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韓國産의 竹類에 關한 硏究 (第5報)

Studies on the Bamboo in Korea Part 5

한국식물학회지 1962년 5권 2호 p.13 ~ 16
정현배,
소속 상세정보
정현배 (  ) - 춘천농과대학

Abstract


CHONG, Hyon Pae (Chonchun Agricultural Coll.) Studies on the Bamboo in Korea. Part 5. A trial method of judging the age of Phyllotachys reticulata. Kor. Jour. Bot. V(2): 13-16. 1962.
Without annual ring, the bamboo can not measured by ordinary mensuration method. Other methods yet tried failed to prove the reliability. That means, as often pointed out, that the bamboo lumbering (including forest management) is not free from being precarious. Noting the fact, this author performed a series of comparative observations on a group of bamboos in different stages of growth in order to find out if there is any surer mensurability. A conclusion has been reached that the external feature of joints of branch has close connection with the age of bamboo, that the joints of the third major branch counting from the ground have, as shown in the first table, the most probability, its mean being 94.3 per cent, and that those in ages of 3 to 5 have the probability of 100 per cent, showing the far greater accuracy as compared with those in older ages.
The above conclusion needs to be adjusted with the following findings;
1) When observed disregarding the joint-tongue(the remainder of the preceeding year´s sheath), the major branches show no better probability than the minor ones. 54 to 78 per cent of them shows no difference between them. Prebability is averaged by 60 per cent.
2) When in spring the old sheaths drop away from the joints, the new ones sprout out in their places and consequently the joints present an appearance of a kind of joint-ring. But since this joint-ring does not always exactly represent the plant age, some other method muat be sought after to count the age. This author noticed what is called "joint-tongue" the tongue-like part of triangle shape which remains at the base of the sheath of the fallen leaf.
A fact was ascertained that when the number of the joint-ring coincides with that of the remaining joint-tongue, it exactly indicates the age of the plant.

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