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引用本文:邓焕广,张智博,刘涛,殷山红,董杰,张菊,姚昕.城市湖泊不同水生植被区水体温室气体溶存浓度及其影响因素.湖泊科学,2019,31(4):1055-1063. DOI:10.18307/2019.0409
DENG Huanguang,ZHANG Zhibo,LIU Tao,YIN Shanhong,DONG Jie,ZHANG Ju,YAO Xin.Dissolved greenhouse gas concentrations and the influencing factors in different vegetation zones of an urban lake. J. Lake Sci.2019,31(4):1055-1063. DOI:10.18307/2019.0409
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城市湖泊不同水生植被区水体温室气体溶存浓度及其影响因素
邓焕广, 张智博, 刘涛, 殷山红, 董杰, 张菊, 姚昕
聊城大学环境与规划学院, 聊城 252000
摘要:
为了解城市湖泊不同水生植被区水体温室气体的溶存浓度及其影响因素,于2015年4-11月按每月2次的频率采用顶空平衡法对聊城市铃铛湖典型植被区——菹草区、莲藕区和睡莲区表层水中CO2、CH4和N2O的溶存浓度进行监测,计算水中温室气体的饱和度和排放通量,并测定水温(T)、pH、溶解氧(DO)、叶绿素a及营养盐浓度等理化指标,以探究水体环境因子对温室气体溶存浓度的影响.结果表明,铃铛湖各植被区水体温室气体均处于过饱和状态,是大气温室气体的"源";莲藕区CH4浓度、饱和度和排放通量均显著高于菹草区,而各植被区N2O和CO2均无显著性差异;不同植被区湖水中DO、总氮(TN)、总磷(TP)和硝态氮(NO3--N)浓度具有显著差异,其中DO、TN和NO3--N浓度均表现为菹草区最高,莲藕区最低,而TP浓度则正好相反;各植被区温室气体浓度和水环境参数间的相关分析和多元回归分析的结果表明,水生植物可通过影响水体的理化性质对温室气体的产生和排放产生显著差异影响,在菹草区亚硝态氮(NO2--N)、NO3--N、T和DO是控制水体温室气体浓度的主要因子;睡莲区为TP和pH;莲藕区则为pH、NO2--N和DO.
关键词:  温室气体  溶存浓度  影响因素  水生植被  城市湖泊  铃铛湖
DOI:10.18307/2019.0409
分类号:
基金项目:国家自然科学基金项目(41401563)和山东省自然科学基金项目(ZR2014JL028)联合资助.
Dissolved greenhouse gas concentrations and the influencing factors in different vegetation zones of an urban lake
DENG Huanguang, ZHANG Zhibo, LIU Tao, YIN Shanhong, DONG Jie, ZHANG Ju, YAO Xin
School of Environment and Planning, Liaocheng University, Liaocheng 252000, P. R. China
Abstract:
Dissolved concentrations of carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) in the surface water were measured using the headspace equilibrium method fortnightly from April to November of 2015 in the Potamogeton crispus zone, Nymhaea tetragona zone and Nelumbo nucifera zone of the Lake Lingdang in Liaocheng City. The saturations and emission fluxes of the greenhouse gases were calculated based on the two-layered diffusion model. Moreover, water temperature, pH, dissolved oxygen (DO), chlorophyll-a and the nutrient concentrations in the water body were also measured in order to investigate their influences on the dissolved greenhouse gas concentrations. The results showed that the dissolved concentrations of greenhouse gases in different vegetation zones were all supersaturated, which indicated that Lake Lingdang was a source of atmospheric greenhouse gases. The concentrations, saturations and emission fluxes of CH4 in N. nucifera zone were significantly higher than those in P. crispus zone but no significant difference between the data of N2O and CO2 in different vegetation zones. The concentrations of DO, total nitrogen (TN), total phosphorus (TP) and nitrate (NO3--N) in three vegetation type zones also had significant differences. The average concentrations of DO, TN and NO3--N were highest in the P. crispus zone and lowest in the N. nucifera zone, but it was on the contrary for the average TP concentrations. The results of correlation analysis and multivariate regression analysis between the greenhouse gases and the water environment parameters suggested that the aquatic plants could affect the production and emission of greenhouse gases by influencing the physicochemical properties of water body. Greenhouse gas concentrations in lake water were mainly correlated to NO2--N, NO3--N, water temperature and DO in the P. crispus zone, while mainly correlated to TP and pH in the N. tetragona zone, and pH, NO2--N and DO in the N. nucifera zone.
Key words:  Greenhouse gas  dissolved concentration  influencing factor  aquatic vegetation  urban lake  Lake Lingdang
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