河道生态修复模式研究--以甘肃天水藉河为例

Study on the Mode of Ecological Regeneration in Drainage Basin——A Case Study in the Jihe River Basin,Gansu Province

干旱地区季相差异显著,河流总体流量小,河水自净能力有限,生态系统相对脆弱。以甘肃天水藉河为例,应用水生植物群落自然净化水质的原理,采取功能分区的方法,对河道的生态修复提出具体的研究方案。此研究方案是藉河一期改造工程的一部分。目前,一期工程已经完工,取得了较好的生态效益和经济效益。

In arid areas, the seasonal aspect is prominent, stream flow is low, the self-purification capability of waters is limited, and the ecosystems are relatively fragile. In this paper, a case study on the research scheme of regenerating the ecology in the Jihe River Basin, an arid area in Gansu Province, is carried out based on the principle of water quality self-purification of aquatic plant community and the regionalization of ecological functional areas. The research approach is a part of the first phase of ecological improvement project in the Jihe River Basin. The purposes of the project are to put forward a compound ecosystem idea based on the consideration of guaranteeing the water conservancy functions, that means to maintain the continuity of the river and its commensal complementarity with the urban area, improve the land use pattern along both riversides, regenerate the ecosystems, build the harmonious and stable wetland ecosystems by making overall planning and considering the local conditions, pay great attention to the organic connection between the drainage basin and the external environment, increase the biodiversity and the ecological functions of the wetland ecosystems in the drainage basin so as to achieve the social and economic sustainable development in the study area. At present, the first phase of the project has been completed, and the prospected ecological benefits and economic returns have been achieved.