습지 식물이 퇴적물의 생지화학적 반응에 미치는 영향 = The Effect of Aquatic Macrophytes on the Biogeochemistry of Wetland Sediments

국문 초록 (Abstract)

이 연구는 습지의 수생 식물이 퇴적물에 유발하는 생지화학적 변화들을 식물이 존재하는 퇴적물과 존재하지 않는 퇴적물의 공극수 및 퇴적물을 비교 분석함으로써 살펴보았다. 현장 실험을 통하여 식물의 생장기간 동안 rhizosphere에서 높은 SO₄^2- 농도가 관찰되었고, 이는 식물의 뿌리에서 방출된 산소가 주변 퇴적물에 존재하고 있는 sulfide를 산화시킨 결과라 판단된다. 측정된 AVS의 농도는 SO₄^2- 농도 증가를 보여주기에 충분한 양이 존재하였고, 관찰된 SO₄^2- 농도를 발생시키기 위해 AVS 산화에 요구되는 산소량은 0.85 g/m2·day로 다른 연구자들의 연구결과와 부합되는 결과를 도출하였다. 식물이 존재하지 않는 퇴적물의 경우 대부분의 AVS가 지표면에 존재하고 있는데 비해 식물이 존재하는 경우 rhizosphere에서 가장 높은 농도의 AVS가 존재하고 있는 것으로 보아 식물의 evapotranspiration에 의해 지표수내 SO₄^2-가 혐기성 상태인 퇴적물 내부로 활발히 이동되어 졌음을 알 수 있다. 그 외에도, 식물에 의해 증가된 유기물은 퇴적물에서 탄소 순환에 중요한 역할을 하는 β-glucosidase 효소의 활성도를 증가시켰다.

다국어 초록 (Multilingual Abstract)

This research investigates the influences of the presence of aquatic macrophytes on the changes of biogeochemistry in the sediments through the comparative analysis of porewater and sediments. From the in situ measurements, elevated SO₄^2- concentrations were observed in the rhizosphere during the growing season, which was resulted from the oxidation of reduced sulfide in the sediments by the oxygen release from the plant roots. There was sufficient AVS in the sediments to induce observed SO₄^2- concentrations. The amount of oxygen in the oxidation of AVS to produce observed SO₄^2- concentrations is 0.85 g/m2·day which is relevant to the results of other researches. The AVS concentrations in the vegetated sediments increased with the depth whereas there is higher mass of AVS in the surface of the non-vegetated sediments. This shows that evapotranspiration induces the transportation of SO₄^2- in the surface water into the anaerobic sediments. In addition, the elevated organic content caused by the presence of plants increased β-glucosidase activities which play an important role in the carbon cycle of the sediments.

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