Effect of stem height,dominance class,and site quality on sapwood permeability in loblolly pine, (Pinus taeda L.) |
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| Institution: | 1. Forest Department, College of Forest and Landscape, Anhui Agricultural University, Hefei, China;2. Key Laboratory of Bamboo and Rattan Science and Technology of the State Forestry Administration, Department of Bio-materials, International Centre for Bamboo and Rattan, Beijing 100102, China;3. Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Shandong 266101, China;1. Irstea, UR EFNO, Domaine des Barres, F-45290 Nogent-sur-Vernisson, France;2. Univ. Grenoble Alpes, Irstea, UR LESSEM, Centre de Grenoble, F-38402 St-Martin-d''Hères, France;1. Department of Forest Products, Faculty of Forestry and Environment, IPB University, Bogor, 16680, Indonesia;2. Université de Lorraine, INRAE, LERMAB, F-54000, Nancy, France;3. Department of Chemistry, Faculty of Mathematics and Natural Sciences, Tropical Biopharmaca Research Center IPB University, Bogor, 16680, Indonesia;4. Researcher at PERHUTANI Research and Development Centre, Cepu, 58313, Indonesia |
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| Abstract: | Sapwood permeability measurements in 30-year-old green loblolly pine (Pinus taeda L.) on the Clemson Experimental Forest in the Piedmont of South Carolina, USA demonstrated that permeability is not constant and is affected by position in the bole, distance from the pith, tree dominance class, and site. Permeability increased with increasing distance from the pith and with increasing height within the tree. Sapwood area decreased with increasing height reflecting the stem taper. Sapwood area, permeability, and conductance (permeability × sapwood area) were significantly greater on stands of higher site quality. Conductance values throughout the stem were nearly equal demonstrating how permeability and sapwood area work together to affect the trees' overall transport of water from base to crown. The significant increase in permeability and conductance associated with better sites and greater dominance class may be due to more functional tracheids in the inner sapwood. Evidently, this functional tissue enhances the trees' ability to obtain adequate nutrients and water especially on good sites. |
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