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Master thesis

Growth and microdensity responses of multiple Douglas fir provenances to drought events in Southern France

Abstract : Forest plays an essential role with strong economic and ecologic values. However, these roles are threatened by the oncoming climate changes. Thus, a better comprehension and assessment of trees’ ability to survive in warmer and dryer climate but mostly to stronger drought event is important. Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) is one of the most important planted trees in Europe and has a vast natural range. In its vast natural range Douglas fir faces various climates. Thus, understanding the variability of Douglas fir's responses within its natural range is a key to select well-adapted provenances for future plantations. Here, the response of Douglas fir coming from four regions is studied: Oregon, Washington, interior California and coastal California planted on two dry differing sites in 1992. The first site considered as the "dry" site is located in Corsica and the second considered as the "wet" site is located in the Gard. The response to drought events is studied using dendroecology and more specifically the resistance, recovery and resilience indices defined by Lloret on the 5 driest years of the dataset. The results show the importance of the testing site when studying drought responses. Similar drought response was obtained between all provenance regions on the moist site but not for the driest site where provenance coming from California showed highest radial growth resilience to the driest years. A trade-off between resistance and recovery is found for the ring width and the maximum density with differing strategies between Californian provenances and the others. Maximum density of the tree ring appears to be a strong marker of the drought events for all sites and provenance regions. As Californian provenances showed the highest overall growth for the dry site combined with the highest drought resilience, these provenances seem to be the most adapted for future plantation on dry sites. On moist site however with low drought risk, planting Californian provenances may result in unnecessary production loss compared to more productive Oregon or Washington provenances.
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Master thesis
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https://hal.inrae.fr/hal-03328830
Contributor : Valentin Bouttier <>
Submitted on : Monday, August 30, 2021 - 1:50:29 PM
Last modification on : Wednesday, September 1, 2021 - 3:24:31 AM

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Valentin Bouttier. Growth and microdensity responses of multiple Douglas fir provenances to drought events in Southern France. Silviculture, forestry. 2020. ⟨hal-03328830⟩

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