Journal of Korean Society of Forest Science (한국산림과학회지)

Korean Society of Forest Science (한국산림과학회)
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Fine Root Biomass in Pinus densiflora Stands using Soil Core Sampling and Minirhizotrons

토양 코어 및 미니라이조트론을 이용한 소나무 임분의 세근 바이오매스 연구

  • Han, Seung Hyun (Department of Environmental Science and Ecological Engineering, Graduate School, Korea University) ;
  • Yoon, Tae Kyung (Department of Environmental Science and Ecological Engineering, Graduate School, Korea University) ;
  • Han, Saerom (Department of Environmental Science and Ecological Engineering, Graduate School, Korea University) ;
  • Yun, Soon Jin (Department of Environmental Science and Ecological Engineering, Graduate School, Korea University) ;
  • Lee, Sun Jeoung (Center for Forest and Climate Change, Korea Forest Research Institute) ;
  • Kim, Seoungjun (Department of Environmental Science and Ecological Engineering, Graduate School, Korea University) ;
  • Chang, Hanna (Department of Environmental Science and Ecological Engineering, Graduate School, Korea University) ;
  • Son, Yowhan (Department of Environmental Science and Ecological Engineering, Graduate School, Korea University)
  • 한승현 (고려대학교 대학원 환경생태공학과) ;
  • 윤태경 (고려대학교 대학원 환경생태공학과) ;
  • 한새롬 (고려대학교 대학원 환경생태공학과) ;
  • 윤순진 (고려대학교 대학원 환경생태공학과) ;
  • 이선정 (국립산림과학원 기후변화연구센터) ;
  • 김성준 (고려대학교 대학원 환경생태공학과) ;
  • 장한나 (고려대학교 대학원 환경생태공학과) ;
  • 손요환 (고려대학교 대학원 환경생태공학과)
  • Received : 2014.01.22
  • Accepted : 2014.02.26
  • Published : 2014.03.31
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Abstract

Fine root distribution was investigated in Pinus densiflora stands using soil core sampling and minirhizotrons, and conversion factors and regression equations were developed for converting minirhizotron data into fine root biomass. Fine root biomass was measured by soil core sampling from October, 2012 to September, 2013 once a month except for the winter, and surface area of fine roots was estimated by minirhizotrons from May to August, 2013 once a month. Fine root biomass and surface area were significantly higher in the upper soil layers than in the lower soil layers. Fine root biomass showed seasonal patterns; the mean fine root biomass ($kg{\cdot}ha^{-1}$) in summer (3,762.4) and spring (3,398.0) was significantly higher than that in autumn (2,551.6). Vertical and seasonal patterns of fine root biomass might be related to the soil bulk density, nutrient content and temperature with soil depth, and seasonal changes of soil and air temperature. Conversion factors (CF) between fine root surface area from minirhizotron data and fine root biomass from soil core sampling were developed for the three soil depths. Then a linear regression equation was developed between the predicted fine root biomass using CF and the measured fine root biomass (y = 79.7 + 0.93x, $R^2=0.81$). We expect to estimate the long-term dynamics of fine roots using CF and regression equation for P. densiflora forests in Korea.

본 연구는 소나무 임분을 대상으로 토양 코어 샘플링과 미니라이조트론 방법을 이용하여 세근의 분포를 파악하고, 미니라이조트론 자료를 세근 바이오매스로 환산할 수 있는 변환계수와 회귀식을 개발하는 목적으로 수행되었다. 토양 코어 샘플링은 2012년 10월부터 2013년 9월까지 겨울을 제외하고 매월 1회씩 총 9회 실시하여 세근 바이오매스를 측정하였고, 미니라이조트론을 이용하여 2013년 5월부터 8월까지 매월 1회씩 총 4회 세근 표면적을 측정하였다. 0-30 cm 토양 깊이에서 세근 바이오매스와 표면적은 지표에 가까울수록 유의하게 높았으며, 계절별 바이오매스($kg{\cdot}ha^{-1}$)는 여름(3,762.4)과 봄(3,398.0)에 가을(2,551.6)보다 유의하게 높은 값을 보였다. 이와 같은 토양 깊이별 분포는 토양의 양분, 용적밀도 그리고 온도 등의 차이 때문으로 사료되며, 계절적 경향은 대기 온도 및 토양 온도변화에 의해 나타나는 것으로 보인다. 또한 토양 깊이별 세근 표면적과 바이오매스 사이의 변환계수를 구하고, 이를 통하여 미니라이조트론 자료를 환산한 세근 바이오매스와 토양 코어 샘플링 자료인 실측값 사이의 선형회귀식(y = 79.7 + 0.93x, $R^2=0.81$)을 개발하였다. 본 연구에서 개발된 변환계수 및 회귀식은 추후 국내 소나무림의 장기적인 세근 동태를 추정하는데 활용될 수 있을 것으로 기대된다.

Keywords

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