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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Process based model sheds light on climate sensitivity of Mediterranean tree-ring width
Biogeosciences, Volume 9, No. 3, Year 2012
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Description
We use the process-based VS (Vaganov-Shashkin) model to investigate whether a regional Pinus halepensis tree-ring chronology from Tunisia can be simulated as a function of climate alone by employing a biological model linking day length and daily temperature and precipitation (AD 1959-2004) from a climate station to ring-width variations. We check performance of the model on independent data by a validation exercise in which the model's parameters are tuned using data for 1982-2004 and the model is applied to generate tree-ring indices for 1959-1981. The validation exercise yields a highly significant positive correlation between the residual chronology and estimated growth curve (rCombining double low line0.76 p<0.0001, n = 23). The model shows that the average duration of the growing season is 191 days, with considerable variation from year to year. On average, soil moisture limits tree-ring growth for 128 days and temperature for 63 days. Model results depend on chosen values of parameters, in particular a parameter specifying a balance ratio between soil moisture and precipitation. Future work in the Mediterranean region should include multi-year natural experiments to verify patterns of cambial-growth variation suggested by the VS model. © 2012 Author(s).
Authors & Co-Authors
Touchan, Ramzi
United States, Tucson
The University of Arizona
Shishov, Vladimir V.
Russian Federation, Krasnoyarsk
Siberian Federal University
Meko, David M.
United States, Tucson
The University of Arizona
Nouiri, Issam
Tunisia, Tunis
University of Carthage, Institut National Agronomique de Tunisie
Grachev, Alexei M.
Russian Federation, Krasnoyarsk
Siberian Federal University
Statistics
Citations: 60
Authors: 5
Affiliations: 3
Identifiers
Doi:
10.5194/bg-9-965-2012
e-ISSN:
17264189
Study Locations
Tunisia