Exploring correlation between redox potential and other edaphic factors in field and laboratory conditions in relation to methane efflux

摘要

Methane is primarily a biogenic gas, which is implicated in global warming. Although its production in the anoxic conditions is regulated by several edaphic factors, aquatic macrophytes also influence methane emission by providing aerenchyma to act as chimney for CH_4 transport from the sediment to troposphere, by releasing root exudates to the sediment to serve as substrate for methanogenic bacteria and by transporting atmospheric O_2 to rhizosphere, which stimulates CH_4 consumption. Among the edaphic factors, redox potential (Eh) is the most important. Which largely determines the action of methanogenic bacteria.