Methane Emission from Aquatic Vegetation Zones of Wuliangsu Lake, Inner Mongolia
乌梁素海湖泊湿地植物区甲烷排放规律

To quantify the variations of methane fluxes from different vegetation zones, Two-year measurements were measured at different vegetation zones and water depths using static chamber technique during a growing season from April to October in 2003 and 2004. Results showed that the average emission flux of CH4 from Potamogeton pectinatus (submerged macrophyte) growing zones was 3.44±1.60 mg?(m2? h)-1, 78.06% lower than that from Phragmites australis (emergent macrophyte). Significant seasonal and diurnal variations of CH4 emission were observed for Phragmites community; however, the variations were minor for P. pectinatus. Sediment temperature at 5cm and light intensity were important factors influencing seasonal and diurnal variations of CH4 fluxes from Phragmites zone. Annual methane flux from the lake was1024.6t and 1156.7t in 2003 and 2004, respectively.