TAILIEUCHUNG - Báo cáo khoa học: "Growth and root and morphology of planted naturally-regenerated Douglas fir and Lodgepole pine"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Growth and root and morphology of planted naturally-regenerated Douglas fir and Lodgepole pine. | Ann Sci For 1993 50 71 -77 Elsevier INRA 71 Original article Growth and root morphology of planted and naturally-regenerated Douglas fir and Lodgepole pine MR Halter CP Chanway Department of Forest Sciences University of British Columbia Vancouver British Columbia Canada V6T 1Z4 Received 18 May 1992 accepted 28 August 1992 Summary Root system morphology and growth of Douglas fir Pseudotsuga menziesii var glauca Beissn Franco and Lodgepole pine Pinus contorta var latifolia Engelm saplings transplanted from containers to the field in 1979 were compared with naturally-regenerated saplings of the same species and age. Naturally-regenerated saplings of both species were significantly taller than planted trees had greater leader growth in the previous year and height diameter ratios and smaller taproot diameters 10 cm below groundline. Naturally-regenerated saplings also had up to the number of lateral roots compared with planted saplings. Seventy to 79 of all primary lateral roots of naturally-regenerated saplings occurred within the top 10 cm of the soil surface compared with 3042 for the planted trees. The depth of the first structural lateral root associated with naturallyregenerated saplings was also significantly less than that of planted saplings. The shape of the container in which seedlings were raised in the nursery was clearly evident when root system architecture of planted saplings was examined. Many container-initiated seedling root systems exhibited conical shaping with little lateral root egress. A variety of root deformities which included constriction coiling and kinkiness were detected in planted but not naturally-regenerated saplings. These results are discussed in relation to potential difficulties arising from artificial forest regeneration with pine and Douglas fir. Pseudotsuga menziesii var glauca Beissn Franco Pinus contorta var latifolia Engelm containerization I natural regeneration root morphology Resume Croissance et morphologic des

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