Woody debris (WD) is an important component of forest C budgets, both as a C reservoir and source of CO2 to the atmosphere. We used an infrared gas analyzer and closed dynamic chamber to measure CO2 efflux from downed coarse WD (CWD; diameter≥7.5 cm) and fine WD (FWD; 7.5 cm>diameter≥2 cm) to assess …
Journal: Oecologia, Volume 148 (1): 108-117 (2006). DOI: 10.1007/s00442-006-0356-9 Sites: US-Ha1
The major driving factors of soil CO2 production – substrate supply, temperature, and water content – vary vertically within the soil profile, with the greatest …
Journal: Global Change Biology, Volume 12 (6): 944-956 (2006). DOI: 10.1111/j.1365-2486.2005.01142.x Sites: US-LPH
Atmospheric aerosols from natural and anthropogenic processes have both primary and secondary origins, and can influence human health, visibility, and climate. One key process affecting atmospheric concentrations of aerosols is the formation of new particles and their subsequent growth to larger particle sizes. A field study was …
Journal: Aerosol Science And Technology, Volume 40 (5): 373-388 (2006). DOI: 10.1080/02786820600631896 Sites: US-Blo
Journal: Tree Physiology, Volume 26 (7): 833-844 (2006). DOI: 10.1093/treephys/26.7.833 Sites: US-Blo
The flux of isoprene, one of the more reactive biogenic volatile organic compounds, was measured using eddy covariance techniques on a continuous basis during the 2000–2002 growing seasons at a mixed hardwood forest in northern lower MI. Daytime fluxes of isoprene and both sensible (H) and latent heat flux (LE) were linearly …
Journal: Agricultural And Forest Meteorology, Volume 136 (3-4): 188-202 (2006). DOI: 10.1016/j.agrformet.2004.11.013 Sites: US-UMB
Soil respiration (SR) represents a major component of forest ecosystem respiration and is influenced seasonally by environmental factors such as temperature, soil moisture, root respiration, and litter fall. Changes in these environmental factors correspond with shifts in plant phenology. In this study, we examined the relationship …
Journal: International Journal Of Biometeorology, Volume 51 (2): 135-144 (2006). DOI: 10.1007/s00484-006-0046-7 Sites: US-Oho
Net ecosystem carbon dioxide exchange was measured in two contrasting peatlands in northern Alberta, Canada using the eddy covariance technique during the growing season (May–October). Sphagnum spp. made up approximately 66% of the total LAI (1.52 m2 m−2) at the poor fen and the total N content …
Journal: Agricultural And Forest Meteorology, Volume 140 (1-4): 115-135 (2006). DOI: 10.1016/j.agrformet.2006.03.020 Sites: CA-WP2, CA-WP3
Acetone and methanol have been measured hourly at a rural mountain site in California for a full year, providing a unique data set for analyzing the factors controlling their seasonal cycles. Their mixing ratios showed clear maxima in summer and late spring respectively, and were mostly correlated with atmospheric temperature with …
Journal: Global Biogeochemical Cycles, Volume 20 (1): 1-10 (2006). DOI: 10.1029/2005gb002566 Sites: US-Blo
The usefulness of eddy covariance for understanding terrestrial carbon exchange has been hampered by uncertainty over the magnitude and causes of a systematic underestimation of CO2 efflux on calm nights. We combined in situ measurements of the temperature, wind and CO2 profile with nocturnal Land Surface Temperature …
Journal: Journal Of Geophysical Research, Volume 111 (D8): n/a-n/a (2006). DOI: 10.1029/2005jd006037 Sites: BR-Sa3
Soil moisture affects microbial decay of SOM and rhizosphere respiration (RR) in temperate forest soils, but isolating the response of soil respiration (SR) to summer drought and subsequent wetting is difficult because moisture changes are often confounded with temperature variation. We distinguished between temperature and moisture …
Journal: Global Change Biology, Volume 12 (2): 177-193 (2006). DOI: 10.1111/j.1365-2486.2005.001058.x Sites: US-LPH