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A Study on Growth Performances of Norway Spruce(Picea abies(L .) Karst .) in Korea
Lee, Kab Yeon,Hong, Sung Gak 한국임학회 1989 한국산림과학회지 Vol.78 No.1
This study was carried out in order to evaluate the prospect of Norway spruce (Picea abies (L.) Karst.) as an economic forest tree species in Korea. The growth performances of Norway spruce introduced from Germany grown at four locations in southern part of Korea were investigated. But, unfortunately, seed sources of the species are not known in detail. The results obtained are as follows ; 1. The growth of Norway spruce at the age of 45 in Korea was fairly good compared to that of native fir(Abies holophylla Max.) which is known as fast growing conifer in Korea. As an average Norway spruce outgrew native Abies holaphylla 30 to 82 percents in volume growth. But, the growth of Norway spruce was significantly different in various micro sites even at the same plantation. 2. Growth performance was correlated with climate and site conditions of the plantations. .Among the site conditions, slope, sand and clay contents in soil, and annual mean temperature or mean temperature of March to October were negatively correlated with volume growth, while altitude, relative humidity, organic matter contents, total nitrogen contents, available phosphorus correlated with volume growth. 3. It is suggested that Norway spruce will grow well, particularly, in humid site or valley of high mountains in Korea. 4. The juvenile-mature correlation coefficients are calculated from the stem analysis data. A11 possible correlation coefficients were obtained between the 5-year age class and corresponding growth increment of diameter, height, and volume of Norway spruce. The correlation coefficients between age classes and diameter growth were 0.15 and to 0.19 between age classes and volume growth were 0.01 to 0.99 on age classes depending and in general the values are lower those than values concerned with height growth. Estimated correlation coefficients of height growth was 0.51 between age 5 and 45, and 0.63 between age 10 and 45.
Lee, Phil-Ho,Shim, Sang-Chul,Kim, Sung-Gak Korean Chemical Society 1986 Bulletin of the Korean Chemical Society Vol.7 No.6
A new heterocuprate containing 2-pyridyloxy ligand, lithium 2-pyridyloxy-n-butylcuprate, has shown improved thermal stability and it reacts with acid chlorides to afford the corresponding ketones in high yields. Similarly, it can be effectively utilized in conjugate addition reactions of $\alpha,\beta$-unsaturated ketones. Of synthetic significance is that the complete utilization of n-butyl group in lithium 2-pyridyloxy-n-butylcuprate has been observed.
SEARCH FOR PHOTOMETRIC ABUNDANCE INDICES FOR M DWARF STARS
Lee, Sang-Gak The Korean Astronomical Society 1982 Journal of The Korean Astronomical Society Vol.15 No.2
The UBVRIHKL magnitudes on Johnson system and space motions of M dwarf stars have been collected. This sample of M stars have been distinguished on a purely kinematical basis; the one with e<0.15, young disk population, with 0.15<e<0.3 old disk population, and with e>0.3 halo population. On the color-color diagrams and the color excess-orbital eccentricity diagrams, there is no distinction between the old disk stars and the young disk stars. However (I-H) color could be used to distinguish halo stars from young and old disk stars and the color excesses, ${\Delta}(U-B),\;{\Delta}(B-V),\;{\Delta}(V-R),\;{\Delta}(H-K),\;{\Delta}(K-L),\;and\;{\Delta}(B-R)$ can be used as abundance indicators only for the halo stars. But these color excesses which are measures of blue excesses, are positive for the halo stars with smaller eccentricities and become negative for those with larger eccentricities.
THE FAINT END OF THE DISK LUMINOSITY FUNCTION
Lee, Sang-Gak,Hyun, Jong-June,Yu, Yong-Sun The Korean Astronomical Society 1989 Journal of The Korean Astronomical Society Vol.22 No.2
We have analysed the proper motion data of LHS catalog, to derive the faint end of the luminosity function more precise than ever before, by mean absolute method, and by making use of the reudced proper motion diagram. It is found that the relations between the mean absolute magnitude and the reduced proper motion for main sequence stars, subdwarfs, and white dwarfs are so different that the proper application of an appropriate relation to each group is much more important. The derived luminosity function shows the broad maximum peak from $M_B{\sim}14$ to $M_B{\sim}17$ and declines after $M_B{\sim}17$ up to $M_B{\sim}22$.
LOCAL MASS DENSITY OF HALO STARS
Lee, Sang-Gak The Korean Astronomical Society 1985 Journal of The Korean Astronomical Society Vol.18 No.2
From the kinematically unbiased sample of halo stars, the local mass density of halo dwarfs is estimated as $6.0{\sim}6.3{\times}10^{-4}m_{\odot}/pc^3$ by adopting a color-magnitude relation and a mass-luminosity relation. The derived halo mass density is not much different from the results of previous studies, which were derived from the kinematically biased sample of halo stars. Therefore it is confirmed that the local mass density of halo stars is far less than that required by Ostriker-Peebles to stabilize the galactic disk against barlike instabilities.
THE PROBLEMS IN THE USUAL METHOD OF CLASSIFICATION FOR METAL POOR STARS
Lee, Sang-Gak The Korean Astronomical Society 1988 Journal of The Korean Astronomical Society Vol.21 No.2
The usual method of classification for metal poor stars is based on the normal standard stars. In this study, we show that among the sample of stars classified by this method, a systematic bias in the observed classes of metal weakness is found and, also that this method is not appropriate for classification of metal poor stars, by showing that the spectral line dependences on the temperature and pressure in the extreme metal poor stars are different from those in the normal standard stars. Therefore, we suggest that the 3-dimensional classification system, like 2-dimensional MK system, is necessary for an accurate classification of metal poor stars.
A STUDY ON ABUNDANCE INDICATOR FOR LATE TYPE DWARFS
Lee, Sang-Gak The Korean Astronomical Society 1983 Journal of The Korean Astronomical Society Vol.16 No.2
From UBVRI photometry and space motion data of 232 late type dwarf stars, it is found that for the stars of (R-I)<0.5, $\Delta$(U-B) and $\Delta$(B-V) color excesses are correlated with their orbital eccentricities. Therefore, $\Delta$(U-B) and $\Delta$(B-V) color excesses can be used as possible photometric abundance indicators for the stars of (R-I)<0.5. For the stars of (R-I)${\geq}$0.5, the correlation between color excess and orbital eccentricity is not clear. However, it is interesting to note that the high orbital eccentricity stars show some blue deficiencies and these blue deficiencies seem to be correlated with orbital eccentricity.