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Measurement of Soil CO<sub>2</sub> Efflux Using a Closed Dynamic Chamber System
채남이,김준,김동길,이도원,김래현,반지연,손요환,Chae, Nam-yi,Kim, Joon,Kim, Dong-gill,Lee, Do-won,Kim, Rae-Hyun,Ban, Ji-yeon,Son, Yo-whan Korean Society of Agricultural and Forest Meteorol 2003 한국농림기상학회지 Vol.5 No.2
토양으로부터의 $CO_2$ 방출은 생태계의 탄소 순환에 중요한 위치를 차지한다. 주요 생태계의 순 $CO_2$ 교환과 일차 생산량 등을 정확히 산출하려면 군락 $CO_2$ 플럭스와 더불어 토양 $CO_2$ 플럭스의 관측이 함께 이루어져야 한다. 본 논문에서는 닫힌 역학 챔버 시스템을 활용한 토양 이산화탄소 플럭스의 관측 방법을 간략히 검토하고, 한반도 주요 생태계에 구축된 한국 타워 플럭스 관측 지역망(KoFlux)의 거점 관측소에서 예비 관측된 결과와 서로 다른 관측 시스템간의 상호비교 결과를 보고하고자 한다. Soil $CO_2$ emission is one of the primary components in carbon balance of terrestrial ecosystems. To accurately assess their net ecosystem exchange of $CO_2$ and net primary production, measurement of soil $CO_2$ efflux is required along with that of canopy $CO_2$ flux. In this paper, soil $CO_2$ flux measurement technique using closed dynamic chamber systems is briefly reviewed. Preliminary results on soil $CO_2$ exchange and inter-comparison of different measurement systems currently used in Korean regional network of tower flux measurement sites (KoFlux) are also reported.
생화학 및 생물리 모수들의 도출과 생권 모형(SiB2)에의 적용 : SiB2
채남이,김준 한국농림기상학회 1999 한국농림기상학회지 Vol.1 No.1
Vegetation canopy play s an important role in CO_2/H_2O ex change between the biosphere and the atmosphere by controlling leaf stomata. In this study, rice (Oryza sativa L.), a staple crop in Asia was investigated to formulate its single leaf model of photosynthesis and stomatal conductance. Photosynthesis and stomatal conductance were measured with a portable infrared gas analyzer system. Other plant and meteorological variables were also measured. To evaluate empirical constants in this biochemical leaf model, nonlinear least squares technique was used. The maximum catalytic activity of enzyme and the maximum rate of electron transport were 100 μ mol m^-2 s^-1 and 140 μ mol m^-2 s^-1 (@ 35℃), respectively. The empirical constants, m and b, associated with stomatal conductance model were 9.7 and 0.06 mol m^-2 s^-1, respectively. On a leaf scale, agreements between the modeled and the measured values of photosynthesis and stomatal conductance were on average within 20%, and the simulation of diurnal variation was also satisfactory On a canopy scale, the Simple Biosphere model (SiB2) was tested using the derived parameters. The modeled energy fluxes were compared against the micrometeorologically measured fluxes over a rice canopy. Agreements between the modeled and the measured values of net radiation, sensible heat and latent heat fluxes, and CO_2 flux (i.e., net canopy photosynthesis) were on average within 25%.
채남이 한국식물학회 2011 Journal of Plant Biology Vol.54 No.2
The consequence of changing pattern of precipitation on soil CO_2 emission is poorly understood in montane forest ecosystems under monsoon climate in Asia. In this paper, the results of 3-year field measurements are reported on the annual soil respiration (R_s) from a temperate deciduous broad-leaved forest (Quercus serrata and Carpinus laxiflora)in Korea, and its interannual variations are examined associated with changing precipitation. Based on biweekly chamber measurements from 2001 to 2004, the annual soil CO_2 emission averaged to be 7.8 t C ha^−1 with an annual variability of ∼20%. The soil temperature explained 22–97%of seasonal variations of Rs each year whereas the water-filled porosity (WFP) and precipitation pattern had a major effect on the observed interannual variation. The optimum values of WFP during the main growing season depended not only on the amount but also on the intensity and frequency of precipitation. These results indicate that the changes in catchment hydrology can significantly alter the carbon sink/source strength of forest ecosystems in monsoon Asia.
폐회로 역학 챔버 시스템을 이용한 토양 이산화탄소 플럭스 관측
채남이,김준,김동길,이도원,김래현,반지연,손요환 한국농림기상학회 2003 한국농림기상학회지 Vol.5 No.2
Soil CO2 emission is one of the primary components in carbon balance of terrestrial ecosystems. Toaccurately assess their net ecosystem exchange of CO2 and net primary production, measurement of soilCO2 eflux is required along with that of canopy CO2 flux. In this paper, soil CO2 flux measurementtechnique using closed dynamic chamber systems is briefly reviewed. Preliminary results on soil CO2exchange and inter-comparison of diferent measurement systems currently used in Korean regionalnetwork of tower flux measurement sites (KoFlux) are also reported.