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<p>In recent decades, Siberian fir has been dying in the Southern Siberia Mountains. The decline in the vitality of fir is attributed to a complex process involving the interaction of several factors that lead to increased tree mortality. At present, some fir trees die in mountain forest ecosystems of the Eastern Sayan at the altitudes of more than 680&#xa0;m above sea level. There are needle chlorosis and necrosis in the subapical part of the tree as well as loss of the plagiotropism of branches. The structure of stem wood of healthy and damaged fir trees have been studied. <i>Abies sibirica</i> Ledeb. damaged trees exhibited xylem structural changes even at the initial stage of disturbance: radial sizes of tracheids and their lumens decreased, cell walls grew thicker, their cross-section areas decreased, and traumatic resin canals formed. These features appeared to be a characteristic of trees vigour and contribute to the natural selection.</p>

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The anatomical traits of stem wood of damaged Siberian fir trees

  • 期刊论文

  • 发表日期：

    2024年12月31日

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  • Elena V. Bazhina,
  • Victoria V. Stasova

摘要

In recent decades, Siberian fir has been dying in the Southern Siberia Mountains. The decline in the vitality of fir is attributed to a complex process involving the interaction of several factors that lead to increased tree mortality. At present, some fir trees die in mountain forest ecosystems of the Eastern Sayan at the altitudes of more than 680 m above sea level. There are needle chlorosis and necrosis in the subapical part of the tree as well as loss of the plagiotropism of branches. The structure of stem wood of healthy and damaged fir trees have been studied. Abies sibirica Ledeb. damaged trees exhibited xylem structural changes even at the initial stage of disturbance: radial sizes of tracheids and their lumens decreased, cell walls grew thicker, their cross-section areas decreased, and traumatic resin canals formed. These features appeared to be a characteristic of trees vigour and contribute to the natural selection.