Adaptive variation to changing environmental conditions among Scots pine populations of Central and Eastern Europe
Résumé
Acute and/or chronic stress induced by hotter droughts related to climate change are affecting forest ecosystems. Understanding how trees adjust carbon gain relative to the availability of other resources, such as water, under drought conditions is thus crucial for guiding the recommendation of future resilient plant material. As part of the project Genforfutur (ARD Sycomore), which aims at identifying climate-proof genetic resources for future forest plantation in the region Centre-Val de Loire (FRANCE), we report findings related to intraspecific variations in growth and water-use strategies along a ca. 25-year temporal sequence for 23 provenances of Scots pine (Pinus sylvestris L.) planted at two distinct common garden field tests. Growth and water-use strategies are being assessed retrospectively by combining dendroecology and the dual carbon-oxygen isotope approach. This presentation will focus on how growth provenance performance is related (1) to the climate at provenance origin, and (2) to the climate at the common garden test sites. Preliminary findings related to the dual isotope approach on a subset of provenances will also be presented providing immediate perspectives for the larger-scale understanding of physiological strategies underlying resilience to hotter-droughts in Pinus sylvestris.
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