不同稻秆处理方式下双季稻温室气体排放通量研究

Greenhouse gases emission from paddy fields under different rice straw treatments

通过田间试验研究了不同稻秆处理方式下(常规处理(移出稻田+NPK),直接还田(RS)+NPK,原位焚烧还田(BIS)+NPK)双季稻温室气体排放.结果表明,相对于常规处理,RS+NPK处理显著增加CH4排放与减少N2O排放,BIS+NPK处理降低水稻生长季稻田CH4;RS+NPK和BIS+NPK处理稻田N2O排放差异并不显著(P>0.05);早、晚稻秸秆焚烧过程中产生的CH4与焚烧处理田间CH4排放相当,焚烧过程产生的N2O分别为BIS+NPK处理早、晚稻生长季N2O排放总量的90.1%和53.4%,贡献极大.不同处理温室效应表现为RS+NPK>NPK>BIS+NPK,单位产量的温室效应表现为秸秆直接还田处理最高,秸秆原位焚烧处理最低.

A field experiment was conducted in double rice area to figure out the influence of different rice straw treatments(rice straw removing +NPK,rice straw incorporated into the soil(RS)+NPK,rice straw burned in situ(BIS)+NPK) on the greenhouse gases emission from paddy fields.The results showed that RS+NPK treatment increased the CH4 emission and decreased the N2O emission significantly compared with NPK treatment,while BIS+NPK treatment reduced CH4 and N2O emission during the double rice growing season.N2O emission of RS+NPK and BIS+NPK treatments had no significant difference.CH4 emission from burning activity was equivalent to that from rice field,while N2O emission accounted for a great proportion of total N2O emission during the growing period,90.1% and 53.4%,respectively.The total GHG emission of different treatment is RS+NPK>NPK>BIS+NPK.A similar order was found for emission intensity(CO2 e/t grain yield).