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
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), ISBN . 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), ISBN . 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), ISBN . 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), ISBN . DOI: 10.1890/0012-9658(1999)080[0686:ecmoca]2.0.co;2 Sites: US-HVa
Canopy level flux measurements of 2-methyl-3-buten-2-ol (MBO) were made over a 7 year old ponderosa pine plantation in the Sierra Nevada range of California using the relaxed eddy accumulation method. Fluxes …
Journal: Journal Of Geophysical Research: Atmospheres, Volume 104 (D21): 26107-26114 (1999), ISBN . DOI: 10.1029/1999jd900749 Sites: US-Blo
Below-canopy eddy covariance measurements of CO2 flux (Fcb) and soil surface CO2flux measurements (Fs) were made seasonally in a ponderosa pine forest in central Oregon in 1996 and 1997. The forest ecosystem has …
Journal: Agricultural And Forest Meteorology, Volume 94 (3-4): 171-188 (1999), ISBN . DOI: 10.1016/s0168-1923(99)00019-2 Sites: US-Me4
A new approach is presented for deriving vegetation canopy structural characteristics from hyperspectral bidirectional reflectance distribution function (BRDF) data. The methodology is based on the relationship between spectral variability of BRDF effects and canopy geometry. …
Journal: Remote Sensing Of Environment, Volume 69 (3): 281-295 (1999), ISBN . DOI: 10.1016/s0034-4257(99)00032-2 Sites: CA-Obs, CA-Ojp
Journal: Tree Physiology, Volume 19 (11): 695-706 (1999), ISBN . DOI: 10.1093/treephys/19.11.695 Sites: CA-Man, CA-Obs, CA-Ojp
Interactions between elevated CO2 and N cycling were explored with a nutrient cycling model (NuCM, Johnson et al. 1993, 1995) for a Pinus taeda L. site at Duke University, North Carolina, and a mixed deciduous site at Walker Branch, Tennessee. The simulations tested whether N limitation would prevent growth increases …
Journal: Tree Physiology, Volume 19 (4-5): 321-327 (1999), ISBN . DOI: 10.1093/treephys/19.4-5.321 Sites: US-Dk3