HR: 0800h
AN: B51A-0938    [Abstracts]
TI: Ecosystem Respiration and its Components in an Old-growth and a Mature Northern Forest
AU: * Tang, J
EM: jtang@umn.edu
AF: University of Minnesota, Department of Forest Resources , 1530 Cleveland Ave N, St Paul, MN 55108 United States
AU: Bolstad, P V
EM: pbolstad@umn.edu
AF: University of Minnesota, Department of Forest Resources , 1530 Cleveland Ave N, St Paul, MN 55108 United States
AU: Desai, A R
EM: adesai@psu.edu
AF: Pennsylvania State University, Department of Meteorology, 503 Walker Building, University Park, PA 16802 United States
AU: Martin, J G
EM: mart0166@umn.edu
AF: University of Minnesota, Department of Forest Resources , 1530 Cleveland Ave N, St Paul, MN 55108 United States
AU: Cook, B D
EM: bcook@met.psu.edu
AF: University of Minnesota, Department of Forest Resources , 1530 Cleveland Ave N, St Paul, MN 55108 United States
AU: Davis, K J
EM: davis@essc.psu.edu
AF: Pennsylvania State University, Department of Meteorology, 503 Walker Building, University Park, PA 16802 United States
AB: Ecosystem respiration is important in global carbon cycling and may be more sensitive than photosynthesis to environmental conditions in influencing net ecosystem productivity. Total ecosystem respiration and its component fluxes such as soil, stem and leaf respiration vary with vegetation age, species composition and local climate. We measured ecosystem respiration and its components using chambers in an old-growth and a mature northern forest in northern Wisconsin and Michigan in a similar climate condition. Chamber measurements were compared with continuous eddy covariance measurements. Total ecosystem respiration measured from chambers was about 1 kgC m$^{-2}$ year$^{-1}$ in the mature forest and 0.9 kgC m$^{-2}$ year$^{-1}$ in the old-growth in 2002. This result agreed well with eddy covariance measurements from the old-growth but not from the mature forest. Our results indicate that the old-growth forest had less respiration, less photosynthesis, and less net ecosystem exchange than the nearby mature forest. Forest succession significantly influences carbon dynamics.
DE: 4805 Biogeochemical cycles (1615)
DE: 4806 Carbon cycling
DE: 4815 Ecosystems, structure and dynamics
DE: 1615 Biogeochemical processes (4805)
DE: 0315 Biosphere/atmosphere interactions
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting