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| Titel |
Response of Pinus sylvestris roots to sheet-erosion exposure: an anatomical approach |
| VerfasserIn |
J. M. Rubiales, J. M. Bodoque, J. A. Ballesteros, A. Diez-Herrero |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 8, no. 2 ; Nr. 8, no. 2 (2008-03-18), S.223-231 |
| Datensatznummer |
250005404
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| Publikation (Nr.) |
 copernicus.org/nhess-8-223-2008.pdf |
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| Zusammenfassung |
| Anatomical changes of exposed tree roots are valuable tools to date erosion
events, but the responses of diverse species under different types of
erosion need still to be studied in detail. In this paper we analyze the
histological changes that occur in roots of Scots pine (Pinus sylvestris L.) subjected to
continuous denudation. A descriptive and quantitative study was conducted in
the Senda Schmidt, a popular trail located on the northern slope of the
Sierra de Guadarrama (Central Iberian System, Spain). Measurement of
significant parameters allowed the moment of exposure of the roots to be
identified. These parameters were: a) width of the growth ring; b) number of
cells per ring; c) percentage of latewood and d) diameter of cellular light
in earlywood. A one-way analysis ANOVA was also carried out in order to
establish statistically significant differences between homogeneous groups
of measurements in pre-exposed and exposed roots. Based on these analyses,
Scots pine roots show a remarkable anatomical response to sheet-erosion
exposure. Increased growth in the ring is accompanied by a slight reduction
of the cell lumina of the earlywood tracheids. At the end of the ring,
several rows of thick-walled tracheids define latewood tissue and visible
annual borders very clearly. Furthermore, resin ducts often appear in
tangential rows, increasing resin density in the tissue. All of these
indicators made it possible to determine with precision the first year of
exposure and to estimate precisely sheet erosion rates. |
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