【摘要】 为揭示天然湿地与稻田甲烷排放特征的差异,采用静态箱法对闽江河口天然湿地和稻田甲烷排放特征进行了比较,并探讨了水旱轮作的甲烷减排模式。结果表明:早稻田平均甲烷排放量为17.03 mg/m2.h,高于相应季节的天然芦苇沼泽甲烷排放量(7.47 mg/m2.h);天然湿地和稻田土壤理化特征差异是导致甲烷排放量不同的主要原因;早稻田甲烷排放量日变化主要受温度影响,而潮汐是影响天然芦苇沼泽的关键因素;水旱轮作可有效降低稻田甲烷排放。更多还原

【Abstract】 To clarify the methane emission difference between nature wetland and paddy field,the methane emission was measured in natural wetland and paddy field in Minjiang River estuary,at the same time,waterlogged and dry rotation methane reduction strategy was also discussed.The results showed that averaged methane emission was 17.03 mg/m2·h in early paddy field,which was higher than natural Phragmite australis marsh(7.47 mg/m2·h).Soil properties difference was the main reason for methane emission difference for nature wetland and paddy field.Temperature was the key factor controlling early paddy field diel methane emission and natural Phragmite australis marsh was influenced by tide.Waterlogged and dry rotation could effectively reduce paddy field methane emission.更多还原