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Cambial activity, wood formation and sapling survival of Pinus halepensis exposed to different irrigation regimes |
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| Authors: | Martin de Luis Klemen Novak José RaventósJo?ica Gri?ar Peter PrislanKatarina ?ufar |
| Institution: | a Departamento de Geografía y O.T., C/Pedro Cerbuna 12, Universidad de Zaragoza, 50009 Zaragoza, Spain b Departamento de Ecología, Universidad de Alicante, Carretera S. Vicente del Raspeig s/n, 03080 San Vicente del Raspeig, Alicante, Spain c Biotechnical Faculty, Department of Wood Science and Technology, University of Ljubljana, Ro?na dolina, Cesta VIII/34, 1000 Ljubljana, Slovenia d Slovenian Forestry Institute, Ve?na pot 2, SI-1000 Ljubljana, Slovenia |
| Abstract: | Wood formation and the anatomical characteristics of tree-rings play a decisive role in plant performance and survival due to the importance of water transport. Saplings may be especially vulnerable to water stress; however, the level of water stress that they can endure still remains largely unexamined. Thus, the general objective of our research is to determine the plasticity of wood formation in Pinus halepensis saplings. We evaluated cambial activity, xylem growth ring formation and its anatomical characteristics in different experimental irrigation conditions and tested for its influence on the success rate of sapling establishment. Our results demonstrate a high phenological plasticity in wood formation with juvenile P. halepensis saplings in relation to water availability. Dry conditions during spring and summer strongly limit their cambial activity, which is suggested to be linked to sapling survival during summer. Width and anatomical characteristics of tree-rings differ in saplings exposed to different irrigation conditions. Our results suggest that increasing water stress during spring and summer periods, as predicted by future climate change scenarios, may seriously affect the success of both natural regeneration and reforestation of P. halepensis, and this could severely modify potential distribution of the species. |
| Keywords: | Tree-ring Cambium Xylogenesis Aleppo pine Mediterranean Intra-annual density fluctuations |
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