Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Study on Evaluation of Carbon Emission and Sequestration in Pear Orchard

배 재배지 단위의 탄소 배출량 및 흡수량 평가 연구

  • Suh, Sanguk (Climate Change & Agroecology Division, National Institute of Agricultural Sciences) ;
  • Choi, Eunjung (Climate Change & Agroecology Division, National Institute of Agricultural Sciences) ;
  • Jeong, Hyuncheol (Climate Change & Agroecology Division, National Institute of Agricultural Sciences) ;
  • Lee, Jongsik (Climate Change & Agroecology Division, National Institute of Agricultural Sciences) ;
  • Kim, Gunyeob (Climate Change & Agroecology Division, National Institute of Agricultural Sciences) ;
  • Sho, Kyuho (Climate Change & Agroecology Division, National Institute of Agricultural Sciences) ;
  • Lee, Jaeseok (College of Bioscience and Biotechnology, Konkuk University)
  • 서상욱 (국립농업과학원 기후변화생태과) ;
  • 최은정 (국립농업과학원 기후변화생태과) ;
  • 정현철 (국립농업과학원 기후변화생태과) ;
  • 이종식 (국립농업과학원 기후변화생태과) ;
  • 김건엽 (국립농업과학원 기후변화생태과) ;
  • 소규호 (국립농업과학원 기후변화생태과) ;
  • 이재석 (건국대학교 생명과학과)
  • Received : 2016.11.02
  • Accepted : 2016.11.15
  • Published : 2016.12.31
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Abstract

Objective of this study was to evaluate the carbon budget on 40 years old pear orchard at Naju. For carbon budget assessment, we measured the soil respiration, net ecosystem productivity of herbs, pear biomass and net ecosystem exchange. In 2015, pear orchard released about $25.6ton\;CO_2\;ha^{-1}$ by soil respiration. And $27.9ton\;CO_2\;ha^{-1}$ was sequestrated by biomass growth. Also about $12.6ton\;CO_2\;ha^{-1}$ was stored at pruning branches and about $5.2ton\;CO_2\;ha^{-1}$ for photosynthesis of herbs. As a result, 25.6 ton of $CO_2$ per ha is annually released to atmosphere. At the same time about 45.7 ton of $CO_2$ was sequestrated from atmosphere. When it sum up the amount of $CO_2$ release and sequestration, approximately $20.1ton\;CO_2\;ha^{-1}$ was sequestrated by pear orchard in 2015, and it showed no significant differences with net ecosystem exchanges ($17.8ton\;CO_2\;ha^{-1}\;yr^{-1}$) by eddy covariance method with the same period. Continuous research using various techniques will help the understanding of $CO_2$ dynamics in agroecosystem and it can be able to present a new methodology for assessment of carbon budget in woody crop field. Futhermore, it is expected that the this study can be used as the basic data to be recognized as a carbon sink.

본 연구는 영년생 작물 중 배 재배지의 탄소수지 평가를 위하여 전남 나주 욱곡리 배 재배지에서 토양호흡, 초본류의 생태계순생산량 그리고 배 과수의 바이오매스와 배 재배지에서의 생태계순교환량을 측정하였다. 2015년 배 재배지의 연간 토양호흡량은 약 $25.6ton\;CO_2\;ha^{-1}$이었다. 바이오매스 측정을 통해 측정된 배나무 수체에 저장된 $CO_2$ 양은 $(-)27.9ton\;CO_2\;ha^{-1}$이었으며, 전정된 가지에 저장된 $CO_2$ 양은 약 $(-)12.6ton\;CO_2\;ha^{-1}\;yr^{-1}$이었다. 배 재배지 임상 하부에 자생하는 초본류 광합성에 의해 흡수된 $CO_2$ 양은 $(-)5.2ton\;CO_2\;ha^{-1}\;yr^{-1}$이었다. 이를 배 재배지 단위에서의 $CO_2$ 배출량과 흡수량으로 구분하여 보면, 연간 1 ha당 약 25.6 ton이 대기 중으로 배출되었으며 대기로부터 흡수된 $CO_2$는 약 (-)45.7 ton이었다. 이를 합산하면 연간 약 (-)20.1 ton의 $CO_2$가 대기 중으로부터 배 재배지로 흡수되는 것을 확인할 수 있었다. 이는 미기상학적인 방법을 이용하여 측정한 배 재배지 대기와 작물 및 토양권 간의 연간 $CO_2$ 교환량 $(-)17.8ton\;ha^{-1}$와 큰 차이를 보이지 않았다. 이러한 다양한 접근 방법을 이용한 연구는 배 재배지뿐만 아니라 영년생 작물 재배지 단위에서 농업생태계 구성요소들 간의 $CO_2$ 흐름을 파악하여 보다 효율적인 탄소수지 평가 연구를 위한 방법론을 제시하고 향후 농업생태계가 탄소 흡수원으로서 인정받기 위한 후속 연구의 기초 데이터로 사용될 수 있을 것으로 예상된다.

Keywords

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