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홍경락 ( Hong Gyeong Lag ),이석우 ( Lee Seog U ),정재민 ( Jeong Jae Min ),장경환 ( Jang Gyeong Hwan ),강범룡 ( Kang Beom Lyong ) 한국산림과학회 2004 한국산림과학회지 Vol.93 No.1
The objectives of this study were conducted to investigate the spatial genetic structure of a samll stand of Pinus delzsifloru in Anmyon island, which regenerated naturally after clearcut, and to figure out how silvicultural activities affect the genetic structure, About 50% of trees in the study area were thinned out two years ago. Forest age was estimated 27-year-old from tree cores of residuals and tree rings of stumps. Total area of the study site was about 5,000㎡. In September 2001, all 203 trees were mapped and bud samples for isozyme analysis collected within a 50m × 50m area. Tree heights ranged from 10m to 12m and the diameter of breast height averaged over 203 trees was 12.lcm (SD=0.3). Nine polymorphic isozyme loci in 6 isozymes were examined. Proportion of polymorphic loci at 95% level, average number of allele per locus, expected and observed heterozygosities were 77.8%, 2.1, 0.130, and 0.155, respectively. These values were lower than those from the study of 25 P. densiiflora natural populations. On the contrary, the fixation index of 0.161 was much higher than that of 25 natural populations (F_(1s)=-0.008). The individual trees in the study plot appeared to be closely related due to the lack of mother trees that disseminate seeds in the stand. This might be why the fixation index for the study plot was high. Results from spatial autocorrelation analysis with Moran`s index showed that trees within a diameter of 3m were genetically homogeneous. Such a small genetic patchy size observed in the present study might be caused by the differences in microenvironmental selection effects and random mortality of seeds rather than by the seed dispersal patterns. A thinning method similar to the systematic cluster sampling method was performed within the study site. So, it was likely that the thinning had a small effect on the determination of genetic patchy size in the study site. However, we could not trace the change of genetic structure and genetic patchy size before and after thinning because we did not have genetic information for the study area before thinning.
점봉산 (點鳳山) 잣나무임분의 개체목 공간분포에 따른 유전구조
홍경락(Kyung Nak Hong),권영진(Young Jin Kwon),정재민(Jae Min Chung),신창호(Chang Ho Shin),홍용표(Yong Pyo Hong),강범룡(Bum Yong Kang) 한국산림과학회 2001 한국산림과학회지 Vol.90 No.1
Genetic differentiation of populations is resulted from the environmental and the genetic effects, and the interactions between them. Whereas, the major factors influencing to the genetic differentiation within populations are the gene flow induced by seed or pollen dispersial, the microsite heterogeneity, and the density-dependent distribution of individuals. For the purpose of studying spatial genetic structure and the distribution pattern of Korean pines(Pinus koraiensis), we set up one 100 × 100㎡ plot at a Korean pine stand in Quercus mongolica community on Mt. Jumbong in Korea. To estimate the coefficient of spatial autocorrelation as Moran`s index and an analogue, simple block distance, isozyme markers were analyzed in 325 Korean pines. For 11 polymorphic loci observed in 9 enzyme systems, the average percentage of polymorphic loci, the observed and expected heterozygocity were 72.2% 0.200, and 0.251, respectively. It was revealed the excess of homozygotes was observed in the plot, which suggests that here may be more number of consanguineous trees than expected. On the basis of isozyme genotypes observed in this study, 325 trees were classified into 147 groups in which the maximum number of trees for one group was 34. From the distance class of 24-32m, the genetic heterogeneity began to increase. The variation of simple block distance against the growth performance by tree height and diameter also showed the same trend at 24-32m class. According to high fixation index(F=0.204), the spatial genetic structure within a stand, the analysis of the growth performance, and the distribution patterns of identical genotypes, we inferred that the genetic structure of a Korean pine stand in Mt. Jumbong has been maintained rather density-dependent mechanism than the gene flow, such as the pollen dispersial or the heavy input of seeds following the forest gaps. The genetic patchy size was determined between 24-32m, which suggests that the selection of individuals for the ex situ conservation of Korean pine in Mt. Jumbong may be desirable to be made with the spatial distance over 37 meters between trees.