Methane emission from aquatic ecosystems of Mexico City
Methane emission from aquatic ecosystems of Mexico City
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DOI：
10.1007/s00027-016-0487-y
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发表时间：
2017-01-01
期刊：
影响因子：
2.4
通讯作者：
Thalasso, Frederic
中科院分区：
文献类型：
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作者：
Martinez-Cruz, Karla;Gonzalez-Valencia, Rodrigo;Thalasso, Frederic
墨西哥城是一个大城市，有880万居民。这种人口密度，再加上糟糕的废水管理，导致水生生态系统接收大量废水，这可能会促进甲烷(CH4)的排放。我们对墨西哥城11个水生生态系统的水质和CH4排放进行了一年的测量，这些水生生态系统包括水库、河流、湖泊、运河和浅水湖泊漂浮花园系统。水生生态系统的甲烷总排放量为3679毫克甲烷年(-1)，占墨西哥城年甲烷排放量的3.5%。主要贡献者是Chinampas(33%)，其次是湖泊(27%)、水库(19%)、河流(12%)和运河(9%)。水质指标与CH4排放量呈正相关，因此，未经处理的废水排放量的减少可能会导致墨西哥城在经历了沉积物有机含量将被降解的过渡期后，温室气体足迹显著减少。
Mexico City is a large city, populated by 8.8 million inhabitants. This population density, combined with poor wastewater management, results in aquatic ecosystems receiving a large volume of wastewater which may promote methane (CH4) emission. We measured water quality and CH4 emission from 11 aquatic ecosystems in Mexico City during 1 year, including reservoirs, rivers, lakes, canals and chinampas (system of floating garden on shallow lakes). The total CH4 emission from aquatic ecosystems was estimated as 3679 Mg CH4 year(-1), which represents 3.5 % of the annual CH4 emission of Mexico City. The main contributors are chinampas (33 %), followed by lakes (27 %), reservoirs (19 %), rivers (12 %) and canals (9 %). Water quality indicators were positively correlated with CH4 emission, therefore a decrease in untreated wastewater discharge may result in a significant reduction of the greenhouse gas footprint of Mexico City, after a transitional period during which the organic content of the sediment would be degraded.