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Vegetation dynamics--simulating responses to climatic change.
1NERC Centre for Terrestrial Carbon Dynamics and Department of Animal & Plant Sciences, University of Sheffield, Sheffield, S10 2TN, UK. f.i.woodward@sheffield.ac.uk
Biological Reviews of the Cambridge Philosophical Society
|September 16, 2004
Summary
This study introduces a vegetation dynamics model (SDGVM) to simulate carbon sequestration and environmental change responses. While global carbon sink predictions align with measurements, local discrepancies highlight soil respiration uncertainties.
Area of Science:
- Ecology and Environmental Science
- Climate Change Modeling
- Biogeochemical Cycles
Background:
- Vegetation dynamics are crucial for understanding carbon sequestration and environmental change.
- Accurate simulation of vegetation processes like growth, mortality, and carbon exchange is essential.
- Existing models require validation against diverse observational data across various scales.
Purpose of the Study:
- To develop and test a dynamic global vegetation model (SDGVM) for simulating vegetation responses to environmental change.
- To investigate carbon sequestration processes, including CO2 fertilization effects.
- To project future changes in the terrestrial carbon sink under global warming scenarios.
Main Methods:
- Development of the Sheffield Dynamic Global Vegetation Model (SDGVM) incorporating key ecological processes.
- Model validation using independent data sources across local to global scales.
- Comparison of simulated carbon fluxes (Net Ecosystem Production) with eddy covariance observations.
Main Results:
- The SDGVM successfully simulates vegetation dynamics and carbon sequestration across scales.
- Significant discrepancies were found between simulated and measured Net Ecosystem Production at local scales, potentially linked to soil respiration.
- Global Net Biome Production simulations showed good agreement, suggesting local flux measurements may not be globally representative.
- A notable CO2 fertilization effect on carbon sequestration was simulated for the 20th century.
- Future projections indicate a substantial decline in the terrestrial carbon sink's capacity to absorb anthropogenic CO2 emissions under global warming.
Conclusions:
- The SDGVM provides a robust framework for studying vegetation dynamics and carbon cycling.
- Further research is needed to refine the representation of soil respiration in vegetation models.
- The terrestrial carbon sink is projected to diminish significantly with future climate change, impacting global carbon budgets.