猪粪与沼气渣对双季稻田甲烷排放的影响

随着环境温度的升高，稻田甲烷排放通量增加。早稻期间甲烷排放通量随着水稻生育期的增加而逐步加快，而晚稻甲烷排放主要集中在水稻生长的前中期，而且排放量很高。一天中甲烷排放具有很强的周期性，在6：00～8：00时，甲烷排放通量进入谷底，14：00时甲烷排放通量达到峰值。稻田甲烷排放通量与土壤5cm处的温度及土壤水溶解甲烷含量具有较高的相关性。猪粪和沼气渣的施用分别提高稻田甲烷排放量22．14％和4．40％。在早稻期间，施用猪粪和沼气渣分别提高土壤水溶解甲烷含量40．3％和11．9％，而晚稻期间仅分别提高23．9％和5．04％。

Impacts of application of pig manure and biogas sludge on methane emissions in the double-cropping ricefields

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.