亚热带浅水池塘水-气界面甲烷通量特征  

Characteristics of Methane Flux Across the Water-air Interface in Subtropical Shallow Ponds

作　　者：龙丽[1] 肖尚斌[1] 张成[2,3] 张文丽[4] 谢恒[4] 李迎晨[1] 雷丹[1] 穆晓辉[1] 张军伟[1] 

机构地区：[1]三峡大学水利与环境学院,宜昌443002 [2]三峡大学电气与新能源学院,宜昌443002 [3]中国地质大学(武汉)资源学院,武汉430074 [4]三峡大学生物与制药学院,宜昌443002

出　　处：《环境科学》2016年第12期4552-4559,共8页Environmental Science

基　　金：国家自然科学基金项目(41273110);湖北省自然科学基金项目(2014CFB672);2015年三峡大学研究生科研创新基金项目(2015CX009);湖北省教育厅科研计划项目(Q20151209);湖北省自然基金指导性计划项目(2015CFC834)

摘　　要：为研究亚热带富营养化浅水池塘水-气界面CH_4释放通量特征,以宜昌地区5个浅水池塘为对象,利用静态通量箱法进行了为期一年的水-气界面CH_4通量监测.结果表明,这5个池塘CH_4的年释放量分别为4.495、12.702、6.827、8.920、17.560 mg·(m^2·h)^(-1).其中扩散通量分别为0.075、0.087、0.118、0.086、0.151 mg·(m^2·h)^(-1),冒泡通量分别为4.420、12.616、6.709、8.834、17.409 mg·(m^2·h)^(-1),CH_4冒泡量占CH_4释放总量的98%以上,并且CH_4释放量明显高于其他水域生态系统(湖泊、水库).可见在富营养化浅水水域中,CH_4释放量较大,且冒泡排放是CH_4的主要排放方式,而只关注扩散排放而忽略冒泡排放则会大大低估CH_4释放量.Five shallow ponds of Yichang were selected to illustrate the characteristics of methane（ CH4） in subtropical eutrophic shallow ponds. CH4 flux across the water-air interface was quantified with static floating chamber method for one year. Annual CH4 fluxes of the five ponds were 4. 495,12. 702,6. 827,8. 920,17. 560 mg·（ m^2·h）^-1respectively. Diffusive CH4 fluxes were 0. 075,0. 087,0. 118,0. 086,0. 151 mg·（ m^2·h）^-1respectively and bubble emissions were 4. 420,12. 616,6. 709,8. 834,17. 409mg·（ m^2·h）^-1respectively. Over 98% of total CH4 flux was bubble emission and CH4 flux was apparently higher than other aquatic ecosystems. So the CH4 flux of shallow waters was high and bubble emission was the dominant way. CH4 emission would be largely underestimated if the research only focus on the diffusion discharge and ignore the bubble emission.

关 键 词：水-气界面 甲烷 扩散排放 冒泡排放 通量 浅水池塘 

分 类 号：X144[环境科学与工程—环境科学]