Korean Journal of Agricultural and Forest Meteorology (한국농림기상학회지)

Korean Society of Agricultural and Forest Meteorology (한국농림기상학회)
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Assessment of Ecosystem Productivity and Efficiency using Flux Measurement over Haenam Farmland Site in Korea (HFK)

플럭스 관측 기반의 생태계 생산성과 효율성 평가: 해남 농경지 연구 사례

  • Indrawati, Yohana Maria (Interdisciplinary Program in Agricultural & Forest Meteorology, Seoul National University) ;
  • Kim, Joon (Interdisciplinary Program in Agricultural & Forest Meteorology, Seoul National University) ;
  • Kang, Minseok (National Center for AgroMeteorology)
  • Received : 2018.01.25
  • Accepted : 2018.03.26
  • Published : 2018.03.30
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Abstract

Time series analysis of tower flux measurement can be used to build quantitative evidence for the achievement of climate-smart agriculture (CSA). In this study, we have assessed the first objective of CSA (regarding ecosystem productivity and efficiency) for rice paddy-dominated heterogeneous farmland. A set of quantitative indicators were evaluated by analysing the time series data of carbon, water and energy fluxes over the Haenam farmland site in Korea (HFK) during the rice growing seasons from 2003 to 2015. Four different varieties of rice were cultivated during the study period in chronological order of Dongjin No. 1 (2003-2008), Nampyung (2009), Onnuri (2010-2011), and Saenuri (2012-2015). Overall at HFK, gross primary productivity (GPP) ranged from 800 to $944g\;C\;m^{-2}$, water use efficiency (WUE) ranged from 1.91 to $2.80g\;C\;kg\;H_2O^{-1}$, carbon uptake efficiency (CUE) ranged from 1.06 to 1.34, and light use efficiency (LUE) ranged from 0.99 to $1.55g\;C\;MJ^{-1}$. Among the four rice varieties, Dongjin No. 1-dominated HFK showed the highest productivity with higher WUE and LUE, but comparable CUE. Considering the heterogeneous vegetation cover at HFK, a rule of thumb comparison suggested that the productivity of Dongjin No1-dominated HFK was comparable to those of monoculture rice paddies in Asia, whereas HFK was more efficient in water use and less efficient in carbon uptake. Saenuri-dominated HFK also produced high productivity but with the growing season length longer than Dongjin No.1. Although the latter showed better traits for CSA, farmers cultivate Saenuri because of higher pest resistance (associated with adaptability and resilience). This emphasizes the need for the evaluation of other two objectives of CSA (i.e. system resilience and greenhouse gas mitigation) for complete assessment at HFK, which is currently in progress.

기후스마트농업(Climate-Smart Agriculture, CSA)이 성취되고 있는지에 대한 정량적인 평가방법을 구축하기 위해 타워 기반의 플럭스 관측 시계열 자료를 활용할 수 있다. 이 연구에서는 벼농사가 지배적인 전형적인 비균질 농경지를 대상으로 CSA의 첫 번째 목표와 관련된 생산성과 효율성 평가를 시도하였다. 이를 위해 해남 농경지에 위치한 KoFlux 사이트(HFK)에서 2003년부터 2015년까지 벼의 생장기간 동안에 관측된 탄소, 물 및 에너지 플럭스의 시계열 자료를 분석하여 일련의 정량적인 지표들을 평가하였다. 이 연구기간 동안에 HFK에서는 네 가지의 다른 품종(동진 1호; 2003-2008, 남평; 2009, 온누리; 2010-2011, 새누리; 2012-2015)의 벼가 경작되었다. 전반적으로 품종을 구분하지 않을 경우, 연구기간 동안의 HFK의 총일차생산(GPP)은 800 - 944 g C m-2, 물사용효율(WUE)은 1.91 - 2.80 g C kg H2O-1, 탄소사용효율(CUE)은 1.06 - 1.34, 그리고 광사용효율(LUE)은 0.99 - 1.55 g C MJ-1이었다. 벼 이외의 다른 식생이 포함된 HFK의 비균질성을 고려하여 어림 잡아 비교해 보면, 네 품종 중에서 동진1호를 재배했을 때에 HFK의 생산성이 아시아의 단일 벼논의 생산성과 비슷했고 WUE도 높았던 반면에 CUE는 상대적으로 낮았다. 또한, 새누리를 재배했을 때에도 HFK가 비슷하게 높은 생산성을 보였으나 동진1호보다 생장기간이 상대적으로 길었다. 따라서 동진1호가 지배적인 HFK가 CSA의 관점에서 더 좋은 특성을 보여 준다. 그러나 현실적으로는 농부들이 해충 저항성이 동진1호보다 높은 새 누리를 재배하고 있다. 이는 CSA의 나머지 두 목표의 하나인 탄력(resilience) 향상을 통한 적응력 강화와 관련된 것으로 온실가스 방출 저감을 포함한 총체적인 평가가 이루어져야 함을 시사하며, 이에 대한 평가와 분석이 현재 진행 중에 있다.

Keywords

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