Ecological Studies of Suzutake (Sasa borealis) (II)

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Other Title
  • スズタケの生態に関する研究(II)
  • スズタケの生態に関する研究-2-
  • スズタケ ノ セイタイ ニ カンスル ケンキュウ 2

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Abstract

Cutting tests on Sasa borealis community have been carried out in 1972, and since then they are still under investigation; in the previous paper we dealt with the growth of Sasa community for four years from 1972 to 1975. In this paper we dealt with the results of the survey covering twelve years from 1972 to 1983. The summary of the results is as follows; 1) Ten years after cutting, culm density had not reached to its former level, especialy in July cutting plot. 2) Leafless culms took a part of Sasa community but they did not foliate any more, hence it is obvious that the existence of leafless culms is detrimental to Sasa community. 3) The culm life span estimated by culm number transition were 13 years at the maximum and 4-6 years on the average. 4) Culms in all cutting plots were shorter than non cutting plot. The average culm height of Sasa community after the lapse of ten or eleven growing seasons were 60-70％ of the height before the cutting. 5) Only once a year new branches of Sasa borealis bifurcates from the old branches, but the primary branches bifurcate directly from the upper part (5-6 nodes) of culm in the current or the next year of sprouting, and thereupon we investigated the relation between culm ages and branch bifurcation order. When it is young, culm age agreed approximately with branch bifurcation order but the discrepancy between culm age and branch bifucation order increased as it grew old. Accordingly we could conclude that it is quite difficult to estimate culm age by branch bifurcation order. 6) Leaves on one culm increase with bifurcation of branches and reach to the maximum in the next year or the year next after the sprouting. 7) In July and October cutting plots, the rhizome were underdeveloped and taken to pieces. As things stand, development of rhizome were seemed to be retarded. 8) It was observed that the distribution of culms by age group was identical to the community. From the above results, it becomes clear that the effect of cutting on Sasa borealis community stretches over a long period of time.

Journal

  • 九州大学農学部演習林報告

    九州大学農学部演習林報告 54 105-123, 1984-03-26

    Research Institution of University Forests, Faculty of Agriculture, Kyushu University

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