武汉工程大学李思悦团队和中科院水生所徐军团队合作文章WR: 浅水湖泊中溶解二氧化碳和甲烷浓度对环境升温的响应
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第一作者:袁丹妮 讲师
通讯作者:李思悦 教授(武汉工程大学),徐军 研究员(中国科学院水生生物研究所)
论文DOI:10.1016/j.watres.2024.121116
Fig. 3. Variation of partial pressure of dissolved CO2 (pCO2) and methane concentration (dCH4) under control (C) and warming (W) treatments across different months (A-B) and overall differences in pCO2and dCH4 among different months (C-D).3.5℃升温对CO2和CH4浓度和排放的影响有限(Fig. 3A and 3B)。相反,CO2和CH4排放呈现出显著的时间变化((Fig. 3C and 3D)。中试系统中pCO2的均值从四月的234.4 μatm逐渐增加到八月的471.2 μatm(图3),随着时间的变化,水中溶解的CO2由不饱和逐渐过渡为饱和。此外,dCH4的平均浓度从五月(64.39 nmol L-1)增加到七月(560.78 nmol L-1),然后在八月降低至343.25 nmol L-1,中试生态系统中CH4浓度存在明显的过饱和。
Fig. 4. Relationships of the log molar ratio of pCO2 to dCH4with total phosphorus (TP), phosphate (PO43-), total nitrogen (TN), ammonium (NH4+), nitrate (NO3-), nitrite (NO2-), pH, dissolved oxygen (DO), electrical conductivity (EC), water temperature (WT), dissolved organic carbon (DOC) and chlorophyll a fluorescence (Chl-a).线性回归显示,pCO2与氮和磷呈显著正相关关系,与水温、DOC呈显著正相关,与pH和溶解氧(DO)呈显著负相关(Fig. 4)。dCH4浓度与TP、TN、NO2-、水温和DOC呈显著正相关,但与pH、DO和电导率(EC)呈显著负相关(Fig. 4)。
Fig. 5. Environmental drivers of CO2 and CH4 concentrations. (A) Principal component analysis (PCA) of the environmental factors reveals that samples are not clearly grouped. (B) TN and (C) WT shown a strong correlation with the PC1 (R2 = 0.57 and R2 = 0.56, respectively). (D) Pairwise comparisons of environmental factors are displayed, with a color gradient representing Spearman’s correlation coefficients. pCO2and dCH4 was related to each environmental factor by Mantel tests (euclidean distance).我们分析了考虑距离因素后的CO2和CH4浓度差异与环境因素之间的相关性(Fig. 5)。在中试系统中,TN、温度和pH是影响CO2和CH4浓度最为显著的因素,而与NO3-、DO、EC和Chl-a之间相关性较弱。此外,检测到pCO2与其它各种形态的营养盐及DOC之间存在显著正相关关系。
Danni Yuan, Siyue Li, Y. Jun. Xu, Shiwang Ma, Kairui Zhang, Jingquan Le, Yang Wang, Bingjie Ma, Ping Jiang, Liuqing Zhang, Jun Xu. Response of dissolved carbon dioxide and methane concentration to warming in shallow lakes, Water Research, 2024, 121116. doi: 10.1016/j.watres.2024.121116
https://www.sciencedirect.com/science/article/abs/pii/S0043135424000174