HR: 1340h
AN: B53B-1189    [Abstracts]
TI: Upscaling Carbon Fluxes from Stand-Level Towers to the Footprint of a Very Tall Tower in a Heterogeneous Landscape
AU: * Saliendra, N
EM: nsaliendra@fs.fed.us
AF: USDA Forest Service, Forestry Sciences Lab 5985 Highway K, Rhinelander, WI 54501, United States
AU: Kubiske, M
AF: USDA Forest Service, Forestry Sciences Lab 5985 Highway K, Rhinelander, WI 54501, United States
AU: Teclaw, R
AF: USDA Forest Service, Forestry Sciences Lab 5985 Highway K, Rhinelander, WI 54501, United States
AU: Kolka, R
AF: USDA Forest Service, Forestry Sciences Lab 1831 Hwy. 169 E., Grand Rapids, MN 55744, United States
AU: Davis, K
AF: Pennsylvania State University, Department of Meteorology 512 Walker Building, University Park, PA 16802, United States
AU: Cherrey, K
AF: Pennsylvania State University, Department of Meteorology 512 Walker Building, University Park, PA 16802, United States
AU: Desai, A
AF: Pennsylvania State University, Department of Meteorology 512 Walker Building, University Park, PA 16802, United States
AU: Ricciuto, D
AF: Pennsylvania State University, Department of Meteorology 512 Walker Building, University Park, PA 16802, United States
AU: Bolstad, P
AF: University of Minnesota, Department of Forest Resources 1530 Clevelnad Ave, N., St. Paul, MN 55110, United States
AU: Cook, B
AF: University of Minnesota, Department of Forest Resources 1530 Clevelnad Ave, N., St. Paul, MN 55110, United States
AU: Anderson, R
AF: University of Minnesota, Department of Forest Resources 1530 Clevelnad Ave, N., St. Paul, MN 55110, United States
AU: Heinsch, F
AF: University of Montana, College of Forestry & Conservation 437 CHCB, Missoula, MT 59812, United States
AB: Eddy covariance fluxes measured from a very tall tower (~400 m, WLEF near Park Falls, WI) have indicated that the heterogeneous landscape surrounding the WLEF tower has been a weak CO2 source. Carbon fluxes derived from stand-level towers, however, have indicated that mature hardwood forest, willow-alder wetland, and old- growth mixed forest were CO2 sinks. We hypothesized that potential CO2 sources from wetlands and clearcuts could be prevalent within WLEF footprint, thus making it a weak CO2 source. We tested this hypothesis by deploying two roving eddy covariance systems to measure carbon fluxes in two clearcuts (~ 1 and 4 years old in 2005) and two wetlands (ericaceous bog and sedge fen) during the 2005-06 growing seasons. We modeled ecosystem respiration (Re) with night-time NEE (net ecosystem exchange for CO2) versus temperature relationships. Daytime gross ecosystem production (GEP), calculated as Re minus observed NEE, was modeled as a function of photosynthetically active radiation. We observed a wide range of carbon fluxes (e.g., NEE ranged from -548 to 152 g C m-2) for the entire growing season (150 days in May to October 2005) among the six stand-level ecosystems. Measurements from stand-level towers are used to upscale carbon fluxes to the landscape level, i.e., footprint around the very tall tower (WLEF). Remotely sensed data at various spatial resolutions (e.g., MODIS and QuickBird) are used to classify forest ecosystems. Upscaling of carbon fluxes is achieved through integration of flux tower data with forest classification. We expect that carbon fluxes measured from clearcuts and wetlands will substantially improve our ability to upscale local observations to the region.
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0330 Geochemical cycles (1030)
DE: 0428 Carbon cycling (4806)
DE: 3339 Ocean/atmosphere interactions (0312, 4504)
DE: 4806 Carbon cycling (0428)
SC: Biogeosciences [B]
MN: 2007 Fall Meeting