본 연구는 국내 염습지 해안 복원의 주요 식물인 갈대와 내건성 대표 식물인 억새의 지역별 유전자형 분석을 통해 지역별 복원종자 적용에 대한 타당성을 검증고자 하는 연구로서, SNP를 활용한 근연관계 분석 결과 억새는 홍성군 집단이 다른 지역과 상이한 유전적 변이를 보인 반면, 갈대는 모든 지역에서 동시다발적인 변이양상이 나타낸다. 이를 통하여 억새의 경우 우리나라 전역에 발생하는 건조지에서 억새시료를 사용할 때는 지역별로 수집한 종자를 활용하는 것이 합리적이나 부득이하게 다른 지역의 식물 자원을 사용한다고 해도 유전적인 교란이 크게 발생하지 않을것으로 보인다. 갈대의 경우 전 지역에서 유전적 변이가 다양하며 억새에 비하여 유전적 변이가 상대적으로 많이 나타나고 있기 때문에 염류 피해지의 복원에 활용할 수 있는 자원인 갈대의 경우 종자를 지역별로 수집하기 위한 다양한 인프라를 구축하여 향후 복원 사업에 대비하여야 한다.

본 연구에서는 갈대군락의 영양염 물질수지 모델 구축을 위한 기초연구로서, 갈대군락 Mesocosm 실험을 통해 수층-갈대(뿌리, 잎, 줄기)-토양의 영양염(DIN, DIP) 농도의 춘계 및 하계 모니터링 결과를 이용하여 물질수지를 산정하였으며, 결과는 다음과 같다. 1) 갈대의 생체량은 춘계에는 지하경이 지상경에 비해 약 6.3~9.7% 높으며, 하계에는 지상경이 지하경에 비해 약 19.2~21.2% 높게 나타났으며, 갈대의 성장속도는 Mesocosm Tank A가 Mesocosm Tank D에 비해 지상경과 지하경 모두 2~3배 정도 빠르게 나타났다. 2) Mesocosm Tank에서의 갈대의 영양염(DIN, DIP) 농도는 춘계와 하계 모두 각각 2~3%로 차이가 적었다. 3) Mesocosm Tank별 생체량의 차이는 최대 23%로 나타나지만, 갈대가 흡수하는 영양염의 농도는 최대 3% 정도로 차이가 적었다.

Common reed (Phragmites australis) is widespread in reclaimed land and wetland habitats. Every year, the common reed produces extensive colonies by means of underground rhizomes and ground-surface stolons. From an agricultural point of view, the common reed's large biomass is a good material for supplying organic matter. However, it has not yet been studied in terms of seedling production, transplanting conditions, and decomposition characteristics in reclaimed land. Seeds were harvested from the native common reed in Saemangeum, South Korea, the previous year and stored on an open field. The seeds were sowed in the greenhouse at the beginning of April. Common reed decomposition was studied from June to September, with the use of coarse mesh (5 mm) stem litterbags, on three samping dates and with five replicate packs per sample. These packs were dug in five soil condition (low-salinity topsoil, subsoil, high-salinity topsoil, subsoil, paddy topsoil) to 0.2 m and 0.4 m depth. The highest germination rate of common reed seeds was observed in non-salt solution, but the exhibited germination rate was 70% at 9.38 dS m-1. The plant height of young reed decreased steadily with increasing salinity, but leaf number did not decrease by 9.38 dS m-1. The survival rate of the two-year-old reed was 83.3%, which was 35% higher than that of the one-year reed. The transplant success rate was 0% in the no vinyl mulching in the soil, but the first year and second year seedlings survived rates were 63% and 83.3%, respectively, in vinyl mulching. Common reed decomposition rates were faster low salinity than high salinity. All nutrient contents were found to fluctuate significantly with time by soil conditions. We also need to study the growth rate of reed transplanting seedlings by soil moisture contents and the comparison of degradation in common reed tissues.

We investigated the ecological characteristics of reed populations growing in Korea and tried to select reed populations showing better growth patterns in waste landfill leachate. To examine the growth characteristics, 14 reed populations from various habitats were collected. Four reed populations were from inland reclaimed habitats, 4 reed populations from brackish or salt marsh habitats, and 6 reed populations from fresh water habitats. Total plant biomass after the treatment with landfill leachate showed that Daebudo and Nanjido reed populations had the higher biomass with 3755 g DW/pot and 3305 g DW/pot, respectively. Reed populations being sampled from the higher salinity and landfill habitats had relatively higher total biomass than that of other reed populations. Especially reed populations from landfill habitats showed higher biomass. Reed populations from Songjiho and Daebudo, which were believed to have tolerance to salt stress, also showed good growth patterns. Population from the fresh water habitats exhibited relatively lower tolerance to leachate treatment compared to others. From the results, we could conclude that reed populations from Nanjido and Daebudo with higher biomass and better salt tolerance were able to good candidates for purification of waste landfill leachate.