Korean Journal of Agricultural and Forest Meteorology (한국농림기상학회지)

Korean Society of Agricultural and Forest Meteorology (한국농림기상학회)
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Soil Respiration Rates in Cryptomeria japonica D. Don, Chamaecyparis obtusa Endl., and Quercus glauca Thunb. Stands

삼나무, 편백, 종가시나무 임분의 토양호흡에 관한 연구

  • Gyeongrin Baek (Division of Environmental and Forest Science, Gyeongsang National University) ;
  • Gyeongwon Baek (Division of Environmental and Forest Science, Gyeongsang National University) ;
  • Byeonggil Choi (Division of Environmental and Forest Science, Gyeongsang National University) ;
  • Hojin Kim (Division of Environmental and Forest Science, Gyeongsang National University) ;
  • Jihyun Lee (Division of Environmental and Forest Science, Gyeongsang National University) ;
  • Choonsig Kim (Division of Environmental and Forest Science, Gyeongsang National University)
  • 백경린 (경상국립대학교 환경산림과학부) ;
  • 백경원 (경상국립대학교 환경산림과학부) ;
  • 최병길 (경상국립대학교 환경산림과학부) ;
  • 김호진 (경상국립대학교 환경산림과학부) ;
  • 이지현 (경상국립대학교 환경산림과학부) ;
  • 김춘식 (경상국립대학교 환경산림과학부)
  • Received : 2022.12.17
  • Accepted : 2023.05.01
  • Published : 2023.06.30
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Abstract

The quantification of soil respiration rates is important to understand carbon cycles of forest ecosystems. Soil respiration rates were assessed using Li-8100A soil flux system in one evergreen broadleaved (Quercus glauca Thunb.) and two coniferous (Cryptomeria japonica D. Don and Chamaecyparis obtusa Endl.) stands from May 2020 to April 2022 in southern Korea. Monthly variations of soil respiration rates were higher in the Q. glauca stand than in the C. japonica and the C. obtusa stands. The mean soil respiration rates were significantly higher in the Q. glauca stand (2.63µmol m-2 s-1) than in the C. japonica (0.93µmol m-2 s-1) and C. obtusa (0.99µmol m-2 s-1) stands. The three stands showed exponential relationships between soil respiration rates and soil temperature (R2 = 0.44-0.80). The sensitivity of temperature (Q10 values) to soil respiration rates was highest in the Q. glauca stand (5.13), followed by the C. obtusa (3.10) and C. japonica (2.58) stands. These results indicate that soil respiration rates can be increased more in evergreen broadleaved stands than in coniferous stands under enhanced soil temperature.

본 연구는 동일한 임분연령과 유사한 입지환경에서 생육한 삼나무, 편백, 종가시나무 임분을 대상으로 2020년 5월부터 2022년 4월까지 2년 동안 토양호흡을 측정하고 토양 환경요인과의 관계를 조사하였다. 토양호흡은 세 임분 모두 뚜렷한 월별 변동을 보였으며 종가시나무 임분의 변동이 삼나무나 편백 임분에 비해 크게 나타났다. 조사기간 동안 평균 토양호흡은 종가시나무 임분이 2.63µmol m-2 s-1로, 편백 0.99µmol m-2 s-1, 삼나무 0.93µmol m-2 s-1에 비해 유의적으로 토양 CO2 방출(P < 0.05)이 크게 나타났다. 한편, 토양 pH는 종가시나무가 pH 4.87로 삼나무 pH 5.30, 편백 pH 5.14에 비해 낮은 값을 보였으나, 토양수분 함량, 토양온도, 토양 전기전도도, 토양 유기탄소 함량 등은 임분 간 유의한 차가 없었다. 조사한 임분 모두 토양온도와 토양호흡 사이에 유의적인 지수함수모델 관계가 있었으며(R2 = 0.44~0.80), Q10 값은 삼나무 2.58, 편백 3.10, 종가시나무 5.13으로 종가시나무 임분이 가장 크게 나타났다. 본 연구 결과에 따르면 종가시나무 임분은 삼나무와 편백 임분에 비해 토양호흡이 많고 토양온도 상승에 가장 크게 반응할 것으로 나타났다.

Keywords

Acknowledgement

이 논문은 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(No. 2020R1A2C1005791).

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