摘    要杭州市河流众多、水系发达，存在着严重水体污染的现象，河流湖泊富营养化频繁，严重影响了河流湖泊的正常功能。在修复污染水体的各种措施中，生态工程技术即生态浮床技术是一种低成本、低能耗、易管理、利于资源化、利于改善整体水生态环境的新技术，此项修复技术目前已在大部分城市中广泛运用。

生态浮床技术是以水生植物为主体，运用无土栽培技术原理，在植物、动物、昆虫以及微生物的共同作用下使环境水质得以净化，达到修复和重建水体生态系统目的的技术。

底泥是水环境的重要组成部分，是水体中各种污染物的最终储存场所。88537

本文以河道底泥的理化性状来反映城市河道系统设立生态浮床改善水质后的健康状况以及生态浮床的可用性和实用性，为城市河道保护提供指导和依据。

通过对浮床底泥和对照底泥的研究，得出以下结论：

（1）总体来讲，由于河道生态浮床的建立时间短，生态浮床的建立对河道底泥的理化性状的影响基本不存在。

（2）浮床底泥的总氮含量、总磷含量、有机质含量、N:P比值、pH值和电导率高于对照底泥，同时浮床底泥的总碳含量、C:P比值和δ15N值低于对照底泥，但这些指标均无显著差异。

（3）浮床底泥的C:N比值和δ13C比值极显著低于浮床底泥，说明生态浮床对外源性有机质的吸收利用效果好。

  关键词：河道； 生态浮床； 底泥； 理化性质

Summary Hangzhou, a large number of rivers, water developed, there are serious water pollution phenomenon, river lakes eutrophication frequently, seriously affecting the normal function of rivers and lakes。 In the various measures to repair polluted water, ecological engineering technology, namely, ecological floating bed technology is a low-cost, low-power, easy to manage, conducive to resources, and improve the overall water ecological environment of new technologies,this repair technology is now widely used in most cities。

The ecological floating bed technology is based on aquatic plants as the main body, using the principle of soilless cultivation technology, under the combined action of plants, animals, insects and microorganisms, the environmental water quality can be purified to achieve the purpose of repairing and reconstructing the water ecosystem technology。

Sediment is an important part of the water environment and is the final water pollutants in the final Storage place。

In this paper, the physical and chemical properties of the river sediments are used to reflect the health status of the urban river system to improve the water quality and the availability and practicability of the ecological floating bed, and provide guidance and basis for the protection of the urban river channel。

Through the study of floating bed sediment and control sediment, the following conclusions are drawn:

(1) In general, due to the establishment time of the ecological floating bed, the influence of the establishment of the ecological floating bed on the physical and 

chemical properties of the sediment is basically absent。

(2) The total nitrogen content, total phosphorus content, organic matter content, N: P ratio, pH value and electrical conductivity of the sediments were higher than those of the control sediment, and the total carbon content, C: P ratio and δ15N value lower than the control sediment, but these indicators were no significant differences。

(3) The C: N ratio and the δ13C ratio of the sediment bed were significantly lower than those of the floating bed, indicating that the ecological floating bed had good effect on the absorption and utilization of exogenous organic matter。源Y于Y优E尔Y论L文W网wwW.yOueRw.com 原文+QQ752018.766