Abstract
滆湖位于江苏省常州市西南13km处,水面面积164km<sup>2</sup>,平均水深1.26m,是太湖湖群的重要组成部分。其氮、磷平衡研究结果表明:①入湖氮、磷总量分别为4120.29t/a和270.03t/a;其中以河道入湖量最大,分别占入湖总量的71.9%和57.1%,其次是养殖投饵,分别占入湖总量的12.4%和29.9%;氮、磷的滞留系数分别为0.36和0.35,年滞留量分别为1481.6t和94.82t。②湖水的氮、磷负荷较大,但由于水草的吸收净化作用,湖水水质仍能保持较低水平。③网围养殖区底泥氮、磷释放强度大。非网围区水草根系的吸收对底泥氮、磷释放起到一定的抑制作用。;Gehu Lake is a macrophyte type shallow lake located in the Taihu Lake groups in the southeast plain to Changzhou City, Jiangsu Provence, with an area of 164 km<sup>2</sup>, and an average depth of 1.26m.The nutrient balance results show: (1) The total nutrients inputted are N 4120.29 t/a and P 270.03t/a, coming separately from its inlets(N 2961.86t/a, P 154.38t/a), land around the lake(N 45.83t/a, P 1.46t/a),cage aquaculture and artifitial food (N 509, 95t/a, P 80.60t/a), released sediments (N 362.20 t/a, P 19.16t/a) and atmospheric precipitation (N 240.45 t/a, P 14.43t,/a).The total nutrients drained are N 2632.9 It/a and P 175.21 t/a, outflowing through rivers (N 2172.llt/a,P 77.03t/a),harvest of fish (N 230.64t/a,P 59.66t/a),harvest of aquatic plants (N 210.OOt/a.P 37.80t/a)? irrigation and factory utilization around the lake (N 20.16t/a, P 0.72t/a).The N deposits 1487.38t/a(deposit efficient 0.361) and the P deposits 94.82t/a (deposit cofficient 0.3511).The main input and output ways of N and P are rivers.The input N by rivers occupies 71.88% of total input and P 57.17%. (2) Nutrient load is much higher, N is 25.12g/(m<sup>2</sup>·a) and P 1.647g/(m<sup>2</sup>·a). (3) The amount of nutrients released from the sediments of the cage aquaculture region is great.The daily releasing of N is 14.3 mg/m<sup>2</sup> and P 0.65mg/m<sup>2</sup>.
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