1. Carbon Flows in Forest Ecosystems with relation to climate change Andy Cross Using stable isotopes to study carbon flows in forest ecosystems with relation to climate change Andy Cross

2. Carbon dynamics in terrestrial ecosystems CO 2 efflux Biomass partitioning CO 2 uptake Plant Soil Soil Organic Matter Stable soil organic carbon turnover Litter input, rhizodeposition, exudation turnover Atmosphere DOC leaching

3. The Carbon Cycle 122 in, 60 out1-2 out 60 out6.5 out 92 in, 90 out Ecosystem store = ~2600 Units are GtC per year for fluxes, GtC for stores. 1Gt = 1 billion tonnes

4. Global Soil Carbon

5. Stable isotopes as measurements of ecological change

6. Tunable Diode Laser – CO 2 13 C 18 O, 10 measurements per second

7. Project Plan – Laboratory Manipulations Sweden, Abisko? (ABACUS) Sweden (carboE) Scotland (Griffin) England (Harwood) Bordeaux (INRA) Portugal Kenya? Mozambique?

8. Project Plan – Field Experiments Harwood Forest Bordeaux Eddy co-variance Large amounts of data!!! Carbon isotope fluxes Latitudinal Ecosystem Models Incorporate results into SPA and carbon cycle models Modelling Soil chamber measurements Root measurements Tree chamber measurements