氮在不同生态特征沟渠系统中的衰减规律研究  

Nitrogen degradation efficiency in channels with different ecological characteristics

作　　者：王沛芳[1] 王超 胡颖[2] 

机构地区：[1]水文水资源与水利工程科学国家重点实验室,江苏南京210098 [2]浅水湖泊综合治理与资源开发教育部重点实验室,江苏南京210098

出　　处：《水利学报》2007年第9期1135-1139,共5页Journal of Hydraulic Engineering

基　　金：国家"973"项目(2002CB412303);国家自然科学基金(50379012);教育部重点项目(10086);河海大学创新基金部分成果

摘　　要：在分析河流水体中氮的迁移转化过程和衰减机理的基础上,选择太湖流域宜兴大浦镇境内林渠和赵渠两条农田排水沟为观测现场,开展氮在不同生态特征沟渠中的衰减规律研究,分析不同尺度和水动力条件对水体中氮衰减规律的影响,探讨水体中氮截留、吸附、转化的内部机理。研究结果表明,沟渠的生态特征,特别是几何尺度和水动力特性与水体中总氮衰减过程紧密相关;沟渠流速越大,水体中总氮衰减率越大;水生植物密度越大总氮衰减率也越大。On the basis of analysis of nitrogen transformation and degradation mechanism, in-situ investigations have been conducted on two agricultural drainage channels in the Taihu Basin. Focuses of the investigations are put on the following aspects： surveying the degradation principle in channels with different ecological features, analyzing the effects of scales and hydrodynamic characteristics on nitrogen degradati has been features, with the on, studying the mechanism of nitrogen adsorption, demonstrated that the total nitrogen degradation especially increase of transformation and retention processes. It rates are closely related to the ecological the geometric scales and hydrodynamic characteristics of river channels. It increases flow velocity and the increase of density of aquatic plants.

关 键 词：氮 生态特征 衰减效率 林渠 赵渠 

分 类 号：X143[环境科学与工程—环境科学]