科研之友
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摘要
CH4 is an important greenhouse gas in the atmosphere, which plays an important role in global climate change. Some preliminary studies suggest that reservoirs are potentially significant contributors to global CH4 emissions, and therefore there are increasing concerns about CH4 emissions from reservoirs in recent decades. To explore the spatiotemporal variations and influence factors of dissolved CH4 in subtropical coastal reservoirs, we conducted high-resolution sampling of dissolved CH4 and related hydrographical parameters in the surface water in Wenwusha Reservoir in southeastern China in November 2018 (Autumn), March 2019 (Spring) and June 2019 (Summer). Our results showed that the dissolved CH4 concentrations of the surface water of Wenwusha Reservoir during the study period changed in the range of 0.03~27.35 μmol·L-1. Temporally, the mean dissolved CH4 concentrations in spring and summer were significantly higher than those in the autumn (p<0.01). Spatially, the dissolved CH4 concentrations in the zone with sewage loading and river input were higher than those in the other zones. Furthermore, the dissolved CH4 concentrations decreased along a gradient from the littoral area to the central area of the reservoir. The Spearman correlation analysis showed that the CH4 concentrations in surface water of the reservoir was positively correlated with water temperature (p<0.05) and DOC (p<0.01), and negatively correlated with salinity and dissolved oxygen (p<0.01). Our findings confirm that subtropical reservoirs are important CH4 sources and sewage input from the catchment and other factors influence CH4 emissions.
