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Estimation of Effective Population Size in a Clonal Seed Orchard of Chamaecyparis obtusa
강규석,손석규,김찬수 한국산림과학회 2007 한국산림과학회지 Vol.96 No.5
Clonal diferences in fertility (expresed as the number of female and male strobili) were determined forfive consecutive years (2002-206) in a clonal sed orchard of Chamaecyparis obtusa. Fertility variedamong clones and among years with producing five-year averages of 378.8 and 871.2 for female and malestrobili per ramet, respectively. Correlation between female and male strobilus production was positive overthe five years and statisticaly significant. Based on the observed fertility variation, the effective populationNe) were calculated and varied from 24.3 to 47.9 (48.6% to 95.8% ofcensus number, N) among the five studied years. On average (pooled), the relative effective population sizewas 82% of the N. Variation in female fertility was higher than that in male fertility, and this variation wasreflected on female and male parents’ status numbers. Poled Ne estimated from the five years was higherthan that from poor sed production years. From our results, it was concluded that genetic diversity
인도의 채종림 2개 집단에서 년도별 개화량 변이와 이의 유효집단크기에 대한 영향
강규석,박지민,( R. Kamalakannan ),( M. Varghese ) 한국임학회 2014 산림과학 공동학술대회 논문집 Vol.2014 No.-
Seed is the most commonly used reproductive forest material. There are three practical ways of improving the genetic quality and productivity of forests: 1) by using seeds from appropriate provenances or good trees; 2) by collecting seeds from registered seed stands; 3) by supplying genetically improved seeds collected from seed orchards. A seed production area is defined as a plus stand that is upgraded and opened by removal of undesirable individuals and then cultured for early and abundant seed production. The seed stand provides a useful interim measure to obtain seed of improved genetic quality until more intensively selected material is available from seed orchards. Seeds collected from registered seed stands give some level of genetic improvement including adaptability, vigor and tree form, through eliminating poor genotypes and seed collection from vigorous trees. We investigated the amount of flowering of two tropical tree species in India. There was a large variation of growth and flowering characteristics among individual trees in seed stands of Tamarindus indica and Azadirachta indica in southern India. The percentage of fertile trees was higher in 2007 than in 2006. The good male flowering individuals also showed good female fruit production. Highly significant correlations among growth characters, male flowering and fruit production were found for both species. There was a great deviation of parental contribution from expectation; 20% of individuals contributed about 70% male flower and female fruit production in both species. Femaleness index showed that contribution between female and male in the good flowering year was more balanced, compared to the poor flowering year. The coefficients of variations of male flower and female fruit production were higher at the poor flowering year than at the good one. This was coupled with the fertility variation among individuals and the effective number of parent. In T. indica, the contribution of female parent was close to more equal than that of male parent. In A. india, however, the female fertility variation was larger than the male fertility variation among individuals. The relative effective numbers of male and female parents were low under the two consecutive years. When combined both male and female fertility variation, the relative effective number of parent was increased. The management option of equal seed harvest among individuals gave the improvement of fertility variation and thus increased the effective number of parent, compared with harvesting all seeds.