HR: 1340h
AN: B43A-0238    [Abstracts]
TI: Soil respiration in a chronosequence of deciduous forests in the Great Lakes region of the United States
AU: * Tang, J
EM: jtang@umn.edu
AF: University of Minnesota Department of Forest Resources, 1530 Cleveland Ave N, St Paul, MN 55108
AU: Bolstad, P V
EM: pbolstad@umn.edu
AF: University of Minnesota Department of Forest Resources, 1530 Cleveland Ave N, St Paul, MN 55108
AU: Martin, J G
EM: Jonathan.Martin@oregonstate.edu
AF: University of Minnesota Department of Forest Resources, 1530 Cleveland Ave N, St Paul, MN 55108
AB: Chronosequence analysis of soil respiration during forest succession is important for the development of long-term dynamic soil carbon models, and for the assessment of carbon sequestration and carbon management. We measured soil respiration across sites with various forest types and age classes in the Great Lakes region of the United States in the growing seasons of 2004-2005. Our study sites included clear-cut, young aspen, intermediate aspen, mature northern hardwood, and old-growth hardwood stands, covering stand ages from 0 to 350 years old. Monthly measurements of soil respiration with portable chambers were complemented by automated chambers for diurnal patterns. Soil temperature, moisture, soil carbon and nitrogen content, leaf area index, and tree diameters were also recorded at all sites as potential determinants of soil respiration. We found that soil temperature was the primary control for soil respiration at all sites. Baseline soil respiration (at 10°C), soil respiration sensitivity to temperature, and soil microclimate varied with stand age, resulting in the variation of soil respiration in the chronosequence of forest stands. Soil respiration was the highest in the recent clear-cut stands. Soil respiration increased from young stands to mature stands, and then declined in old-growth stands.
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0426 Biosphere/atmosphere interactions (0315)
DE: 0428 Carbon cycling (4806)
DE: 0439 Ecosystems, structure and dynamics (4815)
DE: 1865 Soils (0486)
SC: Biogeosciences [B]
MN: Fall Meeting 2005