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Climatic effect of atmospheric CO2 doubling on radial tree growth in south eastern France

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The climatic effect of a doubling of atmospheric CO2 on radial growth of trees was studied in ten populations of three species in south eastern France using an Atmospheric General Circulation Model (AGCM) predicting a 3°C increase of mean temperature and a light rise of precipitation. Results are based on empirical growth climate models, involving an Artificial Neural Network (ANN) technique. Only two of the studied populations, on the boundaries of their ecological area, are sensitive to the climatic variations. One is the larch (Larix decidua Mill.) population located at 2300 m on elevation (near the timberline) which shows a radial growth increase. The other is the most southern French Scots pine (Pinus sylvestris L.) population which reacts with a severe growth rate reduction.
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Keywords: CO2 doubling; Tree rings; climate model; global change; response function; south eastern France

Document Type: Original Article

Affiliations: Faculté des Sciences et Techniques de St-Jérôme, Case 451, Avenue Escadrille Normandie Niemen, 13397 Marseille cedex 20, France

Publication date: 1997-01-01

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