Diurnal Pattern of Soil CO₂ Efflux in a Pinus densiflora Forest Measured Using an Open-flow Chamber System

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.

중부지방 상수리나무의 바이오매스 연구

노남진,손요환,김래현,서경원,구진우,손영모,이경학 한국임학회 2006 한국임학회 정기학술발표논문집 Vol.2006 No.-

소나무 묘목의 미분리 뿌리호흡 측정 예비연구

노남진,손요환,조우용,이나연,배상원 한국임학회 2011 산림과학 공동학술대회 논문집 Vol.2011 No.-

실외 인위적 온난화가 굴참나무 묘목의 토양호흡에 미치는 영향

노남진,손요환,정혜근,조우용,한새롬,이선정,윤태경 한국임학회 2012 산림과학 공동학술대회 논문집 Vol.2012 No.-

에너지다소비업종 자급도가 산업부문 에너지원단위에 미치는 영향

노남진,윤성민 한국산업경제학회 2023 산업경제연구 Vol.36 No.3

Along with energy conversion, energy intensity improvement is presented as an effective alternative for carbon neutrality. Changes in a country's energy intensity are affected by the energy efficiency of each industry and the overall industrial structure, and trade is a significant factor in changing the industrial structure under the global economic system. Nonetheless, the existing system for calculating energy consumption and carbon emissions, which is based on production, has limitations in capturing the effects of changes in energy intensity caused by trade. Therefore, this study examined the effects of the self-sufficiency of energy-intensive industries on energy intensity. Existing empirical analysis studies on changes in energy intensity mainly considered external openness to analyzing the impact of trade but showed limitations in proving a direct causal relationship. Therefore, this study assumed the composition of trade items as a factor in the change in energy intensity and utilized the self-sufficiency of energy-intensive industries as a variable to reflect the impact. In addition, to prevent bias due to omitted variables that might affect energy intensity, like R&D spending, energy price index, and urbanization rate, which can reflect technology improvement and savings, were included as explanatory variables. The analysis used fully-modified OLS (FMOLS) and dynamic least squares (DOLS), which are dynamic panel models using cointegration relationships. As a result of the analysis, this study confirmed that an increase in self-sufficiency in energy-intensive industries causes an increase in energy intensity, and a decrease in self-sufficiency causes a decrease in energy intensity. In addition, this study confirmed that the increase in energy price and urbanization rate causes a decrease in energy intensity. On the other hand, expenditure on R&D did not have a significant effect, which is inferred because the investment was not limited to the energy efficiency field. 에너지 전환과 더불어 에너지원단위의 개선은 탄소중립을 위한 주요 대안으로 제시된다. 한 국가의 에너지원단위 변화는 각 산업의 에너지효율뿐만 아니라 전체 산업구조의 영향을 받게 되며 글로벌 경제 체제 하 교역은 산업구조를 변화시키는 주요 요인이 된다. 그러나 현행 생산기반 에너지소비량 및 탄소 배출량 산정 체계는 교역으로 인한 에너지원단위 변화 영향을 밝히는 데 한계를 보인다. 이에 본 연구는 교역으로 인한 에너지원단위 변화 영향을 실증분석을 통해 검토하였다. 기존의 에너지원단위 변화에 관한 실증분석 연구들은 국가 간 교역의 영향을 분석하기 위해 대외개방도를 주로 고려하였으나 일관된 방향성을 보이지 못하며 직접적 인과관계를 규명하는 것에 어려움이 있었다. 이에 본 연구는 교역 품목의 구성을 에너지원단위 변화의 요인으로 가정하고 그 영향을 반영하기 위해 에너지다소비업종의 자급도를 설명변수로 활용하였다. 또한 에너지원단위에 변화에 영향을 미치는 중요 변수의 누락으로 인한 편의를 줄이기 위해 기술 개선과 절약을 반영할 수 있는 R&D 분야의 지출액 및 에너지 가격지수, 도시화율을 설명변수에 포함하였다. 분석모형은 공적분 관계를 활용한 동적 패널모형인 완전수정최소제곱법(FMOLS, fully-modified OLS) 및 동적최소제곱법(DOLS, dynamic OLS)을 이용하여 추정하였다. 분석 결과, 에너지다소비업종의 자급도 증가(또는 순수출 증가)는 에너지원단위 상승을 유발하고, 자급도 감소(또는 순수출 감소)는 에너지원단위 하락을 유발함을 확인하였다. 또한 에너지 가격 및 도시화율의 상승은 에너지원단위를 감소시키는 것을 확인하였다. 한편, R&D 분야에 대한 지출은 유의한 영향을 미치지 못하였는데, 이는 에너지효율 분야에 한정된 특성을 반영하지 못하기 때문으로 추론된다.

Preliminary study on estimating fine root growth in a natural Pinus densiflora forest using a minirhizotron technique

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.

아까시나무와 족제비싸리의 뿌리혹 건중량과 묘목 생장과의 관계에 관한 연구

노남진,손요환,서경원,김래현,구진우 한국임학회 2006 한국임학회 정기학술발표논문집 Vol.2006 No.-

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.

Root Nodule Biomass of Robinia pseudoacacia and Amorpha fruticosa Seedlings with Fertilization Treatments

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.

낙엽송과 리기다소나무 벌채지에 조성된 낙엽송 임분의 11년간 토양 물리⋅화학적 특성 변화

노남진,한승현,이상태,조민석 한국산림과학회 2023 한국산림과학회지 Vol.112 No.4

This study was conducted to understand the long-term changes in soil physiochemical properties and seedling growth in Larix kaempferi (larch) stands planted in clear-cut larch and Pinus rigida (pine) forest soils over an 11-year period after reforestation. Two-year-old bare-root larch seedlings were planted in 2009-2010 at a density of 3,000 seedlings ha-1 in clear-cut areas that harvested larch (Chuncheon and Gimcheon) and pine (Wonju and Gapyeong) stands. We analyzed the physiochemical properties of the mineral soils sampled at 0-20 cm soil depths in the planting year, and the 3rd, 7thand 11th years after planting, and we measured seedling height and root collar diameter in those years. We found significant differences in soil silt and clay content, total carbon and nitrogen concentration, available phosphorus, and cation exchangeable capacity between the two stands; however, seedling growth did not differ. The mineral soil was more fertile in Gimcheon than in the other plantations, while early seedling growth was greatest in Gapyeong. The seedling height and diameter at 11 years after planting were largest in Wonju (1,028 tree ha-1) and Chuncheon (1,359 tree ha-1) due to decreases in stand density after tending the young trees. The soil properties in all plantations were similar 11 years after larch planting. In particular, the high sand content and high available phosphorus levels (caused by soil disturbance during clear-cutting and planting) showed marked decreases, potentially due to soil organic matter input and nutrient uptake, respectively. Thus, early reforestation after clear-cutting could limit nutrient leaching and contribute to soil stabilization. These results provide useful infor- mation for nutrient management of larch plantations.