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État sanitaire et croissance radiale des arbres : Analyse spatiale et temporelle des données du réseau systématique de suivi des dommages forestiers

Abstract : For the past 30 years, annual visual assessments of crown condition, on the French part of the transnational monitoring network (ICP Forests, level 1), was essential for monitoring forest health. However, the use of crown condition as an indicator of tree health is regularly questioned for methodological reasons but also because of the lack of knowledge on the determinism of crown condition and its functional impact on the tree. In this context, and through the records of 9 tree species’ crown condition (deciduous and coniferous) spread over more than 300 plots in France, we have 1) described and interpreted the spatial and inter-annual variations of leaf loss, in addition to 2) discussing the use of crown condition as an indicator of tree health status based on the joint analysis of inter-annual variations of leaf loss and radial growth. The analysis of spatial variations in crown condition between plots showed multiple relationships with edaphic and climatic factors, but with relatively moderate explanatory power. The study of inter-annual variations in crown condition confirmed that the climatic factors of the previous year control crown condition of the current year. However, compared to radial growth, crown condition presents a less dynamic and inconsistent response to climate between trees in the same plot. The joint analysis of the two signals showed the existence of a weak link between growth and crown condition. We only observed a decrease in tree growth in the case of important leaf loss during years of extreme climatic hazards (dry or cold). However, the introduction of leaf loss as a predictor of radial growth had little or no significant effect for beech and fir. Finally, the evidence of the major influence of age on leaf loss precludes the interpretation of raw crown condition as an indicator of tree health.
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  • HAL Id : tel-03176522, version 1

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Clara Tallieu. État sanitaire et croissance radiale des arbres : Analyse spatiale et temporelle des données du réseau systématique de suivi des dommages forestiers. Ecologie, Environnement. Université de Lorraine, 2020. Français. ⟨NNT : 2020LORR0185⟩. ⟨tel-03176522⟩

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