Abstract
To understand the mechanism for and effect of standing water depth on CH 4 emissions from freshwater marshes, we measured CH 4 emissions as well as labile organic C (LOC) and CH 4 concentration in porewater in situ in Sanjiang Plain of Northeast China. Average fluxes of CH 4 emissions from Carex lasiocarpa, Carex meyeriana and Deyeuxia angustifolia marshes were 35.6, 31.1 and 25.7 mg CH 4 m −2 h −1, respectively, during the 3-day measuring period in August 2001, increased as standing water depth incremented from 5 to 20 cm. Standing water depth determined the type of marsh plants, which governed CH 4 transport, and the amount of plant litters, which resulted in the difference in LOC for methanogenesis among marshes. LOC greatly affected CH 4 concentration and total amount of CH 4 in porewater, whereas the latter was significantly related with CH 4 emissions. The more aboveground plant biomass especially stem density accelerated CH 4 emission but was of less importance compared with the standing water among marshes.
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