Abstract
The potential effects of global changes on forests are of increasing concern. Dendrochronology, which deals with long-term records of tree growth under natural environmental conditions, can be used to evaluate the impact of climatic change on forest productivity. However, assessment of climatic change impacts must be supported by accurate and reliable models of the relationships between climate and tree growth. In this study, a bioclimatic model is used to explore the relationships between tree radial growth and bioclimatic variables closely related to the biological functioning of a tree. This model is at an intermediate level of complexity between purely empirical and process-based models. The method is illustrated with data for 21 Aleppo pine (Pinus halepensis Mill.) stands grown under a Mediterranean climate in south-east France. The results show that Aleppo pine growth is mainly controlled by soil water availability during the growing season. The bioclimatic variable which best expresses the observed inter-annual tree growth variations is the actual evapotranspiration (AET). Four parameters were adjusted to simulate dendrochronological data: the soil water capacity, the wilting point, the minimum temperature for photosynthesis, and the end of the growing season. The bioclimatic model gives better results than the standard response function and provides better insight into the functional processes involved in tree growth. The convincing results obtained by the bioclimatic model as well as the limited numbers of parameters it requires demonstrate the feasibility of using it to explore future climatic change impacts on Aleppo pine forests.
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Acknowledgements
This research was funded by the European Community through the FORMAT project (contract ENV4-CT97-0641), the SO&P project (contract ENK2-CT-2002-00160) and through a Marie Curie post-doctoral Individual Fellowship (contract EVK2-CT-2002-50021). This study was also supported by the Ministère Français de la Recherche through an individual PhD thesis fellowship. Meteorological data were provided by Météo France. Christian Ripert and Roland Estève helped collect field data. The authors would like to thank Keith Briffa and Jean-Luc Dupouey for their critical review of this paper and the two anonymous reviewers whose comments were helpful in improving the final manuscript.
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Appendix
Appendix
Variables and acronym definitions
Category | Name | Code | Type/unit |
---|---|---|---|
Tree-ring variable | Early wood density | ED | kg m−3 |
Early wood width | EW | mm | |
Late wood density | LD | kg m−3 | |
Late wood width | LW | mm | |
Tree growth index | TGI | Index | |
Climate variable | Sum of annual rainfalls | P | mm |
Sum of summer rainfalls | SUP | mm | |
Mean annual temperature | T | °C | |
Bioclimatic variable | Annual actual evapotranspiration | AET | mm |
Annual potential evapotranspiration | PET | mm | |
AET/PET | α | Index | |
Annual constrained evapotranspiration | CAET | mm | |
Growing degree-days above t°C | GDDt | °C | |
Mean temperature of the coldest month | MTCO | °C | |
Soil moisture | SM | mm | |
Topography variable | Stand slope | PENT | ° |
Confinement | CONF | ° | |
IKR | Index | ||
Geology variable | Bedrock slope | PENS | Semi-quantitative |
Bedrock fissuring | FISY | Semi-quantitative | |
Soil variable | Mean corer test | TARM | cm |
Variation coefficient of corer test | TARV | % | |
Total depth | PRFT | cm | |
Texture | TEXT | Semi-quantitative | |
Percentage of gross material | EG%T | % | |
Vegetation structure variable | Rocks cover | BLOC | Semi-quantitative |
Liter cover | LITA | Semi-quantitative | |
Total cover | RCVT | Semi-quantitative | |
Aleppo pine total cover | RPAT | Semi-quantitative | |
Bioclimatic model parameter | Soil water capacity | SWC | mm |
First threshold relative to soil humidity | WILT | % | |
Second threshold relative to temperature | WARMTH | °C | |
Third threshold stops the growing season | EGS | Day number |
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Rathgeber, C.B.K., Misson, L., Nicault, A. et al. Bioclimatic model of tree radial growth: application to the French Mediterranean Aleppo pine forests. Trees 19, 162–176 (2005). https://doi.org/10.1007/s00468-004-0378-z
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DOI: https://doi.org/10.1007/s00468-004-0378-z