He Minhui, Sylvain Jean-Daniel, Silvestro Roberto, Drolet Guillaume, Arsenault Richard, Rossi Sergio
Laboratoire sur les écosystèmes terrestres boréaux, Département des Sciences Fondamentales, Université du Québec à Chicoutimi, Chicoutimi, QC, Canada.
Centre de Géomatique du Québec, Chicoutimi, QC, Canada.
Front Plant Sci. 2025 Jul 10;16:1563051. doi: 10.3389/fpls.2025.1563051. eCollection 2025.
Understanding the effects of climate variability on tree growth is crucial to predict forest carbon sequestration under global climate change. This study investigates the dynamics of wood formation in balsam fir in response to historical climatic data and projected variations. Weekly microcores were collected from 33 permanent plots in a boreal forest in Québec, Canada, over five growing seasons from 2018 to 2022. Warmer spring temperatures were associated with earlier cell enlargement initiation and increased cell production, whereas precipitation exerted a limited effect. An advancement in the onset of cell enlargement by 14-42 days and a 25-85% increase in cell production from 2051-2080 relative to the reference period (1981-2010) were predicted. Our results reveal potential shifts in growth dynamics and xylem production that could modify the growth processes in balsam fir, including carbon sequestration in the boreal forest ecosystems of Eastern Canada.
了解气候变异性对树木生长的影响对于预测全球气候变化下的森林碳固存至关重要。本研究调查了香脂冷杉木材形成的动态变化，以响应历史气候数据和预计的变化。在2018年至2022年的五个生长季节中，从加拿大魁北克省北方森林的33个永久样地收集了每周的微芯。春季气温升高与细胞扩大起始提前和细胞产量增加有关，而降水的影响有限。预计与参考期（1981-2010年）相比，2051-2080年细胞扩大开始时间提前14-42天，细胞产量增加25-85%。我们的结果揭示了生长动态和木质部生产的潜在变化，这些变化可能会改变香脂冷杉的生长过程，包括加拿大东部北方森林生态系统中的碳固存。
