Methane emissions in two small shallow neotropical lakes: The role of temperature and trophic level

Understanding the Spatial Heterogeneity of CO2 and CH4 Fluxes from an Urban Shallow Lake: Correlations with Environmental Factors

“…The heavily polluted sites in our study are significantly influenced by human activities (such as the introduction of domestic sewage and surface rain runoff, water diversion from Shangyuanmen (1.0 × 10 5 t/d) and Daqiao drink water treatment plant (8 × 10 4 t/d) into lake, tourist entertainment and rubbish in lake park, and water treatment project with higher aquatic plants); therefore nutrient substance content and physicochemical property of these sites will be different from natural water bodies (field lakes, reservoirs), which can lead to differences in GHG emissions [49]. However, our results from heavily polluted sites were still smaller than the eutrophic and stagnant lakes [22,25], which is related to the eutrophic status and adverse environmental conditions, such as lower ORP and DO and higher OM in sediment. Figure 9.…”

“…Moreover both the emission of CH 4 and the ratio of CH 4 to CO 2 emissions increase markedly with seasonal 2 Journal of Chemistry increases in temperature [2,16,21]. Moreover, higher ebullition and diffusion of CH 4 are observed in eutrophic than oligomesotrophic lakes [22]. Riera et al [23] also reported that bog lakes with high dissolved organic carbon (DOC) waters have higher fluxes of CO 2 and CH 4 than clear-water lakes with low DOC.…”

“…in Yellow River estuary [18]; water chestnut in oxbow Lake, Italy [25]; Spartina alterniflora in Bay of Fundy, Canada [38]); the differences in vegetation may be the main reason. CH 4 fluxes from heavy pollution sites (1#, 2#, 5#, and 8# sites) in our study were close to the Poyang Lake [35], Yangtze River estuary [36], 5 Netherlands lakes [37], the Bay of Fundy [38], and the Shrimp pond of Min River estuary [39] and were greater than those from natural wetlands and less polluted lakes, such as 11 North America lakes [11], Polegar Lake [22], Yellow River estuary wetlands [18], Sparkling Lake [23], 30 boreal lakes [41], reservoirs [40,42], and less polluted sites (3#, 4#-6#, 7#, 9#, and 10# site) in this study. The heavily polluted sites in our study are significantly influenced by human activities (such as the introduction of domestic sewage and surface rain runoff, water diversion from Shangyuanmen (1.0 × 10 5 t/d) and Daqiao drink water treatment plant (8 × 10 4 t/d) into lake, tourist entertainment and rubbish in lake park, and water treatment project with higher aquatic plants); therefore nutrient substance content and physicochemical property of these sites will be different from natural water bodies (field lakes, reservoirs), which can lead to differences in GHG emissions [49].…”

Fluxes of greenhouse gases at two different aquaculture ponds in the coastal zone of southeastern China

“…At present, research on GHG emissions from aquatic ecosystems is focused on inland freshwaters, including natural lakes (Huttunen et al, 2003;Xing et al, 2005), rivers (Aufdenkampe et al, 2011;Clough et al, 2011), ditches (Schrier-Uijl et al, 2011) and reservoirs (Soumis et al, 2004;Diem et al, 2012). These reports suggested that the magnitude and pattern of spatiotemporal variations in GHG emission are influenced by weather, water thermal regime, nutrient content, hydrodynamic condition and biological activity (Zhu et al, 2010;Palma-Silva et al, 2013;Natchimuthu et al, 2014). However, very few studies have presented GHG fluxes from aquatic environments in coastal zones, especially fluxes caused by anthropogenic disturbances on aquatic environments, including aquaculture ponds.…”

Emergent Macrophytes Alter the Sediment Composition in a Small, Shallow Subtropical Lake: Implications for Methane Emission

“…Methane emissions are also influenced by temperature, which is an important factor considering bubble emissions, mainly in shallow environments with lower hydrostatic pressure [11] [12]. In addition, recent estimates of the global number of lakes [13] indicate the great importance of small lakes for methane emission.…”