采用成熟的生态浮床技术，对引黄灌区中度污染河流水体治理的可行性及其效果进行了技术示范研究。结果显示：生态浮床对工程示范区域水体中的TN、NH4＋-N、CODMn平均相对去除率分别为59.4％、59.7％和24.7％；浮游植物的优势种由前期的小环藻（Cyclotella sp．）和啮齿隐藻（Cryptomonas erosa）变为后期的小环藻和尖针杆藻（Synedra acusvar）；浮游植物的Margalef多样性指数和Shannon-wiener多样性指数分别由2.17、2.04提升至2.85、2.44，且同时段浮床区域监测点的值高于对照点。研究表明，生态浮床技术在西部高寒地区夏季有较好的生态适应性和水质改善效果，但针对西部地区特定的气候和水文条件，如何延长生态浮床的作用时间有待进一步的研究。%The feasibility and efficiency of ecological floating bed system (EFBS )for water restoration of moderately polluted ditch in Ningxia Yellow-river irrigating region was studied.The results showed that through the purification of EFBS,the relatively average removal rates of TN,NH4+-N,and CODMn in water reached 59. 4%,59.7% and 24.7% respectively.During the repair of EFBS,dominant genus of phytoplankton were Cyclotella sp.and Cryptomonas erosa in the earlier,Cyclotella sp.and Synedra acusvar in the later experimental time.After the restoration,Margalef diversity index and Shannon-wiener diversity index of phytoplankton were increased from 2.1 7 and 2.04 to 2.85 and 2.44 respectively,and the value of the EFBS area was higher than that of the control point.All of these showed that EFBS could be used in the cold western alpine region of China, and there was a significant efficiency of the EFBS in the purification and ecosystem functions restoration of pollution water in western of China.Meanwhile,according to the specific climatic and hydrological conditions in the western region of China,how to prolong the action time of the EFBS needed further study.
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