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- Title
Distribution of Tracheid Lumen Areas within Annual Rings at Different Heights of Larch Stem under Permafrost Conditions. Crown Dieback.
- Authors
Mashukov, D. A.; Ben'kova, A. V.; Ben'kova, V. E.; Shashkin, A. V.; Prokushkin, A. S.
- Abstract
Abstract—In the north-taiga larch forests of Siberia, on permafrost, there is a widespread phenomenon of crown dieback. To reveal the factors causing crown dieback, we have studied the structure of water-conducting system in the stems of stag-headed and healthy trees of Gmelin larch (Larix gmelinii (Rupr.) Rupr.). The analysis of distributions of early (water-conducting) tracheids with respect to the radial lumen diameter at different heights within stems has shown that radial lumen diameters of the most of tracheids decrease along with stem height in all of the studied trees, both healthy and stag-headed; in stag-headed trees, this value was significantly lower than in healthy trees at all heights. The findings confirm the following hypothesis: in the permafrost zone, trees can suffer from water stress, which causes crown dieback in the trees more susceptible to such stress. The high heterogeneity of hydrothermal soil conditions is considered as the main factor determining the differentiation of trees with respect to water stress susceptibility.
- Subjects
SIBERIA (Russia); DIEBACK; PERMAFROST; LARCHES; CROWNS (Botany); TREE height
- Publication
Russian Journal of Ecology, 2021, Vol 52, Issue 5, p391
- ISSN
1067-4136
- Publication type
Article
- DOI
10.1134/S1067413621050106