비식생 갯벌 표층에서 탄소 저장률 산정 및 영향인자 분석 : 함평만과 순천만
Calculation of carbon storage rate and analysis for influencing factors at the surface layer in unvegetated tidal flats : Hampyeong Bay and Suncheon Bay
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본 연구에서는 갯벌 퇴적물의 퇴적률을 직접 측정(퇴적률 판과 퇴적률 봉)한 자료를 이용하여 탄소 저장률을 산정하는방법을 제시하고, 산정된 갯벌의 탄소 저장률에 대한 영향인자를 분석하였다. 우리나라 서해안의 함평만 갯벌과 남해안의 순천만 갯벌에서 조사된 퇴적률과 토양탄소밀도를 이용하여 퇴적물의 탄소 저장률을 산정하였다. 함평만 갯벌의 평균 탄소 저장률은 –458 Mg/yr, 순천만 갯벌의 평균 탄소 저장률은 8,044 Mg/yr로 나타났다. 퇴적률에 따른 탄소 저장률 회귀함수는 선형적으로 증가하였으며, 동일한 퇴적률 증가 조건에서의 탄소 저장률은 순천만 갯벌이 함평만 갯벌보다 1.5배 높았다. 강우량이 많을수록 갯벌의 퇴적률과 탄소 저장률이 증가하였으며, 강우량 대비 탄소 저장률의 증가율은 순천만 갯벌이 함평만 갯벌보다 4배 이상 높았다. 본 연구를 통해, 갯벌 퇴적물 내 탄소 저장률은 퇴적물 입도가 작을수록, 유기탄소량이 많을수록, 또한 강우에 의한 하천 퇴적물의 유입량이 많을수록 증가함을 알 수 있었다.
Abstract
In this study, we propose a method to estimate carbon storage rate using data from direct measurements of sedimentation rates of tidal flat sediments (sedimentation rate plates and a rod of sedimentation rate, and analyze the factors influencing the estimated carbon storage rate of tidal flats. The carbon storage rate of sediments was estimated using the sedimentation rate and soil carbon density investigated in the Hampyeong Bay tidal flat on the west coast and the Suncheon Bay tidal flat on the south coast. The average carbon storage rate of the Hampyeong Bay tidal flat was -458 Mg/yr, and the average carbon storage rate of the Suncheon Bay tidal flat was 8,044 Mg/yr. The regression function for carbon storage rate according to the sedimentation rate increased linearly, and the carbon storage rate in the Suncheon Bay tidal flat was 1.5 times higher than that in the Hampyeong Bay tidal flat under the same sedimentation rate increase conditions. As rainfall increased, the sedimentation rate and carbon storage rate of the tidal flat increased, and the increase rate of carbon storage rate relative to rainfall was more than four times higher in the Suncheon Bay tidal flat than in the Hampyeong Bay tidal flat. Through this study, it was found that the carbon storage rate in tidal flat sediments increases as the sediment particle size becomes smaller, the amount of organic carbon increases, and the amount of river sediment inflow due to rainfall increases.
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