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토양 내 인위적인 이산화탄소 누출에 따른 소나무와 굴참나무 묘목의 엽록소 함량과 생장 반응

Effects of Artificial CO2 Release in Soil on Chlorophyll Content and Growth of Pinus densiflora and Quercus variabilis Seedlings

  • 김현준 (고려대학교 BK21 Plus 에코리더양성사업단) ;
  • 한승현 (고려대학교 환경생태공학과) ;
  • 김성준 (고려대학교 환경생태공학과) ;
  • 장한나 (고려대학교 환경생태공학과) ;
  • 손요환 (고려대학교 환경생태공학과)
  • Kim, Hyun-Jun (BK21 Plus Eco-Leader Education Center, Korea University) ;
  • Han, Seung Hyun (Department of Environmental Science and Ecological Engineering, Korea University) ;
  • Kim, Seongjun (Department of Environmental Science and Ecological Engineering, Korea University) ;
  • Chang, Hanna (Department of Environmental Science and Ecological Engineering, Korea University) ;
  • Son, Yowhan (Department of Environmental Science and Ecological Engineering, Korea University)
  • 투고 : 2018.08.18
  • 심사 : 2018.10.25
  • 발행 : 2018.12.31

초록

본 연구는 이산화탄소를 인위적으로 주입하여 주입구로부터의 거리와 이산화탄소 플럭스에 따른 소나무와 굴참나무 묘목의 엽록소 함량과 생장반응을 살펴보고자 실행하였다. 이를 위하여 음성 EIT 시험지에서 2년생 소나무와 1년생 굴참나무 묘목을 2015년 5월에 식재하였으며, 2016년 6월 1일부터 30일까지 $6L\;min^{-1}$의 속도로 2.5 m 깊이의 토양에 이산화탄소를 주입하였다. 2016년 7월 중순 경에 엽록소 함량을 분석하였고, 2016년 5월과 11월에 근원경, 수고, 생물량을 측정하였다. 소나무 묘목의 엽록소 함량은 이산화탄소 플럭스와 유의한 관계를 보이지 않은 반면에 굴참나무 묘목의 엽록소 함량은 이산화탄소 플럭스의 증가에 따라 유의한 음의 상관관계(P<0.05)를 보였다. 또한, 근원경과 수고 생장률은 두 수종 모두 이산화탄소 인위누출 처리구의 이산화탄소 누출구로부터 5 m 이내에서 유의한 차이를 보였다. 특히, 두 수종의 근원경 및 소나무 묘목의 수고 생장률은 누출구에 가까워질수록 유의하게 증가하였지만, 굴참나무 묘목의 수고 생장률은 유의하게 감소하는 것으로 나타났다. ${\Delta}R/S$율은 지중 이산화탄소 농도가 증가할수록 두 수종 모두 증가하는 것으로 나타나 상대적으로 지하부로의 탄소 분배량이 촉진되는 것으로 사료된다. 본 연구결과는 향후 지중 저장된 이산화탄소의 누출에 따른 수종별 생리 생장 반응과 이를 이용한 누출감지 모니터링에 필요한 자료로 활용될 수 있을 것이다.

This study was conducted to analyze the responses of chlorophyll contents and growth of Pinus densiflora and Quercus variabilis seedlings on distance from the well and $CO_2$ flux after the artificial $CO_2$ release. From June 1 to 30, 2016, $CO_2$ gas was injected at the rate of $6L\;min^{-1}$ at the study site in Eumseong. Chlorophyll content was analyzed in the middle of July, 2016, and root collar diameter (RCD), height (H), and biomass were measured in May and December, 2016 after planting 2-year-old P. densiflora and 1-year-old Q. variabilis seedlings in May, 2015. The chlorophyll content of P. densiflora seedlings did not show a significant correlation with $CO_2$ flux, whereas the chlorophyll content of Q. variabilis seedlings showed a significant negative correlation with increasing $CO_2$ flux (P<0.05). The RCD and H growth rates of both species showed the significant difference in the distance from the well of the $CO_2$ anthropogenic release treatment. In particular, the RCD and H growth rate of P. densiflora seedlings and the RCD growth rate of Q. variabilis seedlings increased significantly as the seedlings were closer to the well, but the H growth rate of Q. variabilis seedlings decreased significantly. In addition, as the $CO_2$ concentration in the ground increases, ${\Delta}R/S$ ratio increases in both species, suggesting that the high $CO_2$ concentration in the soil promotes carbon distribution relative to the root part. The results of this study can be used as data necessary to monitor the $CO_2$ leakage and physiological and growth responses of both species to leakage of stored $CO_2$ in the future.

키워드

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Figure 1. Location (a) and composition (b) of Environmental Impact Evaluation Test Facility on Seepage of Geologically Stored CO2 (EIT) site.

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Figure 2. Schematic diagram of experiment site (a) showing locations of CO2 flux measurements on grid at 0 m, 2.5 m, 5.0 m, 7.5 m, and 10.0 m from the well (circles) and surface trace of the 2.5 m-depth CO2 injection well (horizontal line), and site renovation (b) drawing of Zone 1 showing locations of plots for Pinus densiflora and Quercus variabilis seedlings (Kim et al., 2018).

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Figure 3. Mean CO2 fluxes at 0 m, 2.5 m, 5.0 m, 7.5 m, and 10.0 m from the well during the CO2 release period. The –x and +x directions on the x-axis correspond to the south and north directions, respectively. Means with the same letter are not significantly different at the level of P<0.001.

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Figure 4. Relationships between CO2 flux and total chlorophyll for the Pinus densiflora and Quercus variabilis seedlings at the treatment plot.

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Figure 5. Root collar diameter (RCD; a, c) and height (H; b, d) growth rates of Pinus densiflora and Quercus variabilis seedlings from May to November in 2017. The asterisk (*) indicates the significant difference between control and CO2-elevated plots. Means with the same letter are not significantly different at the level of P < 0.0001 among distances (Duncan’s post hoc comparisons). Error bars denote standard errors of the means.

HOMHBJ_2018_v107n4_351_f0006.png 이미지

Figure 6. Relationships between CO2 flux and growth rates of root collar diameter (RCD; a) and height (H; b) for Pinus densiflora and Quercus variabilis seedlings at the treatment plot.

HOMHBJ_2018_v107n4_351_f0007.png 이미지

Figure 7. Correlation between mean CO2 flux and ΔR/S ratio for the Pinus densiflora and Quercus variabilis seedlings (a) and relationship between CO2 and O2 concentrations (b).

Table 1. Chlorophyll contents (a, b, and total) of Pinus densiflora and Quercus variabilis seedlings at the level of α = 0.05 (μg mg-1; mean±SE).

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