본 연구는 내륙인공습지의 생태적 특성 분석을 통하여 효율적 운영 및 관리를 위한 기초정보를 제공하고자 주남저수지 인공습지의 관속식물상과 생활형을 조사하였다. 관속식물상은 48과 118속 147종 1아종 8품종의 총 156분류군이 확인되었다. 식물구계학적 특정식물은 가시연꽃, 자라풀, 눈여뀌바늘 등 11 분류군이 확인되었다. 귀화식물은 소리쟁이, 좀개소시랑개비, 털별꽃아재비, 돼지풀 등 26분류군이 확인되었으며, 귀화율과 도시화지수는 각각 16.7%와 8.1%였다. 국화과 식물이 전체 귀화식물의 절반을 차지하였다. 생활형 분석 결과, 일년생식물과 수생식물의 비율이 가장 높았으며, 이들 두 생활형이 전체 관속식물상의 73.8%를 차지하였다. 수생식물은 구와말, 네가래, 생이가래 등 48분류군이 출현하였으며, 정수식물의 비율이 가장 높은 것으로 분석되었다.

The key objective of this study was to evaluate trophic state and empirical water quality models along with analysis of fish trophic guilds in relation to water chemistry (N, P). Trophic state index (TSI), based on total phosphorus (TP) and chlorophyll-a (CHL), ranged between oligotrophic and hypereutrophic state, by the criteria of Nürnberg(1996), and was lower than the trophic state of total nitrogen (TN). Trophic relations of Secchi depth (SD), TN, TP, and CHL were compared using an empirical models of premonsoon (Pr), monsoon (Mo), and postmonsoon (Po). The model analysis indicated that the variation in water transparency of Secchi depth (SD) was largely accounted (p < 0.001, range of R2 : 0.76–0.80) by TP during the seasons of Mo and Po and that the variation of CHL was accounted (p < 0.001, R2 = 0.70) up to 70% by TP during the Po season. The eutrophication tendency, based on the TSITP vs. TSIN:P were predictable (R2 ranged 0.85–0.90, p < 0.001), slope and y intercept indicated low seasonal variability. In the mean time, TSIN:P vs. TSICHL had a monsoon seasonality in relation to values of TSIN:P during the monsoon season due to a dilution of reservoir waters by strong monsoon rainfall. Trophic compositions of reservoir fish reflected ambient contents of TN, TP, and CHL in the reservoir waters. Thus, the proportions of omnivore fish increased with greater trophic conditions of TP, TN and CHL and the proportions of insectivore fish decreased with greater trophic conditions.