2018
DOI: 10.1038/s41467-018-03607-z
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Methane stimulates massive nitrogen loss from freshwater reservoirs in India

Abstract: The fate of the enormous amount of reactive nitrogen released to the environment by human activities in India is unknown. Here we show occurrence of seasonal stratification and generally low concentrations of dissolved inorganic combined nitrogen, and high molecular nitrogen (N2) to argon ratio, thus suggesting seasonal loss to N2 in anoxic hypolimnia of several dam-reservoirs. However, 15N-experiments yielded low rates of denitrification, anaerobic ammonium oxidation and dissimilatory nitrate reduction to amm… Show more

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Cited by 64 publications
(50 citation statements)
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“…Dissolved CH4 concentration declines at the oxycline level, where the highest rates of CH4 oxidation are usually measured (Oswald et al, 2015(Oswald et al, , 2016. The CH4 profiles in this group were similar to the ones found in tropical eutrophic and temperate reservoirs (Naqvi et al, 2018;West et al, 2016). The second profile type presents a small peak of metalimnetic CH4, concomitant with peaks of dissolved oxygen, chlorophyll-a, photosynthetic picoeukaryotes, and cyanobacteria ( Fig.…”
Section: Profiles Descriptionsupporting
confidence: 73%
See 1 more Smart Citation
“…Dissolved CH4 concentration declines at the oxycline level, where the highest rates of CH4 oxidation are usually measured (Oswald et al, 2015(Oswald et al, , 2016. The CH4 profiles in this group were similar to the ones found in tropical eutrophic and temperate reservoirs (Naqvi et al, 2018;West et al, 2016). The second profile type presents a small peak of metalimnetic CH4, concomitant with peaks of dissolved oxygen, chlorophyll-a, photosynthetic picoeukaryotes, and cyanobacteria ( Fig.…”
Section: Profiles Descriptionsupporting
confidence: 73%
“…The wide range in CH4 concentrations found in this study covers from values found in boreal lakes (Donis et al, 2017;Grossart et al, 2011;Murase et al, 2003;Tang et al, 2014), temperate lakes (West et al, 2016), to those found in tropical reservoirs (Naqvi et al, 2018;Okuku et al, 2019). In surface waters, we found values from 0.06 to 8.18 µM, which is about three times the minimum values and eighty times the maximum values found in the surface waters of Lake Kivu (Africa) by Roland et al, (2017).…”
Section: Profiles Descriptionsupporting
confidence: 59%
“…Methane is abundantly formed in anaerobic lake sediments by methanogenesis (Borrel et al, 2011;Conrad et al, 2007;Norði et al, 2013) and diffuses upwards through the water column toward the oxycline of often nitrate-containing seasonally stratified lakes. With the discovery of the anaerobic oxidation of methane (AOM) coupled to nitrate or nitrite reduction more than 10 years ago a new process was suggested that has the potential to reduce emissions of greenhouse gases of lacustrine environments by oxidizing CH 4 to CO 2 under anoxic conditions (Ettwig et al, 2010;Haroon et al, 2013;Raghoebarsing et al, 2006).…”
Section: Introductionmentioning
confidence: 99%
“…The recent synthesis by Deemer et al () included flux measurements from 161 reservoirs for CH 4 , 229 for CO 2 , and just 58 for N 2 O. Tropical (Guerin et al, ; Naqvi et al, ), subtropical (Chen, Yuan, et al, ; Yuan, et al, ; Li et al, ; Zhao et al, ; Zhu et al, ), temperate (Beaulieu et al, ; Deemer et al, ; Li et al, ; Tomaszek & Czerwieniec, ), and boreal (Huttunen et al, ) reservoirs that have been measured indicate that they are also sources for N 2 O. N 2 O has 298 times the global warming potential of CO 2 on a per molar basis in the atmosphere over a 100‐year time scale, making it an important addition to measurements of reservoir greenhouse gas emissions (IPCC, ; Myhre et al, ).…”
Section: Introductionmentioning
confidence: 99%