首页> 外文期刊>Canadian Journal of Forest Research >Tree-ring evidence for a combined influence of defoliators and extreme climatic events in the dynamics of a high-altitude balsam fir forest, Mount Megantic, southern Quebec
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Tree-ring evidence for a combined influence of defoliators and extreme climatic events in the dynamics of a high-altitude balsam fir forest, Mount Megantic, southern Quebec

机译:在魁北克南部梅根提克山高海拔香脂冷杉森林的动态变化中,落叶者和极端气候事件共同影响的树木年轮证据

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摘要

Most mature balsam fir trees (Abies balsamea (L.) Mill.) growing at the top of Mount Megantic (Quebec) exhibit multiple leaders in the upper crown section, an indication of stressful conditions for tree development in this high-altitude stand. We report here on a detailed dendroecological analysis of windthrown trees showing that multiple stem development was linked to spruce budworm activity during the 1970s. In spite of severe defoliation, damaged trees temporarily restored their vegetative structure by forming reiterated axes. About 9% of all leaders sampled died during a 3-year period (1996-1998), which represents 60% of dead leaders sampled, with tree morbidity and mortality also peaking in 1996. Tree-ring dating of growth anomalies indicated the impact of major snow and (or) ice storms during the 1996 and 1998 winters, two events validated by field observations from the Mount Megantic conservation area authorities. Biotic (defoliators) and extreme climatic events have a combined influence in the dynamics of high-altitude balsam fir forests.
机译:生长在梅加尼克山(魁北克)顶部的大多数成熟的苦瓜冷杉树(Abies balsamea(L.)Mill。)在树冠上部显示出多个领袖,这表明在这种高海拔林分中树木生长面临的压力条件。我们在这里报告了对被风吹倒的树木的详细树状生态学分析,结果表明在1970年代,多茎发育与云杉芽虫活动有关。尽管有严重的落叶,但受损的树木通过形成重复的轴而暂时恢复了其营养结构。大约9%的领导者死亡在3年期间(1996-1998年)死亡,这代表了60%的死亡领导者死亡,树木的发病率和死亡率也在1996年达到顶峰。 1996年和1998年冬季发生的大雪和(或)冰暴,通过梅根特山保护区当局的实地观察证实了两个事件。生物(落叶)和极端气候事件对高海拔香脂冷杉森林的动态产生综合影响。

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