西湖营养元素时空分布及磷的平衡

笔者探讨了西湖氮、磷营养物和作为一般营养物的钙、镁、钾离子及溶解态二氧化硅的时空分布,同时也探讨了西湖磷的平衡问题,得出以下结论:（1）西湖水属严重富营养水.(2) 西湖水的氮、磷营养物浓度以及一般营养物浓度均有月际变化,并随测点而异.(3）为 西湖藻类生长为磷所限制.(4) 浮游植物体中的磷是西湖水中磷的主要形态.可溶性磷短暂的停留时间表明浮游植物代谢活动很活跃.(5) 西湖的主要磷污染源是入湖污水,而沉积物则是西湖水潜在重要的磷源.(6) 目前西湖容许磷负荷是0.5043吨 /年.

Temporal and Spatial Distribution of Some Nutrients and Phosphorus Equilibrium in the West Lake

Summarizing the data of some nutrients monitored in recent years in the West Lake of Hangzhou, the authors discuss the temporal and spatial distribution of nitric and phosphoric nutrients and general nutrients such as calcium, magnesium and potassium ions and dissolved silica. Phosphorus equilibrium in the West Lake is discussed as well.The following conclusions are reached:(1) The West Lake water is of serious eu'trophic grade.(2) Generally speaking, there are concentration variations in nitric and Phosphoric nutrients and the general nutrients with the change of months and with the shift of monitoring points in the West Lake water.(3) Algal growth in the West Lake water is limited by phosphorus.(4) The main Phosphoric form in the West Lake water is phosphorus in phytoplankton bodies. The short residence time of dissolved phosphate shows active metabolism of phytoplankton.(5) The influx of sewage is the main source of phosphorus pollution in the West Lake, while the sediment in the West Lake is a significant potential phosphorus source of the West Lake water.(6) The allowable phosphorus load is 0.5043t-yr-1 in the present conditions in the West Lake.The proposal is put forward to further study phosphoric nutrient exchange between the water and sediment in the West Lake.