Carbon dioxide (CO2) exchange was measured above the forest floor of a temperate Douglas-fir (Pseudotsuga menziesii (Mirbel)
Franco) and Western Hemlock (Tsuga heterophylla (Raf.) Sarg.) old-growth forest in southern Washington State. Continuous flux
measurements were conducted from July 1998 to December 2003 using the eddy-covariance …
Journal: Agricultural and Forest Meteorology, Volume 135: 269-283 (2005), ISBN . DOI: Sites: US-Wrc
In this paper, we analyzed 3 years of carbon flux data from continuous eddy covariance measurements to investigate how soil moisture, rain pulses, and growth alter the response of ecosystem respiration to temperature. The data were acquired over an annual grassland and from the grass understory of an oak/grass savanna ecosystem in …
Journal: Global Biogeochemical Cycles, Volume 18 (GB4002): 0-0 (2004), ISBN . DOI: 10.1029/2004GB002281 Sites: US-Ton
A physiologically-driven spectral index using two ocean-color bands of MODIS satellite sensor showed great potential to track seasonally changing photosynthetic light use efficiency (LUE) and stress-induced reduction in net primary productivity (NPP) of terrestrial vegetation. Based on these findings, we developed a simple “continuous …
Journal: Geophysical Research Letters, Volume 31 (10): n/a-n/a (2004), ISBN . DOI: 10.1029/2004gl019778 Sites: US-MMS
Summer drought is a feature of the semi-arid region of central Oregon, USA, where vegetation naturally develops into ponderosa pine (Pinus ponderosa var. Laws) forest. Forest management consists of clearcut harvest and natural regeneration. Soil microbial activity is interconnected with forest processes because substrate …
Journal: Forest Ecology And Management, Volume 191 (1-3): 201-213 (2004), ISBN . DOI: 10.1016/j.foreco.2003.12.005 Sites: US-Me4, US-Me5
We commend Luo et al. (1) for their effort to extend the analysis of our data (2) …
Journal: Science, Volume 304 (5678): 1745d-1745d (2004), ISBN . DOI: 10.1126/science.1099340 Sites: US-Dk3, US-WBW
Understanding the controls over ecosystem-respired δ13C (δ13CR) is important for applications of isotope-based models of the global carbon budget as well as for understanding ecosystem-level variation in isotopic discrimination (Δ). Discrimination may be strongly dependent on synoptic-scale variation …
Journal: Global Biogeochemical Cycles, Volume 18 (1): n/a-n/a (2004), ISBN . DOI: 10.1029/2003gb002049 Sites: US-Me2, US-Me4
Soil surface CO2 flux (RS) is overwhelmingly the product of respiration by roots (autotrophic respiration, RA) and soil organisms (heterotrophic respiration, RH). Many studies have attempted to partition RS into these two components, with highly …
Journal: Global Change Biology, Volume 10 (10): 1756-1766 (2004), ISBN . DOI: 10.1111/j.1365-2486.2004.00816.x Sites: BR-Ma2, CA-Man, CA-Oas, CA-Obs, US-Dk1, US-Dk2, US-Dk3, US-Ha2, US-Me1, US-Me3, US-Me4, US-Me5, US-WBW
We used two independent approaches, biometry and micrometeorology, to determine the net ecosystem production (NEP) of an old growth forest in Pará, Brazil. Biometric inventories indicated that the forest was either a source or, at most, a modest sink of carbon from 1984 to 2000 (+0.8 ± 2 Mg C·ha−1·yr−1; …
Journal: Ecological Applications, Volume 14 (sp4): 114-126 (2004), ISBN . DOI: 10.1890/02-6005 Sites: BR-Sa3
In this paper, we analyzed 3 years of carbon flux data from continuous eddy covariance measurements to investigate how soil moisture, rain pulses, and growth alter the response of ecosystem respiration …
Journal: Global Biogeochemical Cycles, Volume 18 (4): n/a-n/a (2004), ISBN . DOI: 10.1029/2004gb002281 Sites: US-Ton, US-Var
Biometric techniques were used to measure net ecosystem production (NEP) across three climatically distinct forest chronosequences in Oregon. NEP was highly negative immediately following stand-replacing disturbance in all forests and recovered to positive values by 10, 20, and 30 years of age for the mild and mesic Coast Range, …
Journal: Global Biogeochemical Cycles, Volume 18 (4): n/a-n/a (2004), ISBN . DOI: 10.1029/2004gb002236 Sites: US-Me2, US-Me4