Journal of Korean Society of Forest Science (한국산림과학회지)

Korean Society of Forest Science (한국산림과학회)
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Soil CO2 Efflux Dynamics in Response to Fertilization in Pinus densiflora and Quercus variabilis Stands

소나무와 굴참나무 임분의 시비에 따른 토양 CO2 방출 동태

  • Baek, Gyeongwon (Department of Forest Resources, Gyeongnam National University of Science and Technology) ;
  • Kim, Choonsig (Department of Forest Resources, Gyeongnam National University of Science and Technology)
  • 백경원 (경남과학기술대학교 산림자원학과) ;
  • 김춘식 (경남과학기술대학교 산림자원학과)
  • Received : 2020.06.30
  • Accepted : 2020.09.01
  • Published : 2020.09.30
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Abstract

This study compared soil CO2 efflux rates after fertilization, in Pinus densiflora and Quercus variabilis stands. Compound fertilizers were applied to the forest floor in March 2016, following a one-year calibration period (from March 2015 to February 2016). In situ soil CO2 efflux rates were measured every month during the two-year study periods, using an infrared gas analyzer with a closed chamber system. Mean annual soil CO2 efflux rates were higher following fertilizer application in the P. densiflora and Q. variabilis stands (P. densiflora: 2.180 μmol m-2 s-1; Q. variabilis: 1.977 μmol m-2 s-1) as compared with the rates measured during the calibration period (P. densiflora: 1.620 μmol m-2 s-1; Q. variabilis: 1.557 μmol m-2 s-1). The mean annual soil CO2 efflux rates in the unfertilized treatments of both stands were not significantly different between the two-year study periods. The Q10 values of fertilized treatments in Q. variabilis stands were higher in the fertilization period (3.41) than in the calibration period (3.14), whereas the Q10 values in P. densiflora stands did not change between the fertilization and calibration periods. The Q10 values of unfertilized treatments in the Q. variabilis stands were lower during the 2016-2017 period (3.69), than in the 2015-2016 period (3.85), whereas the Q10 values in P. densiflora stands were higher during the 2016-2017 period (3.65), than in the 2015-2016 period (3.15). These results indicate that the increase in soil CO2 efflux rates in P. densiflora stands could be more sensitive to fertilization compared with the rates in Q. variabilis stands.

본 연구는 유사한 입지에서 생육한 소나무와 굴참나무 임분을 대상으로 시비에 따른 토양 CO2 방출량을 비교하기 위해 수행하였다. 성숙한 소나무와 굴참나무 임분을 대상으로 시비처리 전 캘리브레이션 기간(2015년 3월~2016년 2월)을 가진 후, 2016년 3월에 복합비료를 표면 시비하였다. 토양 CO2 방출량은 2015년 3월부터 2017년 2월까지 2년 동안 매월 측정하였다. 토양 CO2 방출량의 월별 변동은 굴참나무와 소나무 임분 모두 시비 전(2015~2016년)과 시비 후(2016~2017년) 유사하였다. 연평균 토양 CO2 방출량의 경우 소나무 임분의 시비구는 2015~2016년 1.620 μmol m-2 s-1였으나 2016~2017년 2.180 μmol m-2 s-1로 유의적으로 증가(P < 0.05)하였으며, 굴참나무 임분의 시비구도 2015~2016년 1.557 μmol m-2 s-1에서 2016~2017년 1.977 μmol m-2 s-1로 약 0.420 μmol m-2 s-1 정도 증가하였다. 그러나 비시비구는 두 임분 모두 2015~2016년과 2016~2017년 사이 토양 CO2 방출량에 유의적인 차이가 없었다. Q10 값은 굴참나무 임분의 시비구가 2015~2016년 3.14에서, 2016~2017년 3.41로 증가하였으나 소나무 임분의 시비구는 Q10 값에 변화가 없었다. 비시비구의 Q10 값의 경우 굴참나무 임분은 2015~2016년에 3.85였으나, 2016~2017년은 3.69로 감소하였으며, 소나무 임분은 2015~2016년은 3.15였으나, 2016~2017년은 3.65로 증가하였다. 본 연구 결과에 따르면 유사한 입지환경에서 생육한 소나무와 굴참나무 임분의 토양 CO2 방출량은 시비 후 증가하였으며, 시비에 따른 토양 CO2 방출은 소나무 임분이 굴참나무 임분에 비해 반응이 크게 나타났다.

Keywords

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