한국농림기상학회지, 제 5권 제2호(2003) (pISSN 1229-5671, eISSN 2288-1859)
Korean Journal of Agricultural and Forest Meteorology, Vol. 5, No. 2, (2003), pp. 70~80
ⓒ Author(s) 2014. CC Attribution 3.0 License.


2002년 여름철 경사진 광릉 낙엽 활엽수림에서의 이산화탄소 교환

최태진(1), 김준(1), 임종환(2)
1연세대학교 지구환경연구소/대기과학과, 2임업연구원 산림생태과

CO2 Exchange in Kwangneung Broadleaf Deciduous Forest
in a Hilly Terrain in the Summer of 2002

Taejin Choi(1), Joon Kim(1), Jong-Hwan Lim(2)
(1)Global Environmental Laboratory/Department of Atmospheric Sciences, Yonsei University, Seoul 120-749, Korea
(2)Division of Forest Ecology, Korea Forest Research Institute, Seoul 130-712 Korea

ABSTRACT
We report the first direct measurement of $CO_2$ 수식 이미지 flux over Kwangneung broadleaf deciduous forest, one of the tower flux sites in KoFlux network. Eddy covariance system was installed on a 30 m tower along with other meteorological instruments from June to August in 2002. Although the study site was non-ideal (with valley-like terrain), turbulence characteristics from limited wind directions (i.e., 90$\pm$ 수식 이미지45$^{\circ}$ 수식 이미지) was not significantly different from those obtained at simple, homogeneous terrains with an ideal fetch. Despite very low rate of data retrieval, preliminary results from our analysis are encouraging and worthy of further investigation. Ignoring the role of advection terms, the averaged net ecosystem exchange (NEE) of $CO_2$ 수식 이미지 ranged from -1.2 to 0.7 mg m$^{-2}$ 수식 이미지 s$^{-1}$ 수식 이미지 from June to August in 2002. The effect of weak turbulence on nocturnal NEE was examined in terms of friction velocity (u*) along with the estimation of storage term. The effect of low uf u* NEE was obvious with a threshold value of about 0.2 m s$^{-1}$ 수식 이미지 . The contribution of storage term to nocturnal NEE was insignificant; suggesting that the $CO_2$ 수식 이미지 stored within the forest canopy at night was probably removed by the drainage flow along the hilly terrain. This could be also an artifact of uncertainty in calculations of storage term based on a single-level concentration. The hyperbolic light response curves explained >80% of variation in the observed NEE, indicating that $CO_2$ 수식 이미지 exchange at the site was notably light-dependent. Such a relationship can be used effectively in filling up the missing gaps in NEE data through the season. Finally, a simple scaling analysis based on a linear flow model suggested that advection might play a significant role in NEE evaluation at this site.

Keyword: Net ecosystem exchange, CO2 flux, Forest, Eddy covariance, Hilly terrain, KoFlux

MAIN

적요

본 연구에서는 KoFlux네트워크 타워 관측소의 하나인 광릉 낙엽 활엽수림에서 최초로 직접 관측된 이산화탄소 플럭스를 보고한다. 2002년 6월부터 8월까지 에디 공분산 시스템을 다른 기상 관측 기기들과 함께 30 m 타워에 설치하였다. 관측 장소가 계곡과 같은 경사지에 위치해 있음에도 불구하고 관측된 난류 특성이, 제한된 풍향(즉, 90$\pm$ 수식 이미지45$^{\circ}$ 수식 이미지)의 경우, 평평하고 균질한 이상적인 장소에서 관측된 것들과 크게 다르지 않았다. 관측 자료 회수율은 비록 낮았으나, 분석된 예비 결과는 고무적이고, 연구해야 할 가치가 있는 것으로 나타났다. 이류 항을 무시하면, 생태계의 순 $CO_2$ 수식 이미지 교환(NEE)은 6월에서 8월까지 약 -1.2에서 0.7 mg m$^{-2}$ 수식 이미지 s$^{-1}$ 수식 이미지의 범위를 보였다. 약한 난류가 야간 NEE에 미치는 효과를 마찰 속도(u*)및 저류 항의 산출과 관련하여 살펴보았다. 낮은 u*가 NEE에 미치는 영향은 약 0.2 m s$^{-1}$ 수식 이미지의 문턱 값을 기점으로 뚜렷하게 나타났다. 야간 NEE에 미치는 저류 항의 역할은 거의 나타나지 않았는데, 이는 밤 동안 산림 내에 축적된 $CO_2$ 수식 이미지가 경사면을 따라 배수류로 빠져나갔기 때문인 것으로 사료된다. 이는 또한 저류 항을 한 높이에서만 관측된 농도 자료를 사용함으로 생긴 오차로 인한 인위적인 결과일 수도 있다. 쌍곡선 광 반응식을 적용한 결과, 관측된 NEE 변화의 80% 이상이 설명되어, 이 산림 지역의 $CO_2$ 수식 이미지 교환이 주로 빛에 의해 조절됨을 보여주었다. 이러한 관계식은 계절에 걸쳐 빠진 자료를 채워 넣는 자료 처리 과정에 효과적으로 사용될 수 있다. 마지막으로, 선형류 모형에 근거한 간단한 규모 분석에 의하면, 이류항의 효과가 NEE산출에 큰 영향을 미칠 수 있는 것으로 나타났다.

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