匹見演習林における天然スギの研究(I) : 匹見地方 天然スギ林における葉形の変異について

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We studied the variation of genetic characters of some natural forests of SUGI(Cryptomeria japonica) in the western Shimane Pref. ranging from east to west over 100 km. on the Chugoku Mts.
Supposing the usefulness of the leaf from as an indicator of the genetic characters of SUGI, we measureed the inner angle between leaf and twig, the leaf length, the leaf curvature and the leaf slenderness of many sample twigs collected one at a tree from the following forests, in the fall of 1960 :
1. KUMoTOOSHI, (clone, 3 even-aged artificial stands.)
2. YABUKUGURI, URASEBARU and AYA, (clone complex, even-aged artificial stand.)
3. K-36, (even-aged artificial stand of seed tree K-36's offsprings,)
4. YOSHINO, (3 even-aged artificial stands in Yoshino district, Nara Pref.)
5. Natural SUGI forests in Shimane Pref.
SANBE, (eastern part, somewhat isolated from the Chugoku Mts.)
HIKIMI, (western part)
NICHIHARA, (western part,)
Sample number of each stand is 50-270.
Results is shown in Table 1-5, Fig. 2-7.
Leaf angles showed the most suitable character for the genetic indicator. Therefore, using this character chiefly, we found that the variation of genetic character in each natural forest ranged widely and genetic characters seen in SANBE forest differed from those of HIKIMI and NICHIHARA forest. Being considered that SANBE SUGI forest has been isolated ecologically and genetically from extensive area of SUGI natural forest on the Chugoku Mts. it may be treated as a local form or a geographical race.
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