Methane emissions from Mexican freshwater bodies: correlations with water pollution
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- 作者：Rodrigo Gonzalez-Valencia (1)
Armando Sepulveda-Jauregui (1)
Karla Martinez-Cruz (1)
Jorge Hoyos-Santillan (1)
Luc Dendooven (2)
Frederic Thalasso (1) - 关键词：Eutrophication ; Methane emission ; Trophic state index ; Tropical lakes ; Water quality
- 刊名：Hydrobiologia
- 出版年：2014
- 出版时间：January 2014
- 年：2014
- 卷：721
- 期：1
- 页码：9-22
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- 作者单位：Rodrigo Gonzalez-Valencia (1)
Armando Sepulveda-Jauregui (1)
Karla Martinez-Cruz (1)
Jorge Hoyos-Santillan (1)
Luc Dendooven (2)
Frederic Thalasso (1)
1. Departamento de Biotecnolog y Bioingenier, Centro de Investigaci y de Estudios Avanzados del Instituto Politnico Nacional (Cinvestav-IPN), Av. IPN 2508, 07360, Mexico, DF, Mexico
2. Centro de Investigaci y de Estudios Avanzados del Instituto Politnico Nacional (Cinvestav-IPN), ABACUS, Av. IPN 2508, 07360, Mexico, DF, Mexico - ISSN：1573-5117
文摘
The literature concerning methane (CH4) emissions from temperate and boreal lakes is extensive, but emissions from tropical and subtropical lakes have been less documented. In particular, methane emissions from Mexican lakes, which are often polluted by anthropogenic carbon and nutrient inputs, have not been reported previously. In this work, methane emissions from six Mexican lakes were measured, covering a broad range of organic inputs, trophic states, and climatic conditions. Methane emissions ranged from 5 to 5,000mg CH4m2day1. Water samples from several depths in each lake were analyzed for correlation between water quality indicators and methane emissions. Trophic state and water quality indexes were most strongly correlated with methane fluxes. The global methane flux from Mexican freshwater lakes was estimated to be approximately 1.3 Tg CH4year1, which is about 20% of methane and 4.4% of total national greenhouse gas emissions. Data for untreated wastewater releases to the environment gave an emission factor of 0.19kg CH4kg1 of Biochemical Oxygen Demand, which is superior to that previously estimated by the IPCC for lake discharges. Thus, the large volume of untreated wastewater in Mexico implies higher methane emission than previously estimated.