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Carbon uptake

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    • 1. cebitz. n coScie m Topic 6: The issue of global warming Just plant more trees???? cebitz. n co Scie m
    • 2. Topic 6: The issue of global warming 6.1.5: Management strategies to address global warming Cant we just plant more trees? The media often present planting more trees as a possible solution to global warming. While trees, just as like every plant, do absorb carbon dioxide from the atmosphere and sequestrate (convert) it into plant tissue. Can they provide a real cebitz. answer? n coScie m
    • 3. Topic 6: The issue of global warming 6.1.5: Management strategies to address global warming Cant we just plant more trees? CO The theory During photosynthesis plants absorb CO2 from the atmosphere which combines with water and minerals from the soil to make new plant material as the plant grows. HO Trees being big plants absorb lots of cebitz. CO2 as they grow (carbon fixation) n coScie m
    • 4. Topic 6: The issue of global warming 6.1.5: Management strategies to address global warming How much carbon do trees fix? Age of trees Carbon fixed each year Cumulative amount of carbon fixed (years) (t C ha-1 year-1) (t C ha-1) 5 0.2 0.2 10 7.0 21.0 15 14.0 77.0 20 21.0 167.8 cebitz. n coScie m Based on an idea from: Problem Solving in Environmental Biology; A.R Ennos and S.E.R Bailey; 1995 Longman Science
    • 5. Topic 6: The issue of global warming 6.1.5: Management strategies to address global warming How much carbon do trees fix? Carbon fixation by Pine trees Cumulative amount of carbon fixed (t C / ha 200 When tree saplings are very young the rate of respiration is almost 150 equal to photosynthesis so the 100 amount of carbon fixed is negligible. 50 From around year 5 the rate of photosynthesis exceeds respiration. 0 0 5 10 15 20 cebitz. Tree age (years) n coScie m Based on an idea from: Problem Solving in Environmental Biology; A.R Ennos and S.E.R Bailey; 1995 Longman Science
    • 6. Topic 6: The issue of global warming 6.1.5: Management strategies to address global warming So what does that mean? Imagine an average European engineering factory producing around 200 t C year -1 This would mean that if you planted trees today, in 20 Certainly not an years (how long it takes the tress to grow) the factory average factory would produce 200 x 20 = 4000 t C If 1 ha of trees absorbs 167.8 t C in 20 years then you would need 4000/167.8 = 23.8 ha of trees just to absorb cebitz. the carbon from one small factory n coScie m Based on an idea from: Problem Solving in Environmental Biology; A.R Ennos and S.E.R Bailey; 1995 Longman Science
    • 7. Topic 6: The issue of global warming 6.1.5: Management strategies to address global warming Cant we just plant more trees? The Conclusion - NO Actually planting trees to offset the carbon footprint of the developed world would need many millions of hectares of available land. Reforestation is more important for preserving and restoring habitats than it is for reducing the effects of increased CO2 cebitz. n coScie m Based on an idea from: Problem Solving in Environmental Biology; A.R Ennos and S.E.R Bailey; 1995 Longman Science

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