[논문]소나무와 굴참나무 임분의 가지 분해율과 탄소 및 질소 동태 비교

최병길; 백경원; 김형섭; 손요환; 김춘식

doi:10.5532/kjafm.2021.23.2.89

소나무와 굴참나무 임분의 가지 분해율과 탄소 및 질소 동태 비교
Comparisons of Decomposition Rates, Carbon and Nitrogen Dynamics of Branches in Pinus densiflora and Quercus variabilis Stands 원문보기

한국농림기상학회지 = Korean Journal of Agricultural and Forest Meteorology, v.23 no.2, 2021년, pp.89 - 99

최병길 (경상국립대학교 산림자원학과) , 백경원 (경상국립대학교 산림자원학과) , 김형섭 (고려대학교 환경생태공학과) , 손요환 (고려대학교 환경생태공학과) , 김춘식 (경상국립대학교 산림자원학과)

초록
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본 연구는 경상남도 산청과 진주 지역으로부터 서로 인접하여 생육하고 있는 소나무와 굴참나무를 대상으로 기질의 특성, 임분 종류, 토양 및 기상 환경요인 등이 가지의 분해율과 탄소 및 질소 동태에 어떠한 영향을 끼치는지 알아보기 위해 수행하였다. 직경 2.0~4.0cm, 길이 10cm의 가지 시료를 30cm × 30cm 크기의 매쉬 백에 넣은 후 2018년 5월 각 임분의 임상에 매설하였으며 2018년 8월과, 11월, 그리고 2019년 2월과, 5월에 각 조사구에서 회수하여 가지의 분해율과 탄소 및 질소 동태를 조사하였다. 매설 12개월 후 가지 분해율은 산청-소나무(4.49 %) < 진주-소나무(5.75 %) < 산청-굴참나무(20.01 %) < 진주-굴참나무(24.68 %) 순서로 나타나 두 지역 모두 굴참나무 가지가 소나무에 비해 빠른 분해를 보였다. 탄소 및 질소의 경우 굴참나무는 순 무기화를 나타냈으며, 소나무는 탄소 및 질소의 축적 및 저장이 나타나 수종 간 다른 경향을 보였다. 본 연구 결과에 따르면 서로 인접하여 생육하고 있는 두 수종의 분해율과 탄소 및 질소 동태는 지역·환경적 요인보다 수종 간 초기 질소 농도, C/N율과 같은 기질의 특성이 더 큰 영향을 미치는 것으로 나타났다.

Abstract ▼ AI-Helper

This study was carried out to understand how factors of decomposition such as quality of the substrate (tree species), forest types, and soil·meteorological conditions affect decomposition rates and dynamics of carbon (C) and nitrogen (N) of branches in adjacent Pinus densiflora and Quercus variabilis stands in Sancheong and J inju in Southern Korea. The branch bags (30 cm × 30 cm) with branch samples (a diameter of 2.0 - 4.0 cm and length of 10 cm) were placed on the forest floor at each stand in May 2018. The branch bags were collected in August and November 2018, February and May 2019, respectively. The decomposition rates of branches in P. densiflora stands were 4.49 % for Sancheong, and 5.75 % for Jinju. Whereas, the decomposition rates in Q. variabilis were 20.01 % for Sancheong, and 24.68 % for Jinju, respectively. The decomposition of branches was more rapid in Q. variabilis compared with P. densiflora in both regions. C and N in decomposed branches were more mineralized in Q. variabilis, whereas C and N were more accumulated in P. densiflora. These results indicated that the decomposition rates, C and N of decomposed branches may be affected by differences in substrate quality such as initial N concentration and C/N ratio rather than differences between both regions including different environmental factors.

주제어

표/그림 (5)

표 Table 1. General stand characteristics of Pinus densiflora and Quercus variabilis stands
표 Table 2. Soil physical and chemical properties at 0-10cm depth in Quercus variabilis and Pinus densiflora stands
그림 Fig. 1. Location of the study site in Jinju and Sancheong (a : Quercus variabilis stand, b : Pinus densiflora stand, c : branch bags, d : branch samples of P. densiflora, e : branch samples of Q. variabilis after 12 months incubation).
그림 Fig. 2. Monthly variation of air temperature (Line) and air humidity (Bar) in Pinus densiflora and Quercus variabilis stands. JP (Jinju, P. densiflora), JQ (Jinju, Q. variabilis), SQ (Sancheong, Q. variabilis), SP (Sancheong, P. densiflora).
그림 Fig. 3. Remaining mass of branch (a), C/N ratio (b) and N concentration (c), NAI of N (d), C concentration (e) and NAI of C (f) of branches in Pinus densiflora and Quercus variabilis stands during the decomposition period (from May 2018 to May 2019). JP (Jinju, P. densiflora), JQ (Jinju, Q. variabilis), SQ (Sancheong, Q. variabilis), SP (Sancheong, P. densiflora). Vertical bars represent standard error. Different letters on the bar represent a significant difference at P<0.05.

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