摘要
为研究不同跌水方式和水生植物对水体中溶解氧含量(DO)的影响,探讨污染水体增氧技术,以期为黑臭水体的生态治理提供理论依据。通过设置多级台梯、瀑布和坡流3种跌水方式以及9种水生植物水培试验,测定各处理水中溶解氧含量。结果表明:(1)在高差为3m的跌水过程中,跌水增氧效果为台阶式>瀑布式>斜坡式,其增氧率分别为66.7%、20%、6.7%;(2)九种水生植物对水体溶解氧含量的影响从强到弱排序为:梭鱼草≈再力花≈水葫芦≈花叶芦竹>苦草≈美人蕉≈风车草>金鱼藻≈狐尾藻;(3)不同生活型植物根系泌氧能力为:沉水植物>挺水植物>浮水植物,水体中溶解氧含量受3种类型植物的生理学特性和生长周期、光照强度、温度等影响。
To study the effects of different waterfall methods and aquatic plants on the dissolved oxygen content in water bodies and to explore the oxygenation technology of polluted water bodies to provide a theoretical basis for the ecological treatment of black smelly water bodies.In this paper,we set up three types of water plunging methods:multi-stage ladder,waterfall,and slope flow,as well as nine types of aquatic plant hydroponics tests,and measured the dissolved oxygen(DO)content in each treatment water.The results show that(1)in the process of plunging water with a height difference of 3 m,the effect of oxygen-enhancing by falling water is step type>waterfall type>slope type,and their oxygenation rates are 66.7%,20%,and 6.7%respectively.(2)The effects of nine aquatic plants on the dissolved oxygen content of the water column in order of strength to weakness:Pontederia cordata≈Thalia dealbata≈Eichhornia crassipes≈Arundo donax'Versicolor'>Vallisneria natans≈Canna indica≈Cyperus involucratus>Ceratophyllum demersum≈Myriophyllum verticillatum.(3)Oxygen secretion capacity of the root system of plants of different life types is:submerged plants>aquatic plants>floating plants and the dissolved oxygen content in the water body is affected by the physiological characteristics of the three types of plants and the growth cycle,light intensity,temperature,and so on.
作者
韦建华
李茵茵
杨钙仁
WEI Jianhua;LI Yinyin;YANG Gairen(Forestry College,Guangxi University,Nanning,Guangxi 530004,China)
出处
《热带农业科学》
2023年第8期18-26,共9页
Chinese Journal of Tropical Agriculture
基金
广西重点研发计划项目(No.桂科AB22080103)
国家自然科学基金项目(No.31360134)。
关键词
台阶跌水
植物泌氧
溶解氧
waterfall approach
aquatic plants
dissolved oxygen
