| 地膜覆盖对稻-油轮作农田温室气体排放的影响 |
| 摘要点击 1725 全文点击 519 投稿时间：2019-01-04 修订日期：2019-04-14 |
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| 中文关键词 稻-油轮作 地膜覆盖 温室气体 排放通量 全球增温潜势(GWP) |
| 英文关键词 rice-rapeseed rotation plastic film mulching greenhouse gas flux global warming potential (GWP) |
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| 中文摘要 |
| 以位于西南大学农业部重庆紫色土生态环境重点野外科学观测试验站内的稻-油轮作为研究对象，采用静态箱/气相色谱法，对覆膜和对照（不覆膜）处理下稻油轮作CO2、CH4和N2O排放特征进行了为期1 a的原位观测.结果表明，稻-油轮作农田CO2、CH4和N2O排放通量均呈现出明显的季节变化，且2种处理下这3种温室气体的季节变化模式相似.覆膜处理下稻-油轮作农田全年CH4排放量为（46.14±13.40）kg·hm-2，相比于对照处理下的（18.61±2.05）kg·hm-2，提高了147.93%（P<0.05），但覆膜对CO2和N2O的排放影响并不显著，覆膜及对照处理下CO2年排放量分别是（-47.54±2.11）t·hm-2和（-47.60±2.19）t·hm-2，N2O年排放量分别是（18.94±4.74）kg·hm-2和（23.14±3.68）kg·hm-2.覆膜和对照处理下GWP值分别为-41.16t·hm-2和-40.95t·hm-2，表现为大气温室气体的吸收汇，但差异并不显著. |
| 英文摘要 |
| A field experiment was conducted at the Key Field Station for Monitoring of Eco-Environment of Purple Soil of the Ministry of Agriculture of China at the farm of Southwest University in Chongqing. In the study, static chamber and gas chromatography methods were used to study the effects of plastic film mulching treatment on CO2, CH4, and N2O emissions from rice-rapeseed rotation in situ for one year. A control experiment was also conducted without using the film. The CO2, CH4, and N2O emission fluxes of the rotation showed obvious seasonal changes, and the seasonal variation patterns of these three greenhouse gases were similar under the two treatments. The CH4 emission of the rotation under the plastic film mulching treatment was (46.14±13.40) kg·hm-2, or 147.93% (P<0.05), compared with (18.61±2.05) kg·hm-2 for the control. However, the impact of plastic film mulching on CO2 and N2O emissions was not significant. The annual CO2 emissions under the plastic film treatment and the control were (-47.54±2.11) t·hm-2 and (-47.60±2.19) t·hm-2, respectively, and the annual emissions of N2O were (18.94±4.74) kg·hm-2 and (23.14±3.68) kg·hm-2, respectively. The rice-rapeseed rotation in the two experiments showed absorption and sinking of atmospheric greenhouse gases, although the difference was not significant. The global warming potential (GWP) values with the plastic film treatment and the control were -41.16 t·hm-2 and -40.95 t·hm-2, respectively. |
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