한국농림기상학회지, 제 7권 제1호(2005) (pISSN 1229-5671, eISSN 2288-1859)
Korean Journal of Agricultural and Forest Meteorology, Vol. 7, No. 1, (2005), pp. 45~50
ⓒ Author(s) 2014. CC Attribution 3.0 License.


한반도 논에서의 에디공분산 방법에 의한 CO2와 수증기 플럭스 관측

이정택, 이양수, 김건엽, 심교문
농업}학기술원

(2005년 01월 24일 접수; 2005년 03월 29일 수락)

CO2 and Water Vapor Flux Measurement by Eddy Covariance Method
in a Paddy Field in Korea

Jeongtaek Lee, Yangsoo Lee, Gunyeob Kim, Kyomoon Shim
National Institute of Agricultural Science and Technology, Suwon, Korea

(Received January 24, 2005; Accepted March 29, 2005)

ABSTRACT
This study was conducted to measure and understand the exchange of CO2 and water in a rice canopy. Eddy covariance system was installed on a 10m tower along with other meteorological instruments. CO2 flux and surface energy balance were measured throughout the whole growing season in 2003 over a typical paddy field in Icheon, Korea. During the early growth stage in May and June, most of net radiation was partitioned to latent heat flux with daytime Bowen ratio of 0.3 to 0.7. Evapotranspiration (i.e., daily integrated latent heat flux) typically ranged from 3 to 4 mm d-1, with even higher rates on sunny days. Daily integrated net ecosystem exchange (NEE) of CO2 increased with increasing solar radiation and leaf area index (LAI). The NEE was especially high during the stages of young panicle formation and heading. On 1 June 2003, when the rice field was flooded, it was a weak sink of atmospheric CO2 with an uptake rate of 9.1 gm-2d-1. Despite frequent rainy and cloudy conditions in summer, maximum NEE of 36.2 gm-2d-1 occurred on 31 July prior to heading stage. As rice crop senesced after early September, the NEE decreased.

Keyword: CO2, Eddy covariance, Energy flux, Evapotranspiration, LAI

MAIN

적요

우리나라의 주요 농업 생태계인 논에서 벼 생육기간 중의 CO2와 에너지 교환을 정량화하고 분석(평가하기 위하여 미기상학적인 방법인 에디 공분산법으로 물질/ 에너지 플럭스를 측정하였다. 측정장소는 한반도 중부 지방의 대표적인 벼농사 지대인 경기도 이천시 부발읍 신원리 농업과학기술원 이천 시험지 플럭스 측정 지점 (37o18’20.34"N, 127o30’40.46"E) 에서 수행되었다. 벼군락 장파복사의 방출은 대기로부터의 장파복사량보다 100Wm−2정도 많았다. 벼논에서 이앙 후 에너지 배분은 잠열 플럭스로 더 많이 배분되었고, 보웬 비는 0.3-0.7 정도였다. 이앙 후 대기중의 수증기 농도는 이앙 전에 비하여 2gm−3 정도 높아졌다. 벼 논에서 CO2 농도는 야간이 780~820gm−3 주간에는 약 650gm−3정도 였다. 일사량 증가에 따른 이산화탄소 흡수량은 엽면적 지수가 높을수록 높았으며 특히 유수형성기-출수기에서 가장 높았다.

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