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  • Eucalyptus regnans  (2)
  • Stem defect  (1)
  • eucalypt plantations  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Effects of bending stress on taper and growth of stems of youngEucalyptus regnans trees (1996)
    Springer
    Trees 10 (1996), S. 239-246 
    Details
    ISSN: 1432-2285
    Schlagwort(e): Bending stress ; Stem shape ; Radial growth rate ; Eucalyptus regnans
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract A glasshouse experiment investigated the effect of bending stress on stem radial and height growth and stem taper ofEucalyptus regnans seedlings. Eighteen-week-old, potted seedlings were bent continuously for 8 weeks with a static bending stress. The bending treatment was then removed and the seedlings grown for another 12 weeks. Other seedlings were stayed vertically throughout the experiment whilst control seedlings were neither bent nor stayed. Seedlings were rotated every 2 days to prevent reaction wood developing asymmetrically in the stems of bent trees. Bent trees had higher radial growth rates, developed more tapered stems and had higher safety factors (the ratio of stem radius to the minimum radius required to prevent the tree toppling over) than unbent seedlings. They produced a band of tension wood in their stems and ceased height growth whilst bent. When bending ceased, they resumed normal radial and height growth. Unbent trees developed more cylindrical stems. There were no differences in growth behaviour between stayed and control trees. Bent and unbent trees all developed a butt swell, the taper of which was not affected by treatment. It was concluded that bending stress has substantial effects on both the size and taper of tree stems. However, the development of butt swell is independent of the bending stress applied. The results were considered in relation to biomechanical theories of tree stem development.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02185675
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  • 2
    Digitale Medien
    Digitale Medien
    Breakage of hollow tree stems (1994)
    Springer
    Trees 9 (1994), S. 47-50 
    Details
    ISSN: 1432-2285
    Schlagwort(e): Stem defect ; Tree breakage ; Wood engineering
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract Stems of trees hollowed by agents such as fungal decay, fire or termites have reduced strength and increased likelihood of breakage. This may pose a serious hazard when hollow trees are growing near public places. Previous theoretical studies and field studies of hollow trees, of both hardwood and softwood species, in Europe and America have suggested rules to quantify the risk of breakage of hollow trees. These rules are confirmed and expanded here, using data collected from hollow trees of several species of the hardwood genus Eucalyptus in Australia. It is concluded that where the ratio of the minimum wall thickness of a stem hollow to the total radius of the hollow exceeds 0.3–0.35 and at least one-half of the girth of the tree stem is intact, it is extremely unlikely that the stem of the hollow tree will break. These rules appear to apply for a wide range of tree species throughout the world.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00197869
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  • 3
    Digitale Medien
    Digitale Medien
    Effects of bending stress on taper and growth of stems of young Eucalyptus regnans trees (1996)
    Springer
    Trees 10 (1996), S. 239-246 
    Details
    ISSN: 0931-1890
    Schlagwort(e): Key words Bending stress ; Stem shape ; Radial growth rate ; Eucalyptus regnans
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract  A glasshouse experiment investigated the effect of bending stress on stem radial and height growth and stem taper of Eucalyptus regnans seedlings. Eighteen-week-old, potted seedlings were bent continuously for 8 weeks with a static bending stress. The bending treatment was then removed and the seedlings grown for another 12 weeks. Other seedlings were stayed vertically throughout the experiment whilst control seedlings were neither bent nor stayed. Seedlings were rotated every 2 days to prevent reaction wood developing asymmetrically in the stems of bent trees. Bent trees had higher radial growth rates, developed more tapered stems and had higher safety factors (the ratio of stem radius to the minimum radius required to prevent the tree toppling over) than unbent seedlings. They produced a band of tension wood in their stems and ceased height growth whilst bent. When bending ceased, they resumed normal radial and height growth. Unbent trees developed more cylindrical stems. There were no differences in growth behaviour between stayed and control trees. Bent and unbent trees all developed a butt swell, the taper of which was not affected by treatment. It was concluded that bending stress has substantial effects on both the size and taper of tree stems. However, the development of butt swell is independent of the bending stress applied. The results were considered in relation to biomechanical theories of tree stem development.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02185675
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Effect of post-planting applications of granulated atrazine and fertiliser on the early growth of Eucalyptus nitens (1994)
    Springer
    New forests 8 (1994), S. 323-333 
    Details
    ISSN: 1573-5095
    Schlagwort(e): atrazine ; establishment ; eucalypt plantations ; nitrogen-fertiliser ; phosphorusfertiliser ; triazine herbicides ; weed control
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: Abstract A factorial experiment was established in a plantation of Eucalyptus nitens in southern Tasmania on a site which had formerly carried native eucalypt forest. Before planting, the site had been cleared of weeds with foliar translocated and pre-emergence herbicides. The first factor of the experiment examined the effects on tree growth of no post-planting weed control, control by hand or with three levels of application of granulated atrazine, 0.9, 1.8 and 8 kg ha−1. The second factor examined the effects of no fertiliser application or the application of nitrogen as urea at 200 kg ha−1 N plus triple superphosphate at 120 kg ha−1 P. Tree growth responses to treatments were examined at 11, 16, 23 and 29 months of age. Fertiliser application increased tree height and diameter growth. Application of atrazine generally reduced height and diameter growth, but this was statistically significant only at the highest rate of application. Growth reduction occurred even though atrazine reduced post-planting weed cover on the site and hence potential competition with the tree crop for site resources. Hand weeding reduced the weed crop on the site even more than atrazine, but this did not increase growth of the tree crop. Given satisfactory establishment practices which include the use of herbicides pre-planting, it was concluded that post-planting weed regeneration was not sufficiently vigorous to warrant post-planting weed control on these sites. The use of atrazine for post-planting weed control could even be deleterious to eucalypts.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00036732
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