摘要
以丽娃河为例,针对其富营养化现状及河道特征,在传统环境工程治理基础上,构建立体植物群落和动物群落,实施近自然恢复工程,通过比较丽娃河在工程前后的水质和动植物群落的变化来验证近自然恢复工程的效果.研究表明,近自然恢复工程实施一年后,总氮和总磷分别降至0.41mg/L和0.03mg/L;叶绿素a降至7.86μg/L,水质从原来的Ⅴ类降至Ⅱ类标准(GB3838-2002),水质在很大程度上得以改善.除此之外,近自然恢复工程通过直接引入滤食藻类的底栖动物和鲢鱼鳙鱼,在调控藻类生物量的同时也在一定程度上增加了动物群落的生物多样性.实践证明,近自然恢复工程在丽娃河案例中是行之有效的,且耗资少,可以在城市生态系统近自然恢复实践中推广.
Based on the eutrophication status and river channel characteristics of Liwa Creek, with the establishment of three-dimentional plant communities and animal communities, the ap prox-natrual restoration engineering was carried out after traditional environmental engineering techniques. By comparing the changement of water quality, plant and animal communities in Liwa Creek before and after the engineering, the effects of this approx-natural restoration engineer- ing were validated in this paper. The results show that after one-year＇s approx-natural restora- tion engineering measurement, TN and TP dropped respectively to 0.41 mg/L and 0.03 rag/L; contents of chlorophyll a dropped to 7.86 μg/L; Water quality was improved to a large degree, changing from the original class V to class H standard. Besides, with the direct introduction of zoo benthos which filter feeding algae, Silver carp and bighead carp, biodiversity of animal communities is improved to a certain degree during the regulation of algae biomass. Practice proves that approx-natural restoration engineering is effective in the case of Liwa Creek based on low cost, which can finally be promoted during the approx-natural restoration practice of urban eeosysterm.
出处
《华东师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第4期35-43,66,共10页
Journal of East China Normal University(Natural Science)
基金
上海市科技兴农重点攻关项目(沪农科攻字(2007)第1-4号)
上海市科委重大科技攻关研究(科技支撑)项目(08DZ1203102)
华东师范大学"211"三期重点学科建设项目
关键词
近自然恢复
城市河流
生态系统构建
食物链重建
approx-nature restoration
urban river
ecosystem restoration
food chain rebuilding
