摘要
针对寒地水稻秸秆还田,采用定位小区连续定位观测方法,研究寒地稻田甲烷排放规律,探讨水稻秸秆还田和温度对甲烷排放影响,估算水稻生长季甲烷排放量。结果表明,水稻田甲烷排放通量呈双峰变化趋势;不还田(SR0)处理甲烷排放通量与气温显著相关,与土壤温度相关不显著,低量还田(SR1)、高量还田(SR2)处理甲烷排放通量与地表温度、5、10 cm土层温度极显著相关,与气温相关不显著;不还田(SR0)、低量还田(SR1)和高量还田(SR2)的甲烷排放通量最大值和平均值与秸秆还田量拟合方程分别为y=0.519x+0.585(R2=0.999),y=0.192x+0.350(R2=0.999),相关性显著,甲烷排放量与秸秆还田量拟合方程为y=5.055x+9.168(R2=0.999),相关性显著,甲烷排放通量和甲烷排放量随秸秆还田量增加而升高。
A large amount of rice straw was produced along with the increasing rice area, reasonable rice straw retention resolved the remaining issues, but it increased methane emission in rice field. This experiment was investigated based on continuous observation information in location plots, studied the law of methane emission and the effects of rice straw application and temperature on methane emission in cold rice region, and estimated total CH4 emission during the cropping season. The results showed that the methane emission rates trend showed double peaks. In the straw removal （So） treatment, methane emission rates were significant correlation with air temperature and not significant correlation with soil temperature. In the high amount of straw retention （S=） and low amount of straw retention （S,） treatment, methane emission rates were highly significant correlation with the temperature of soil surface, and at 5, 10 cm depth, but not significant correlation with air temperature. The fitted equations of methane emission rates maximum and average values, and straw retention amount were ）,=0.519x＋0.585 （R2=0.999）, y=0.192x＋0.350 （R^2=0.999）, significant correlation. The fitted equation of total methane emission and straw retention amount was y=5.055x＋ 9.168 （R^2=0.999）,significant correlation. The methane emission rates and total methane emission were increased as the increasing amount of rice straw retention.
出处
《东北农业大学学报》
CAS
CSCD
北大核心
2015年第12期8-15,共8页
Journal of Northeast Agricultural University
基金
国家科技支撑计划项目(2012BAD14B06)
关键词
寒地稻田
水稻秸秆还田
甲烷排放
温度
rice field in cold region
rice straw retention
methane emission
temperature
