河口红树林湿地CH4通量的日变化研究
Diurnal change of CH4 fluxes from esturine mangrove wetlands
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摘要: 甲烷(CH4)是大气中除CO2外最为丰富的含碳组分,其浓度以每年0.7%-1.1%的速率递增[1,2].尽管大气CH4含量仅为CO2的二百分之一,但却对预计的全球变暖约有20%的贡献率,而CO2的贡献率约为50%[3,4],由这些数据推算得一个分子的CH4比一个分子的CO2(目前最重要的温室气体)的增暖潜值高约80倍.很多研究者对全球大气CH4的预算结果均表明,湿地是大气CH4最重要的生物源[5,6],约占全球CH4源的40%~50%[7].湿地CH4通量的日变化研究是正确估算大时间尺度下CH4排放量(如平均年排放量和季节排放量)的基础,因而具有相当的重要性.
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Key words:
- Mangrove wetland /
- CH4 flux /
- diurnal change
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