Wen Zhi-dan, Song Kai-shan, Zhao Ying, Shao Tian-tian, Li Si-jia
Huan Jing Ke Xue. 2016 Jan 15;37(1):102-11.
The partial pressures of carbon dioxide p(CO2) and methane p(CH4) in the surface water of seven urban lakes in Changchun city, China (Nan Lake, Bei Lake, Yanming Lake, Shengli, Dilisuo, Changchun, Tianjia) , have been studied in both summer and autumn related to the environment and water quality parameters. The results indicated that both in summer and autumn, CH4 of seven lakes was all supersaturated, and CO2 was all supersaturated except in Nan lake and Shengli lake. For either p( C02) or p( CH4), there was a significant difference among different urban lakes (P < 0.05), and there was almost no obvious difference in the same lake between summer and autumn. The gas flux also had a significant difference among different urban lakes (P <0. 05). Except for Nan Lake and Shengli, all other lakes were the sources of atmospheric CO2 and CH4 both in summer and fall, and the discharge of CO2 to atmosphere by lakes was more than that of CH4. According to the correlation analysis, there was a significant negative relationship between p(CO2, CH4) and sunshine duration in summer (r p(CO2) = -0.48, P <0. 05; rp(CH4) = -0.63, P < 0.01). The sunshine duration could affect the concentrations of CO2 and dissolved oxygen in the water by influencing the photosynthesis of aquatic plants. There was also a significant negative relationship between p(CH4) and precipitation in summer (r p(CH4) = 0.44, P < 0.05), and between p (CO2) and air temperature in autumn (r p(cO2) = -0.39, P < 0.05). The correlation analysis between water quality parameters and p(CO2, CH4) showed that both p(CO2) and p(CH4) were negatively correlated with pH (r(Co2) = -0.51, r P(C4) = -0.82, P < 0.01), while they were positively correlated with salinity (r p(CO2) = 0.38, P < 0.05; r p(CH4) = 0.75, P < 0.01). The results suggested that the levels of nutrients in these urban lakes, which were related to the phytoplankton biomass, were not the main influencing factors for p(CO2) in surface water, and sunshine duration, pH, and salinity all had a greater impact on p (CO2) and p(CH4) in summer and autumn.
对中国长春市七个城市湖泊（南湖、北湖、雁鸣湖、胜利、 Dilisuo、长春、田家）表层水中二氧化碳分压p(CO₂)和甲烷分压p(CH₄)进行了研究，涉及夏季和秋季的环境及水质参数。结果表明，夏季和秋季，七个湖泊的CH₄均呈过饱和状态，除南湖和胜利湖外，CO₂也均呈过饱和状态。对于p(CO₂)或p(CH₄)，不同城市湖泊之间存在显著差异（P < 0.05），同一湖泊夏季和秋季之间几乎没有明显差异。气体通量在不同城市湖泊之间也存在显著差异（P < 0.05）。除南湖和胜利湖外，其他所有湖泊在夏季和秋季都是大气CO₂和CH₄的源，湖泊向大气排放的CO₂多于CH₄。根据相关性分析，夏季p(CO₂, CH₄)与日照时长呈显著负相关（r p(CO₂) = -0.48，P < 0.05；r p(CH₄) = -0.63，P < 0.01）。日照时长可通过影响水生植物的光合作用来影响水中CO₂和溶解氧的浓度。夏季p(CH₄)与降水量之间也存在显著负相关（r p(CH₄) = 0.44，P < 0.05），秋季p(CO₂)与气温之间存在显著负相关（r p(CO₂) = -0.39，P < 0.05）。水质参数与p(CO₂, CH₄)的相关性分析表明，p(CO₂)和p(CH₄)均与pH呈负相关（r(CO₂) = -0.51，r P(C₄) = -0.82，P < 0.01），而它们与盐度呈正相关（r p(CO₂) = 0.38，P < 0.05；r p(CH₄) = 0.75，P < 0.01）。结果表明，这些城市湖泊中与浮游植物生物量相关的营养水平不是表层水p(CO₂)的主要影响因素，日照时长、pH和盐度在夏季和秋季对p(CO₂)和p(CH₄)都有较大影响。
