Title: 1. Sap flux scaled canopy transpiration, stomatal conductance and water use efficiency in an old-growth forest in the Great Lakes region
11. Sap flux scaled canopy transpiration,
stomatal conductance and water use efficiency in
an old-growth forest in the Great Lakes region
2. Carbon allocation in an old-growth
hemlock- northern hardwood forest in the Great
Lakes region
Jianwu Tang and coauthors
2Ongoing projects
- Respiration, production, and carbon allocation in
Sylvania, Willow Creek, and Lost Creek spatial
variation and successional patterns - Canopy transpiration, stomatal conductance, and
water use efficiency - Cross-site soil respiration and automated
measurement of soil respiration (half-hour)
diurnal and seasonal variations and controls - Upscaling
- Comparing Century-type carbon modeling with site
measurements - Comparing high-resolution-imagery-based upscaling
with site measurements
3Transpiration stomatal conductance
photosynthesis Transpiration water use
efficiency photosynthesis
4Granier (1987)
Ewers et al. (1999) Oren et al. (1998)
Monteith and Unsworth (1990)
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11Carbon allocation
- Important in ecosystem carbon modeling fixed
allocation or not? - Important in ecological theory
Odum, 1969, Science
Ryan et al. 1997, Ad. Eco. Res.
12a autotrophic, h heterotrophic, w wood, f
foliage, r root, s soil
13Carbon allocation (g C m-2 year-1)
14Carbon (g C m-2) stored in forests
15NPP (g C m-2 y-1) from wood and foliage for three
species and their percentages in the hardwood and
hemlock stands
16Respiration per ground area (g C m-2 y-1) from
wood and foliage for three species and their
percentages in the hardwood and hemlock stands
17Conclusion
- Component respiration and production vary with
ecosystem type and stand age. - Transpiration studies can be coupled to carbon
studies.