The age-dependent variability of ecosystem carbon (C) fluxes was assessed by measuring the net ecosystem exchange of C (NEE) in five managed forest stands in northern Wisconsin, USA. The study sites ranged in age from 3-year-old clearcut to mature stands (65 years). All stands, except the clearcut, …
Journal: Ecosystems, Volume 10 (2): 187-203 (2007), ISBN . DOI: 10.1007/s10021-007-9018-y Sites: US-Wi0, US-Wi1, US-Wi2, US-Wi3, US-Wi4, US-Wi6, US-Wi8
We determined concentrations and fluxes of dissolved organic carbon (DOC) in precipitation, throughfall, forest floor and mineral soil leachates from June 2004 to May 2006 across an age-sequence (2-, 15-, 30-, and 65-year-old) of white pine (Pinus strobus L.) forests in southern Ontario, Canada. …
Journal: Biogeochemistry, Volume 86 (1): 1-17 (2007), ISBN . DOI: 10.1007/s10533-007-9138-7 Sites: CA-TP3, CA-TP4
Understanding relationships between canopy structure and the seasonal dynamics of photosynthetic uptake of CO2 by forest canopies requires improved knowledge of canopy phenology at eddy covariance flux tower sites. We investigated whether digital …
Journal: Oecologia, Volume 152 (2): 323-334 (2007), ISBN . DOI: 10.1007/s00442-006-0657-z Sites: US-Bar
Although mature black spruce forests are a dominant cover type in the boreal forest of North America, it is not clear how their carbon (C) budgets vary across the continent. …
Journal: Global Change Biology, Volume 13 (1): 89-107 (2007), ISBN . DOI: 10.1111/j.1365-2486.2006.01281.x Sites: CA-Man, CA-Obs, CA-Qfo
We used a single-beam, first return profiling LIDAR (Light Detection and Ranging) measurements of canopy height, intensive biometric measurements in plots, and Forest Inventory and Analysis (FIA) data to quantify forest structure and ladder fuels (defined as vertical fuel continuity between the understory and canopy) in the New Jersey …
Journal: Remote Sensing Of Environment, Volume 108 (2): 123-129 (2007), ISBN . DOI: 10.1016/j.rse.2006.09.032 Sites: US-Ced, US-Slt
Climate, vegetation cover, and management create finescale heterogeneity in unirrigated agricultural regions, with important but not well-quantified consequences for spatial and temporal variations in surface CO2, water, and heat fluxes. Eddy covariance fluxes were measured in seven agricultural fields—comprising winter wheat, …
Journal: Earth Interactions, Volume 11 (17): 1-21 (2007), ISBN . DOI: 10.1175/EI231.1 Sites: US-ARM
Journal: Tellus, Volume 59B: 223-233 (2007), ISBN . DOI: Sites: US-Uaf
Journal: J. Agric. Meteorol., Volume 63: 171-183 (2007), ISBN . DOI: Sites: US-Uaf
CO2 transport processes relevant for estimating net ecosystem exchange (NEE) at the Niwot Ridge AmeriFlux site in the front range of the Rocky Mountains, Colorado, USA, were investigated during a pilot experiment. We found that cold, moist, and CO2-rich air was transported downslope at night and upslope in the early morning at this …
Journal: Agricultural And Forest Meteorology, Volume 145 (1-2): 1-21 (2007), ISBN . DOI: 10.1016/j.agrformet.2007.02.007 Sites: US-NR1
Separation of the net ecosystem exchange of CO2 (F) into its component fluxes of net photosynthesis (FA) and nonfoliar respiration (FR) is important in understanding the physical and environmental controls on these fluxes, and how these fluxes may respond to environmental change. In this paper, we evaluate a partitioning method based …
Journal: Journal Of Geophysical Research: Biogeosciences, Volume 112 (G3): n/a-n/a (2007), ISBN . DOI: 10.1029/2006JG000282 Sites: US-NR1