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). 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). 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). 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). 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). 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). DOI: 10.1139/cjfr-29-8-1248 Sites: US-SP1, US-SP2, US-SP3, US-SP4
Monitoring of forest evolution and functioning with remote sensing depends on canopy BRF (bidirectional reflectance factor) sensitivity to biophysical parameters and to canopy PAR (photosynthetically active radiation) regime. Here, we study the canopy BRF of a tropical (Sumatra) …
Journal: Remote Sensing Of Environment, Volume 68 (3): 281-316 (1999). DOI: 10.1016/s0034-4257(98)00119-9 Sites: CA-Oas, CA-Obs, CA-Ojp
Mapping and monitoring of leaf area index (LAI) is important for spatially distributed modeling of vegetation productivity, evapotranspiration, and surface energy balance. Global LAI surfaces will be an early product of the MODIS Land Science Team, and the requirements for …
Journal: Remote Sensing Of Environment, Volume 70 (1): 52-68 (1999). DOI: 10.1016/s0034-4257(99)00057-7 Sites: US-KFB, US-Kon
In this paper, the one-dimensional, process-based soil CO2 model (PATCIS) described in Part 1 is parameterized and validated with field data collected in a mature slash pine plantation in Florida. The results of a model sensitivity analysis show that CO2 …
Journal: Agricultural And Forest Meteorology, Volume 95 (4): 237-256 (1999). DOI: 10.1016/s0168-1923(99)00035-0 Sites: US-SP1, US-SP2, US-SP3, US-SP4
Eddy covariance was used to measure the net CO2 exchange and energy balance of a moist-tussock tundra ecosystem at Happy Valley, Alaska (69°08.54′ N, 148°50.47′ W), during the 1994–1995 growing seasons (June–August). The system operated for 75–95% of the time, and energy balance closure was within 5%, indicating …
Journal: Ecology, Volume 80 (2): 686-701 (1999). DOI: 10.1890/0012-9658(1999)080[0686:ecmoca]2.0.co;2 Sites: US-HVa