R\u00e9sum\u00e9<\/strong> <\/span>:<\/p>\nEuropean forests have experienced several droughts and heat waves in recent years leading to an increasing level of tree dieback. Quantifying the effects of dieback on tree growth is a crucial issue for forest managers. We monitored tree crown defoliation and tree growth for sessile oak and Scots pine from 2020 to 2023 in the OPTMix experimental network located in central France. We quantified the relationship between tree growth and tree crown defoliation under varying neighborhood conditions. We hypothesized that crown defoliation, tree size and neighborhood competition (local density and composition) would all affect tree growth. We carried out a magnitude analysis to quantify the importance of these different effects on tree growth. We showed that crown defoliation had a strong negative effect for sessile oak (-19.5\u202f% of growth from 42\u202f% to 57\u202f% of defoliation) and a very strong negative effect for Scots pine (-29.5\u202f% of growth from 39\u202f% to 51\u202f% of defoliation). Tree size and neighborhood density had the strongest effects on tree growth for both species, with, respectively, a positive and a negative effect. The proportion of heterospecific species in the neighborhood had the weakest effect, and was positive for sessile oak and negative for Scots pine. We found no interaction between crown defoliation and other predictors, thus indicating that they do not modify the relationship between crown defoliation and radial growth for either species. Forest managers can use defoliation as a rapid indicator of tree health and to help them assess the impact of defoliation on tree growth in various oak-pine forests.<\/p>\n
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Un article vient de para\u00eetre dans la revue \u00ab Forest Ecology and Management \u00bb sur l\u2019impact du d\u00e9ficit foliaire sur la croissance du ch\u00eane sessile et du pin sylvestre suite \u00e0 des \u00e9v\u00e8nements de s\u00e9cheresse caniculaire : Javoy, T., Perret, S., Couteau, C., Perot, T., 2025. Impact of defoliation on tree growth for sessile oak … <\/p>\n
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