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- 저자 : 노남진 (검색결과 79 건)
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노남진,손요환,조우용,이경,박찬우,한새롬 한국산림과학회 2012 Forest Science And Technology Vol.8 No.1
The minirhizotron technique was used to investigate the spatial (soil depth) and temporal (season) changes of fine roots (≤2 mm) in a mature Pinus densiflora forest. Length, production, and mortality of fine roots were measured at different depths on seven dates between March and October 2011. Average fine root length (mm cm^-2), production,and mortality (mm cm^-2) during the growing seasons were 2.54 ± 0.82, 84 ± 27, and 7 ± 4 at 0–20 cm depth,0.85 ± 0.37, 39 ± 13, and 14 ± 9 at 20–40 cm depth, and 1.26 ± 0.92, 45 ± 28, and 34 ± 16 at 40–60 cm depth,respectively. There was no significant difference in length, production, or mortality of fine roots among the different seasons and depths (P > 0.05). The seasonal pattern in fine root length generally increased during the growing seasons. The fine root production was high in summer, whereas the mortality was high in autumn. This preliminary result using a minirhizotron technique can be used for quantifying and understanding the fine root dynamics in P. densiflora forests.
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노남진,손요환,서경원,김래현,구진우,반지연,김정규 한국생태학회 2006 Journal of Ecology and Environment Vol.29 No.2
Rot nodule biomass, and seedling biomass and growth were examined for 2-year-old Robiniapseudoacacia and Amorpha fruticosa seedlings following fertilization treatments. Organic fertilizer, solid com-bination fertilizer, and organic fertilizer plus solid combbiomass (g/plant) ranged from 3.00 to 7.06 for R. pseudoacacia and varied from 1.52 to 2.32 for A. fruticosa, respectively. In all treatments, root nodule biomass of R. pseudoacacia was significantly higher than those of A. fruticosa. Fertilization significantly increased root nodule biomass for only R. pseudoacacia, however, there were no significant differences in root nodule biomass among fertilization treatments. Root nodule biomass was not influenced by soil nitrogen (N) and phosphorous (P) concentrations following fertilization treatments. Seedling biomass (components and total) and growth (diameter at root collar and height) were strongly correlated with root nodule biomass for the two N fixing tree species.
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Preliminary study on measurement of intact root respiration of Pinus densiflora seedlings
노남진,손요환,배상원,이나연,조우용,손정아 한국산림과학회 2011 Forest Science And Technology Vol.7 No.2
A laboratory study was conducted to measure the intact root respiration (RA) of Pinus densiflora seedlings in May 2010. To investigate the contribution of RA to total soil respiration (RS) and the temporal pattern of intact RA, closed and open-flow root chamber systems were used. The RA of 3-year-old P. densiflora seedlings was 9.83 nmol CO2 g71 s71. The RA to RS ranged from 53 to 58%. The intact RA was strongly temperature-dependent (P 5 0.001). Continuous measurement using an open-flow chamber system can be useful in minimizing the disturbance of root systems as a short-term measurement. This preliminary study can be applicable to field measurements for the quantification of annual RA in a P. densiflora stand.
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노남진,손요환,이수경,조우용,이나연,배상원,김현섭 한국산림과학회 2010 Forest Science And Technology Vol.6 No.1
This study was conducted to investigate the diurnal pattern of soil CO₂ efflux (RS) using an open-flow, closed-chamber system for a 70- to 80-year-old Pinus densiflora forest in the Gwangneung Experimental Forest in central Korea. The daily mean RS rate (g CO₂ m−² h−¹) was 0.486 in September, 0.073 in April, and 0.169 in May 2010. Although RS exhibited a diurnal pattern that was similar to the soil temperature pattern, the pattern varied seasonally. The Q10 value was 4.57 and 4.26 for day and night time, respectively. The annual RS rate was estimated as 6.16 t C ha−¹ y−¹ by the relationships between RS and soil temperature using continuous measurements, but as 6.73 t C ha−¹ y−¹ by using the 11:00 h mid-morning point measurements. Our study results demonstrate the necessity of measuring the diurnal pattern of RS throughout the whole year in order to obtain an accurate estimate of annual RS using an open-flow, closed-chamber system.
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