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Isolating and investigating the components of biosphere - atmosphere gas exchange with process-based models and measurements of stable isotopes

Obiettivo

The aim of this proposal is to improve our understanding of mechanisms, controlling factors and coupling of gas exchange between the atmosphere and terrestrial ecosystems. On the one hand, we have a solid understanding of gas exchange processes at the leaf/cell level. On the other hand, we need to interpret data at the ecosystem scale. We will employ stable isotope techniques to bridge the gap between the two.Physical transport or biological activity during plant and soil gas exchange produce simultaneous changes in the concentrations and isotopic signatures of gases in canopy air. The interpretation of such changes requires a process-based knowledge of the isotopic signatures of ecosystem fluxes and their natural variability. To this end,1. we will develop a process-based model of ecosystem isotopic gas exchange. The model will simulate carbon, oxygen and water fluxes and their isotopic signatures in a novel multi-tracer approach to account for the close coupling of the cycling of carbon, oxygen and water at the ecosystem level.2. we will calibrate the model with measurements of the isotopic signatures of gas exchange during photosynthesis and respiration and during ecosystem gas exchange. A combination of chamber and eddy covariance techniques will be applied to provide flux and integrated ecosystem observations.3. we will determine in laboratory experiments the plant metabolic parameters relating to leaf/cell level mechanisms that are not well constrained but important for model predictions and the interpretation of field measurements.The process-based knowledge of isotopic gas exchange will directly contribute to ongoing efforts to partition ecosystem exchanges into photosynthesis and respiration. It will also improve the capacity of stable isotope methods as tools for the quantification and prediction of carbon sources and sinks. Thus, it addresses research needs identified in the EU Scientific Work Programme, Global Change and Ecosystems.

Invito a presentare proposte

FP6-2002-MOBILITY-6
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THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF CAMBRIDGE
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