摘要
白洋淀是华北平原最大的淡水内陆湖泊,其水体富营养化问题近年来日益突出。为了提出一种通过优化白洋淀台田区中台田及其相间水道的结构治理白洋淀水体富营养化的方法,利用白洋淀实测水体数据,计算了白洋淀台田水道不同取样位置的综合营养状态指数(TLI指数),结合台田区结构指标——台田坡度、水道长度、水道宽度等,分析了台田区结构与白洋淀水体富营养化程度变化的关系。研究结果表明,白洋淀水体富营养化程度改善幅度西高东低,差异显著。水道水体的TLI指数减小的关键阶段是水道水体与外界水体交换频繁的0～30m;台田区的结构指标中,水道长度对台田降低水体富营养化程度影响最大;0m处的TLI指数值影响该台田TLI指数的减小幅度。从白洋淀水体富营养化治理角度出发,建议改建台田结构为水道长度为175～209m或293～340m、台田坡度小于23°或33.5°～45.7°和水道宽度为5～7.7m的贯通水道。
Baiyangdian Lake is the largest freshwater inland lake of north China Plain. The eutrophication problem in recent years has become increasingly prominent. Differently from other freshwater lakes, Baiyangdian Lake is crisscrossed with raised fields and the adjacent channels between raised fields. Raised field is a widely distributed land use form. Health J Carney, from the perspective of agricultural science, proved lakes with raised fields were better in the interception of nitrogen, phosphorus nutrients than common lakes. To further study and find a kind of method to control eutrophication of Baiyangdian Lake, the impact of raised fields on Baiyangdian Lake eutrophication was analysis according to the trophic level index （TLI） calculated with monitored water quality data and raised field structure index-raised field＇s scope, channel＇s length, channel＇s width by SPASS and Excel softwares. One aim of this study is to analyze the relationship between raised field canals’structure of Baiyangdian Lake and the water-body eutrophication through studying relations of raised field structure and canal water’s TLI. The other aim is to give advice to the government how to rebuild raised fields out of consideration of water quality. The results showed that raised fields still have great potential in governance Baiyangdian Lake eutrophication. Even water of hyper eutropher level, still can be reduced to middle eutropher level or light eutropher level. The TLI reduce key stage in channel is 0-30 m. In this stage, the channel water exchanges with the outside water frequently. A channel＇s length affects the extent raised fields reduces TLI of water in the channel. The TLI of 0 m influence the range of TLI reduction in the channel. The advised raised field index is that channel＇s length is 175-209 m or 293-340 m, channel＇s width is 5-7.7 m and raised field＇s scope is less than 23° or 33.5°-45.7°.
出处
《湿地科学》
CSCD
北大核心
2013年第2期259-265,共7页
Wetland Science
基金
国家水体污染控制与治理科技重大专项项目(2009ZX07209)资助
