Simulation Study of Size-structure Dynamics with Changing Spatial Pattern of Tree Sizes in a Lattice-planted Japanese Cedar (Cryptomeria japonica D. Don) Plantation

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概要

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• In coniferous plantation forests, a detailed understanding of the temporal and spatial dynamics of tree sizes is important for designing silvicultural treatments as well as controlling stand productivity. However, previous investigations have yielded unclear results regarding size dynamics, especially those of coefficient of variation (CV) in diameter at breast height (DBH) soon after canopy closure. We evaluated how differences in the spatial pattern of tree sizes at canopy closure affected the subsequent size structure dynamics of a monoclonal Japanese cedar (Cryptomeria japonica) plantation using an individual competition-based model. In the model, local competition among adjacent trees determined tree growth. The model was parameterized using empirical equations derived from a 12-year-old monoclonal C. japonica plantation. We varied the spatial pattern of tree sizes while the size frequency distribution at canopy closure was fixed. Three types of initial spatial patterns were compared, where large and small trees were aggregated (large adjacent to small), random or segregated. The variation in spatial pattern of tree sizes at canopy closure resulted in differences in the dynamics of CV of DBH among stands. Our results suggested that, even in plantation forests with the same size structure and lattice planting design, different spatial patterns of tree sizes might lead to different CV dynamics in DBH. The variable size dynamics observed in previous studies may have been caused by variation in spatial pattern or short observation period. Interactions between spatial pattern of tree sizes and other factors affecting CV dynamics must be verified through long-term studies in actual plantation forests.

• 森林計画学会の論文

著者

• GYOKUSEN Koichiro

  Department of Forest and Forest Products Sciences, Faculty of Agriculture, Kyushu University

• Gyokusen Koichiro

  Department Of Forest And Forest Products Sciences Faculty Of Agriculture Kyushu University

• Gyokusen Koichiro

  Faculty Of Agriculture Graduated School Kyushu University

• MITSUDA Yasushi

  Resource Analysis Laboratory, Forestry and Forest Products Research Institute

• Inoue Sumihiro

  Faculty Of Agriculture Graduated School Kyushu University

• Mitsuda Yasushi

  Resource Analysis Laboratory Forestry And Forest Products Research Institute

• Inoue Sumihiro

  Technical Res. Inst. Hitachi Zosen Corp.

• Ishii Hiroaki

  Graduate School Of Agricultural Science Kobe University

• Shirota Tetsuoh

  Laboratory Of Silviculture Department Of Agriculture Hokkaido University

• Ishii Hiroaki

  Kobe Univ. Kobe Jpn

• Ishii Hiroaki

  Laboratory Of Forest Resources Graduate School Of Agricultural Science Kobe University

• Inoue Sumihiro

  Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University

• Shirota Tetsuoh

  Laboratory Of Silviculture Faculty Of Agriculture Shinshu University

• ISHII Hiroaki

  Graduate School of Agricultural Science, Kobe University

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