狐尾藻对园林水景污染水体的净化作用

园林水景植物不仅能美化景观，其治理水体富营养化现象也不可忽视。利用水生植物狐尾藻净化水体污染是近年来治理水质恶化的有效生态方法。以麦积区渭河城区段水面“翠湖”为研究区域，以狐尾藻为去污材料，运用点抽样—水槽培养方法开展室外试验，试验时间在2014年6-9月。结果表明，1～60 d，水体总氮、总磷、铵态氮、化学需氧量浓度整体呈下降趋势，而试验后期水体出现轻微的反弹污染；试验期始末，表层水体营养物质含量较底层的低。狐尾藻生命力强，适宜条件下繁殖速度较快。为防止狐尾藻后期腐烂，水体二度污染，保证狐尾藻去污时间相对持久，需对狐尾藻定期采割。

Purification Function of Myriophyllum on Contaminated Gardening Waterscape

While beautifying the waterscape, the application of aquatic plants can also control the contamination of the waters where they grow due to eutrophication. Myriophyllum is one of such plant species used recently. Taking “Cuihu Lake” in Maiji District of Tianshui, Gansu Province as research object, Myriophyllum was adopted to control water contamination from June to September in 2014. After the application of myriophyllum, the contents of total nitrogen(TN), total phosphorus (TP), ammonium nitrogen (NH₄⁺-N), chemical oxygen demand (COD) decreased during 1 to 60 d of the application. Slight rebound water pollution was observed in the later stage of experiment. The nutrient contents in surface water were lower than the deep one at the early stage. Myriophyllum has a strong vitality and breeds rapidly under suitable conditions. In order to ensure the function time of myriophyllum relatively longer, the decomposition and the second pollution of water must be avoided, therefore, it is imperative to collect newly grown myriophylum regularly.