호남지방에 적합한 우량조림 수종의 선발에 관한연구 = A study on the selsction of the high quality trees appropriate for the forestation in Honam Area

다국어 초록 (Multilingual Abstract)

In order to select the superior race of red pine, some characteristics of individual trees of the three natural population selected from Byonsan area (lower inland parts of Byonsan, higher inland parts of Byonsan, seaside outland of Byonsan) were analyzed and compared with already reported superior population (Chuwang-san, An-Myeon-do, Odea-san). The study also investigated the variation of the wood quality of red pine in Byonsan area. The results obtained are summerized as follows;
1. The seed weight in the three natural populations selected from Byonsan area renged from 6.00g to 11.10g. The weight of seeds from the lower inland parts of Byonsan were the heaviest with an average value of 8.64g.
2. According to the classification based on the straightness of the stem, over 70% of all the natural red pine in Byonsan area were classified as A grade. The trees in the lower inland part showed the highest value in A-grade gopulation with a value over 80%.
3. There was no significant statistical differences among three natural red pine populations selected from Byonsan area, in the clear-length, seed length, seed width, seed weight and serration density.
4. As the above results, the natural red pine population of the lower inland parts of Byonsan, among three natural populations were defined by the superior individual trees.
5. The variation of the moisture content at D.B.H. was increased with an annual ring from the pith and the moisture content with height was increased as the measured point became higher.
6. The specific gravity with annual ring at D.B.H. ascended rapidly from pith to the 7th annual ring. From the 8th annual ring to the bark there was no variation. The specific gravity with its height decreased at the measured point became heighter and the average specific gravity based green wood in Bonsan area was 0.9±0.018.
7. The average shrindage of red pine in Byonsan area showed that the tangential direction was 5.62±0.794% the radial direction was 2.98±0.611% and the longitudinal direction was 0.30±0.96%. The ratio of the shirinkage compared with the tangential, radial and the longitudinal direction was 18.7:9.9:1. The tangential dirction shirinkage was shown 1.89 times more than the radial direction shirinkage. We knew it is comprehensible that in each section the shirinkage in the sap wood was larger than the shirinkage of the heart wood and variation of shirindage with height showed a decrease from the butt end to the top in the radial, tangential and longitudinal direction respectively.
8. We suppose that the tracheid length of the early wood at D.B.H. has no differences among the east, west, south and north directions and became longer while along with annual ring from the pith to the 20th annual ring, but there was no variation from the 20th annual ring to the bark. The variation of tracheid length with height showed sharp rising from the butt end to the point of 3.2m, but showed a decrease gradually from the point of 4.2m to the top of the tree. The average tracheid length of the early wood as 3.05±0.251mm.