Impacts of application of pig manure and biogas sludge on methane emissions in the double-cropping ricefields
猪粪与沼气渣对双季稻田甲烷排放的影响

With the increase of environmental temperature,the rate of methane emission is increased in ricefields.It is increased gradually with the processing of plant growing in the early rice.Most of methane is emitted with high rates during the early stage of plant growth in the late rice.The diel methane emission showed a regular pattern,with the valley at 6:00~8:00 and the peak at 14:00.This rate is closely related to both the soil temperature and the content of the water\|soluble methane at 5cm depth.The application of pig manure and biogas sludge is resulted in an increase of the methane emission rates by 22.14% and 4 40% respectively.The content of the water\|soluble methane in the soil is also increased by using pig manure and biogas sludge,by 40.3% and 11.9% respectively in the early rice,while it is 23.9% and 5.04% respectively in the late rice.