Regularity and estimation of methane emission from marshland in the sanjiang plain

摘要

The regularity of CH_4 emission from marshland in the Sanjiang Plain was studied by sampling in the open field and analyzing under laboratory condition, the annual emission amount is al- so estimated. By Grey Relatively Analysis we know that the soil temperature in the 10-cm depth of grass-root layer is close related with CH_4 emission. CH_4 emission has different kinds of diurnal emis- sion modes:befor-dawn maximum mode, night maximum mode and irregular fluctuation mode. The seasonal variation trend of CH_4 emission rates is going up steadily from May to August and dropping down from September, the maximum lies behind the maximum of temperature.