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- 저자 : 장경환(Kyong Hwan Chang) (검색결과 1 건)
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한상억(Sang Urk Han),최완용(Wan Yong Choi),장경환(Kyong Hwan Chang),김태수(Tae Su Kim),송정호(Jeong Ho Song) 한국산림과학회 2001 한국산림과학회지 Vol.90 No.6
This study was conducted in an attempt to quantify some traits that may be involved in the reproductive process of Pinus thunbergii. During the past 6 years (1995-2000), we surveyed flowering patterns of 60 P. thunbergii clones in a seed orchard which was established in Anmyon-do, 1979. From this survey, we estimated clonal contributions of male and female flowers and sexual asymmetry. Among 60 clones, 18 clones (30%) accounted for 0.37 (1999)-0.46 (1995) of clonal contribution in female flowers and 0.44 (1999)-0.57 (1995) of clonal contribution in male flowers. As compared with the previous reports in other pine species, more clones made contributions to reproductive process in P. thunbergh seed orchard. The relative effective population numbers for females (v_♀) varied from 0.59 (1995) to 0.91 (1999) and those for males (v_♀) were between 0.56 (1995) and 0.83 (1998) at gamete level. This showed that the female gametes effectively contribute to the reproductive process more than did the male gametes. The relative effective population numbers at clonal level (v_♀) were in the range of 0.72 (1995) and 0.93 (1999). More than 73% of the total clones showed values of 0.4-0.6 (0.5±0.1) in maleness index. The values averaged over all the clones were temporally variable with the range of 73% in 1996 and 100% in 2000. The degree of sexual asymmetry (A_s) ranged from 0.09 to 0.26. These values were relatively low when compared with those of other trees, suggesting that P. thunbergii seed orchard remains a high level of homogeneity in the number of male and female. All of the various types of effective population numbers were positively correlated with each other while they were negatively correlated with the degree of sexual asymmetry.
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