Study On Ch₄ And Co₂ Emissions Of Phragmites Australis Marsh In Minjiang Estuary Area

The Minjiang river estuary marsh is one of the most representative esturay marsh in southeast of China. This article mainly studied CH4 and CO2 emissions of Phragmites australis marsh in the Shanyutan wetland. The CH4 and CO2 emissions and environment influencing factors were be monitored by using the closed black chamber-gas chromatograph techques. The relationship between environmental influencing factors and the CH4 emissions were discussed. The results indicated:(1).The CH4 emissions were 43.405g·m-2·yr-1, and the CO2 emissions were 4728.112g·m-2·yr-1 in 2008;The CH4 emissions were 40.761g·m-2·yr-1, and the CO2 emissions were 4348.233g·m-2·yr-1 in 2009;(2).The CH4 emissions of the Phragmites australis marsh were separated into three periods that is before flood tide, in the period of flood and ebb and after ebb.The average emissions were 6.929 mg·m-2·h-1,2.163 mg·m-2·h-1 and 5.209 mg·m-2·h-1 in 2008,which were7.126 mg·m-2·h-1,2.006 mg·m-2·h-1 and 4.222 mg·m-2·h-1 in 2009;(3).The CO2 emissions of the Phragmites australis marsh were separated into three periods that is before flood tide, in the period of flood and ebb and after ebb.The average emissions were 544.901 mg·m-2·h-1,437.124 mg·m-2·h-1 and 609.023 mg·m-2·h-1 in 2008,and which were 626.663 mg·m-2·h-1 254.525 mg·m-2·h-1 and 555.751 mg·m-2·h-1 in 2009;(4).The CH4 emissions has significant positive ralationships with the the CO2 emissions in the Phragmites australis marsh;(5).The CH4 and CO2 emissions in the summer and autum were higher than in the winter and spring;(6).The temperature is the most significant factor of which effect the CH4 and CO2 overall tendency, but the height of tide cannot be ignored.