| Autor: |
Hennon, P. E., DeMars, D. J. |
| Předmět: |
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| Zdroj: |
Canadian Journal of Forest Research. Dec1997, Vol. 27 Issue 12, p1971. 0p. |
| Abstrakt: |
Sixty-eight western hemlock (Tsuga heterophylla (Raf.) Sarg.) and 51Sitka spruce (Picea sitchensis (Bong.) Carriere) trees with bole wounds were selected from six locations in southeast Alaska. Each tree was dissected and measured for extent of internal stain and decay to determine wood volume losses over time caused by fungi. The margins ofstain and decay associated with bole injuries that ranged from 1 to 80 years old were marked on the surface of 30 cm long bole segments of each tree and then photographed. Areas occupied by stain and decay were measured for each bole segment using AutoCAD digitizing techniques and then the amount of affected volume was computed for each tree.In regression models, original sear width, original scar area, and atransformation of scar age are significantly correlated with the ln(volume of stain + decay) for hemlock, original scar length and a transformation of original sear width are significantly correlated with volume of stain + decay for spruce. Decay extended less than 1 m abovewounds and consumed less than 5% of gross tree volume in all but a few trees which had large, old scars. Decay development in hemlock wasless extensive than reported in Oregon and Washington; models from these areas greatly overestimate decay in wounded trees in southeast Alaska. Tangential callus growth (one side of the wound) was 2.1 and 1.7 mm/year for spruce and hemlock, respectively. Forest managers may use this information to design stands with acceptable heart rot levels by predicting the development of decay in wounds and by altering schedules of stand thinning and final harvest of wounded trees. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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