The Contribution Of Kandelia Candel To Ecosystem Methane Emissions In A Subtropiacal Mangrove Of The Min River Estuary

Wetland is the largest natural source of methane production.The methane transmission from wetland plants is an important way for methane emission in wetlands.Therefore,it is an important link of understanding and clarifying the mechanism of the methane transmission in plants to understand and regulate the methane emission in wetlands.In this paper,we have determined the methane fluxes from the branches and leaves,plate-like roots,trunks of the Kandelia candels and the sediments-atmosphere interface in different seasons of the year from Dec,2016 to Nov,2017,in the Kandelia candel mangrove wetland ecosystem from Culu island of Minjiang Estuary.The results show that There is no methane transmission in the branches and leaves of the Kandelia candels,but the plate-like roots,trunks of the Kandelia candel have ability for transporting the methane,and The amount of methane transmission in summer and autumn were hihger than that in winter and spring;There was no significant difference in methane transmission between the two DBH diameter ranges（1.9-3.8 cm and 3.8-6.6cm）of the plate-like roots section of the Kandelia candel.and the methane transmission rate were decreased from bottom to top in the trunk section.The diameter of DBH has a certain effect on the CH₄ transmission capacity of Kandelia plants.The transmission capacity of Kandelia candel The contributions of methane transport to the whole mangrove wetland ecosystem from the Kandelia candels accounted for 26.99%～97.47%,averaged 66.87%.The plate roots（0～0.2 m）and the truck below 0.5 m are the major sections for methane transport that account for that contributed above 98%methane relative to the entire plant.Methane transport from the Kandelia candel community is the main pathway for methane emission in the mangrove ecosystem in subtropical estuaries,and temperature is the main factor for regulating the methane transport of the Kandelia candel.