수변 녹지의 시공 유형별 탄소저장 효과 - 한강수계 경안천변 매수토지 구간 사례 -
Effects of Carbon Storage by Construction Type of Riparian Greenspaces - Case Study of Purchased Land along Gyeongan-cheon in Han River Basin -
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본 연구에서는 시공 후 7∼17년 경과된 한강수계 경안천 유역 매수토지 내 수변 녹지 구간에 대해 숲형, 초지형, 숲-초지형, 습지형 등 4개 유형별 탄소저장 효과를 분석하였다. 연구 대상 수변 녹지는 총 320개소, 896,088m2로 탄소저장량은 총 388.8ton, 단위면적당 탄소저장량은 평균 4.5±0.3t/ha이었다. 숲형, 초지형, 숲-초지형, 습지형의 총 탄소저장량은 각각 287.8ton, 51.3ton, 27.0ton, 22.7ton으로 숲형의 비중이 74%로 가장 높았다. 단위면적당 평균 탄소저장량은 각각 6.3±0.5t/ha, 3.6±0.3t/ha, 3.7±0.4t/ha, 1.6±0.4t/ha로 숲형이 가장 높고 습지형이 가장 낮게 나타났다. 연평균 탄소저장량은 35.3±8.1ton/yr, 단위면적당 탄소저장량 효과는 연평균 4.6±0.5t/ha/yr이었으며, 숲형, 초지형, 숲-초지형, 습지형의 연평균 탄소저장량은 각각 26.2ton/yr, 4.7ton/yr, 2.5ton/yr, 2.1ton/yr이었다. 연구 대상지의 수변 녹지는 약 682kL의 휘발유 소비에 상당하는 탄소량을 저장하고 있으며, 본 연구에서 도출된 단위면적당 탄소저장량을 4대강 수계에 시공된 수변 녹지 전체에 적용할 경우, 약 11,700ton의 탄소 저장 효과가 있을 것으로 추정된다. 수변 녹지 내 식생 외에 토양의 탄소저장량까지 고려할 탄소저장량은 더욱 크다고 볼 수 있으며, 수변 녹지의 확대 조성과 시공 유형, 수목의 생장 정도, 관리방식 등에 따라 탄소흡수 효과는 더욱 증가할 것이다. 본 연구는 방대한 수변 녹지의 시공 후 7~17년 경과된 현 시점에 다양한 유형별로 실제 생장량과 탄소저장량 효과를 계량화하고, 기초 자료를 구축하였다는 점에서 의미가 있으며 향후 시공 유형별 탄소흡수원으로서의 효율적인 계획, 설계 및 관리방안 수립과 예상 효과 도출시에 활용될 수 있을 것으로 기대한다.
Abstract
In this study, the carbon storage effect by construction type was analyzed for riparian greenspaces 7 to 17 years after construction in the purchased land along the Gyeongan-cheon basin. There were a total of 320 riparian greenspaces (896,088m2) in the study area. The total carbon storage of riparian greenspaces was 388.8tons, and the average amount of carbon storage per unit area was 4.5±0.3t/ha. The total carbon storage of forest type, meadow type, forest-meadow type, and wetlands type was 287.8tons, 51.3tons, 27.0tons, and 22.7tons, respectively, and the proportion of forest type was the highest with 74%. The average carbon storage per unit area was 6.3±0.5t/ha, 3.6±0.3t/ha, 3.7±0.4t/ha, and 1.6±0.4t/ha, respectively, with the forest type being the highest and the wetland type the lowest. The average annual carbon storage was 35.3±8.1ton/yr, and the effect of carbon storage per unit area was 4.6±0.5t/ha/yr on average. And the average annual carbon storage of forest type, meadow type, forest-meadow type, and wetlands type was 26.2ton/yr, 4.7ton/yr, 2.5ton/yr, and 2.1ton/yr, respectively. The riparian greenspaces of the study area store carbon equivalent to the use of about 682kL of gasoline. If the amount of carbon storage per unit area is applied to the entire riparian greenspaces created in the four major rivers, about 11,700tons of carbon storage is effective. In addition to plants in riparian greenspaces, it can be seen that the amount of carbon storage that takes into account the carbon storage of soil is larger, and the effect of carbon absorption will further increase according to the increase in composition of riparian greenspaces, construction type, and the growth degree of trees. This study is meaningful in that it quantifies the effects of growth and carbon storage by construction type for vast riparian greenspaces 7 to 17 years after construction and establishes basic data. In the future, it is expected that it can be used for efficient composition as a carbon sink by construction type, establishment of management plans, and deduction of expected effects.
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