TAILIEUCHUNG - Báo cáo khoa học: "Scaling up from the individual tree to the stand level in Scots pine. I. Needle distribution, overall crown and root geometry"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Scaling up from the individual tree to the stand level in Scots pine. I. Needle distribution, overall crown and root geometry. | Ann. Sci. For. 1998 55 63-88 Inra Elsevier Paris 63 Original article Scaling up from the individual tree to the stand level in Scots pine. I. Needle distribution overall crown and root geometry Jan Cermák Francesca Riguzzi Reinhart Ceulemans University of Antwerpen UIA Department of Biology Universiteitsplein 1 B-2610 Wilrijk Belgium Received 15 January 1997 accepted 17 September 1997 Abstract - We quantified and scaled up from individual trees over average trees per diameter at breast height DBH class various characteristics of canopy architecture such as leaf area index needle aggregation vertical and radial distribution of the foliage for a mature even-aged Scots pine Pinus sylvestris L. stand in the Campine region Brasschaat Belgium. Both the vertical and radial needle distribution scaled up to the stand level from destructive harvests of a limited number of trees have been presented. Total leaf area index for the stand was derived from the needle distribution in different canopy layers. The cloud technique used to describe the position and aggregation of needles on branches on branches in the crown and on crowns in the canopy has been described and applied. These clouds are well-defined spatial units larger than clusters on branches with between one and several clouds per branch. The regression equations used to relate needle properties positions of clouds needle distribution to stand- and tree-related parameters such as diameter at breast height frequency distribution were developed parameterised for the particular stand and applied for scaling up purposes. The fitted Rayleigh equation defined the midpoint of the canopy at a height of m and the canopy depth as only being almost 5 m. The appropriate values for making conversions from needle mass to needle area were presented and discussed in relation to position in the crown. Overall crown and canopy geometry as well as geometry and dimensions of the root system were also described and scaled up from

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