Branches and the assimilatory apparatus of full-grown trees of Douglas fir (Pseudotsuga menziesii /Mirb./ Franco) of a different coenotic position
2007
Martiník, A., Mendel University of Agriculture and Forestry in Brno (Czech Republic). Faculty of Forestry and Wood Technology. Department of Forest Establishment and Silviculture | Kantor, P., Mendel University of Agriculture and Forestry in Brno (Czech Republic). Faculty of Forestry and Wood Technology. Department of Forest Establishment and Silviculture
The paper deals with problems of crowns and of the assimilatory apparatus of Douglas fir. Crowns of two trees aged about 70 years of different coenotic (dominant-subdominant) and production (volume: minimum-maximum) position in a stand were analysed. The trees came from the experimental stand 41D7, Training Forest Enterprise Masaryk Forest Křtiny (altitude 430 m). Differences between Sample tree 1 (subdominant tree - V = 0.44 cubic m) and Sample tree 2 (dominant tree - V = 2.37 cubic m) were found in the course of the analysis of height and diameter increment. Sample tree 1 was characterized not only by a shorter crown, both absolutely and relatively (in % of the stem length) but also shorter whorl branches and their lower number. While the crown of Sample tree 1 was created by 28 whorls with 3.5 branches/whorl, Sample tree 2 was created by 37 whorls and 4.5 branches/whorl. A different course was also found in case of needle distribution (g per m). A unimodal curve was typical of the dominant tree while the subdominant tree was characterized by an irregular multi-peak curve. Throughout the crown profile, Sample tree 1 showed higher values of foliage index (the proportion of needle DM to skeleton DM) than Sample tree 2. The total biomass of needles in Sample tree 1 and Sample tree 2 was 10.55 and 68.2 kg, respectively. Leaf area index (LAI) in Sample tree 1 amounted to 4.90 square m per square m and that in Sample tree 2 5.26 square m per square m.
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