Simulating the physiological basis of tree ring responses to environmental changes
The detection of possible forest growth responses to changes in atmospheric CO/sub 2/ or air pollutants is very difficult by statistical analysis of tree ring chronologies, and a complementary modeling approach has been initially tested. In this new approach, a linked set of mechanistic transport models of carbon, water, and chemical dynamics in soil-plant-litter systems (UTM) is used to generate a matrix of simulated annual stem-wood increment and winter carbon storage values for a range of degree day, water stress, and atmospheric CO/sub 2/ concentrations. These values represent potential tree growth responses as determined by hourly time-step physiological processes. The matrix is accessed by a forest succession model (FORET) according to selected degree day and water stress values or by use of actual site data. These potential growth responses are modified to realized annual increments according to the competition algorithms of the succession simulator using yearly time steps. A 12% increase in stem-wood production was predicted for an oak-hickory (Quercus-Carya spp.) forest in eastern Tennessee by the UTM for both a change in atmospheric CO/sub 2/ from 260 to 340 and from 340 to 600 ..mu..L/L.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6607501
- Report Number(s):
- CONF-8804148-5; ON: DE89004168
- Resource Relation:
- Conference: Conference on forest growth: process modeling of responses to environmental stress, Gulf Shores, AL, USA, 19 Apr 1988; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
59 BASIC BIOLOGICAL SCIENCES
09 BIOMASS FUELS
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
CARBON DIOXIDE
BIOLOGICAL EFFECTS
PLANT GROWTH
FORECASTING
TREE RINGS
COMPARATIVE EVALUATIONS
AIR POLLUTION
CARBON DIOXIDE FIXATION
CELLULOSE
COMBUSTION PRODUCTS
EARTH ATMOSPHERE
F CODES
FORESTS
MATHEMATICAL MODELS
SIMULATION
TISSUE DISTRIBUTION
TREES
CARBOHYDRATES
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
COMPUTER CODES
DISTRIBUTION
GROWTH
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PLANTS
POLLUTION
POLYSACCHARIDES
SACCHARIDES
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Atmospheric- Chemicals Monitoring & Transport- (-1989)
510200 - Environment
Terrestrial- Chemicals Monitoring & Transport- (-1989)
550501 - Metabolism- Tracer Techniques
140504 - Solar Energy Conversion- Biomass Production & Conversion- (-1989)
560300 - Chemicals Metabolism & Toxicology