关键词: 温室气体通量, 水-气界面, CH4和CO2, 求索溪, 宜昌市

Abstract:

To investigate the emission law of greenhouse gas in small water body, by using LGR- floating static flux chamber method, a 24-hour field continuous observation was carried out to quantify the CH4 and CO2 fluxes across the water-air interface of Qiusuo River in China Three Gorges University at Yichang. The observed results showed that CH4 and CO2 are positively correlated, both of which emitted all day. Moreover, the correlation analysis indicated that CO2 flux had a significant positive correlation with water temperature and air-pressure, but a negative correlation with temperature, pH, dissolved oxygen and chlorophyll a; CH4 flux had a positive correlation with air-pressure and negative correlation with other factors; CH4 and CO2 fluxes at 10:00 and 21:00 are close to the average values of a day, so this period can be referred as sampling time for a single measurement.

Key words: greenhouse gases flux, water-air interface, influential factors, Qiusuo River, Yichang City