Abstract
Mass loss and changes of mineral nutrient during the decomposition of Typha angustata for 13 months from November in 1998 to December in 1999, were investigated in small watercourse in Boryeong, Chungnam Province, Korea. After 13 months, remaining mass of leaves, stems and rhizomes was 34.7%, 59.2%, 7.2%, respectively. The rate of weight loss of the rhizomes was significantly higher than those of the leaves and stems. The decay rate of leaves, stems and rhizomes was 1.06, 0.52, $2.63 yr^{-1}$, respectively Initial concentration of nutrients in leaves, stems and rhizomes was 11.5, 9.0, 14.5 mg/g for N, 0.30, 0.27, 0.47 mg/g for P, 20.7, 26.9, 26.6 mg/g for K, 14.50, 4.77, 3.25 mg/g for Ca, and 1.99, 1.32, 2.07 mg/g for Mg, respectively. Except for Ca, concentrations of nutrients in rhizomes were higher than those in stems and rhizomes. There was no immobilization period during the decomposition of each organ of T. angustata. In case of K, most are lost during the first 1 month. Phosphorus in decomposing leaves and stems lost 58% and 66%, respectively, of the initial P capital within 1 month. [Decay rate, Decomposition, Immobilization, Macrophytes, Nutrients, Typha angustata].
1998년 11월부터 1999년 12월까지 13개월 동안 대형 수생식물인 애기부들의 분해와 분해 과정에 따른 각 기관별 영양염류 함량의 변화를 조사하였다. 13개월 후 잎, 줄기, 지하경의 잔존량은 각각 34.7%, 59.2%, 7.2%로 줄기의 분해가 가장 느렸고 지하경의 분해가 빠른 것으로 나타났다. 분해상수는 잎, 줄기, 지하경이 각각 1.06, 0.52, 42.63yr^{-1}$이었다. 잎, 줄기, 지하경의 초기 영양염류 함량은 질소 11.5, 9.0, 14.5 mg/g, 인 0.30, 0.27, 0.47 mg/g, 칼륨 20.7, 26.9, 26.6 mg/g, 칼슘 14.50, 4.77, 3.25 mg/g, 그리고 마그네슘이 1.99, 1.32, 2.07 mg/g이었다. 애기부들 각 기관의 분해과정 중 부동화 기간은 없었으며, 각 영양염류의 60% 이상이 5개월 이내에 물 속으로 방출되는 것으로 나타났다.
