特别选题
王洪君,王为东,尹澄清,潘宏凯,卢金伟.湖滨带氧化还原环境的时空变化及其环境效应[J].环境科学学报,2007,27(1):23-27
湖滨带氧化还原环境的时空变化及其环境效应
- Spatio-temporal variation of redox condition in the littoral area and its environmental effects
- 基金项目：中科院知识创新工程重大项目(No.KZCX1-SW-12);国家高科技研究发展计划(No.2002AA601011-05);水利部科技创新项目(No.SCX2003-02-04)
- 作者
- 单位
- 王洪君
- 1. 中国科学院生态环境研究中心, 环境水质学国家重点实验室, 北京 100085; 2. 中国科学院研究生院, 北京 100039
- 王为东
- 中国科学院生态环境研究中心, 环境水质学国家重点实验室, 北京 100085
- 尹澄清
- 中国科学院生态环境研究中心, 环境水质学国家重点实验室, 北京 100085
- 潘宏凯
- 上海立信会计学院, 上海 201620
- 卢金伟
- 1. 中国科学院生态环境研究中心, 环境水质学国家重点实验室, 北京 100085; 2. 中国科学院研究生院, 北京 100039
- 摘要：在太湖梅梁湾,沿开阔水体至湖滨带方向,对植被型湖滨带(A区)、裸露型湖滨带(B区)和开阔水体(D区)水体中DO和水/沉积物Eh进行为期1a的现场观测.结果发现,梅梁湾水体DO时空变化明显.B区和D区水体中DO常年饱和,而A区DO浓度较低(年均(5.5±1.7)mg·L-1).在植物生长季,从开阔水体至湖滨植被区溶解氧浓度从12.7mg·L-1降到4.5mg·L-1;在非植物生长季则从9.7mg·L-1降到6.2mg·L-1.湖滨带水体Eh在150mV左右波动,空间变化趋势与溶解氧变化同步.沉积物Eh也表现出明显的时空变化,在植物生长季,各区沉积物均处于较强的还原状态(-158～-101mV);而在非植物生长季,由开阔水体向植被型湖滨带Eh逐渐升高.在沉积物的垂直剖面上,开阔水体Eh自表层沉积物向下逐渐降低,而在A区的植被覆盖区则是先降低,大概在5cm深处开始逐渐升高,于20cm深左右达到峰值.根据上述植被型湖滨带氧化还原环境的特点,可以推知进行湖滨带生态修复,有利于去除湖泊氮污染.
- Abstract：In-situ DOand Eh in macrophyte-covered (A) and non-macrophyte-covered (B) littoral zones and pelagic zone (D) were measured along the gradient from the open water to littoral zone area in Meiliang Bay of Taihu Lake for one year. The results showed that strong spatio-temporal variation of DOoccurred in Meiliang Bay. In Band Dzones, DOwas all-year saturated, while DOwas relatively low in Azone (annually (5.5±1.7) mg·L-1). DOdecreased in the water column from open water to macrophyte-covered area (12.7 mg·L-1 to 4.5 mg·L-1, 9.7 mg·L-1 to 6.2 mg·L-1, in the growing and non-growing seasons, respectively).The water-column Eh was about 150 mVand its spatial variation was similar with DO. Eh in the sediment also distinctively displayed spatio-temporal variation. In the growing season, the sediment in every zone was in a strong reductive state(-158 ～-101 mV). In the non-growing season, Eh increased gradually from Dto Azone. In the vertical section of sediment, Eh decreased gradually from the top to the bottom sediment in Dzone, while in Azone, firstly, Eh decreased, at 5 cm depth, Eh increased and the maximum occurred at 20 cm depth. These results indicated restoration of littoral zones could remove a large amounts of nitrogen.
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