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于桥水库菹草过度生长对水质的影响及成因分析

ISSN号：0493-2137
期刊名称：天津大学学报
时间：2011.1.1
页码：1-6
分类：X524[环境科学与工程—环境工程]
作者机构：[1]天津大学建筑工程学院,天津300072, [2]天津市引滦工程于桥水库管理处,天津301900, [3]天津市水利局引滦工程管理处,天津301900
相关基金：国家自然科学基金资助项目（50909070）;国家自然科学基金创新研究群体科学基金资助项目（51021004）
相关项目：重大水利工程安全性的基础理论研究

关键词：草型富营养化, 沉水植物, 菹草, 过度生长, 水质, 于桥水库, macrophytes-dominated eutrophication, submerged aquatic vegetation（SAV）, Potamogeton cris-pus（Linn.）, overgrowth, water quality, Yuqiao Reservoir

中文摘要：

通过对于桥水库水生植物种群群落和生物量的调查,分析水质监测成果和影响菹草生长的因素,研究菹草过度生长对水库水质的影响,探究于桥水库菹草疯长发生成因.对Lambert-Beer定律公式进行变换,分析水下太阳辐照度与水深和透明度的关系.结果表明：在菹草死亡腐败期,过量菹草衰亡释放的高营养盐和有机质对水质影响较大,恶化程度近1倍,持续时间约为1周;导致于桥水库出现菹草疯长现象的主要原因是光照度、透明度、水深和水温等条件;当透明度一定时,4月水位提高1,m,水下太阳辐照度将降低56.5%,菹草所能获得的光照能量大大减少,从而抑制了菹草过度生长.以Lambert-Beer定律为理论依据,提出采用提高水位、改变高水位运行时间抑制菹草过度生长的新方法.

英文摘要：

Based on the survey of aquatic plant species community and biomass and analysis of the observed water quality and the factors affecting the growth of Potamogeton crispus in Yuqiao Reservoir,the impact on water quality of excessive growth of Potamogeton crispus was studied and the reason for its outbreak was discussed.The results indicate that the release of high nutrient and organic has great impact on water quality during the decline period of Potamogeton crispus,with one time of deterioration of water quality for about one week.Solar radiation,water transparency,water depth and water temperature are the major causes for excessive growth of Potamogeton crispus in the reservoir.Based on transformation formula of the Lambert-Beer law,the relationship between solar radiation intensity under the surface of water and water depth and transparency was presented.Solar radiation intensity under the surface of water will be reduced by 56.5% if water level is raised by one meter in April when water transparency is definite.Thus,excessive growth of Potamogeton crispus can be suppressed because of the significant reduction of solar energy,which has provided the theoretical basis for the new method of increasing the water level and changing the high water level run-time during green period.

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