low leaf area. Carbon assimilation can occur throughout relatively mild winters, …
Journal: Global Change Biology, Volume 6 (6): 613-630 (2000), ISBN . DOI: 10.1046/j.1365-2486.2000.00339.x Sites: US-Me5
Journal: Tree Physiology, Volume 20 (11): 745-753 (2000), ISBN . DOI: 10.1093/treephys/20.11.745 Sites: US-GLE
Fluxes of CO2, water vapor, and sensible heat were measured by the eddy covariance method above a young ponderosa pine plantation in the Sierra Nevada Mountains (CA) over two growing seasons (1 June–10 September 1997 and 1 May–30 October 1998). The Mediterranean-type climate of California is characterized by a protracted …
Journal: Agricultural And Forest Meteorology, Volume 101 (2-3): 113-129 (2000), ISBN . DOI: 10.1016/s0168-1923(99)00168-9 Sites: US-Blo
Acetone was one of the most abundant volatile organic compounds (VOCs) observed in the Sierra Nevada Mountains (California, USA). Mixing ratios were measured hourly above a ponderosa pine plantation using an automated in situ dual-channel GC-FID system throughout July 1997, …
Journal: Atmospheric Environment, Volume 34 (29-30): 4997-5006 (2000), ISBN . DOI: 10.1016/s1352-2310(00)00321-6 Sites: US-Blo
Ponderosa pine is one of the most sensitive species to ozone and a dominant species in the Sierra Nevada Mountains. To assess the factors controlling ozone deposition to the forest and to study the forest …
Journal: Journal Of Geophysical Research: Atmospheres, Volume 105 (D17): 22123-22136 (2000), ISBN . DOI: 10.1029/2000jd900168 Sites: US-Blo
Information on mass and energy exchange at the soil surface under vegetation is a critical component of micrometeorological, climate, biogeochemical and hydrological models. Under sparse boreal and western conifer forests as much as 50% of incident solar energy reaches the soil surface. How this energy is partitioned into …
Journal: Agricultural And Forest Meteorology, Volume 102 (2-3): 187-206 (2000), ISBN . DOI: 10.1016/s0168-1923(00)00098-8 Sites: CA-Ojp, US-Me4
A spectrum of models that estimate assimilation rate A from intercellular carbon dioxide concentration (Ci) and measured stomatal conductance to CO2 (gc) were investigated using leaf-level gas exchange measurements. The gas exchange measurements were performed in a uniform loblolly …
Journal: Plant, Cell And Environment, Volume 23 (12): 1313-1328 (2000), ISBN . DOI: 10.1046/j.1365-3040.2000.00641.x Sites: US-Dk3
Using a helicopter-mounted portable spectroradiometer and continuous eddy covariance data we were able to evaluate the photochemical reflectance index (PRI) as an indicator of canopy photosynthetic light-use efficiency (LUE) in four boreal forest species during the Boreal …
Journal: Agricultural And Forest Meteorology, Volume 101 (2-3): 131-142 (2000), ISBN . DOI: 10.1016/s0168-1923(99)00167-7 Sites: CA-Man, CA-Oas, CA-Obs, CA-Ojp
Journal: Arctic, Antarctic, And Alpine Research, Volume 32 (4): 368-374 (2000), ISBN . DOI: 10.2307/1552384 Sites: US-Ha2
Independent measurements of the major energy balance flux components are not often consistent with the principle of conservation of energy. This is referred to as a lack of closure of the surface energy balance. Most results in the literature have shown the sum of sensible …
Journal: Agricultural And Forest Meteorology, Volume 103 (3): 279-300 (2000), ISBN . DOI: 10.1016/s0168-1923(00)00123-4 Sites: US-LWW