High rates of methane oxidation in an Amazon floodplain lake

被引：33

作者：

Barbosa, Pedro M. ^{[1
,2
]}

Farjalla, Vinicius F. ^{[1
,3
]}

Melack, John M. ^{[4
]}

Amaral, Joao Henrique F. ^{[5
]}

da Silva, Jonismar S. ^{[5
]}

Forsberg, Bruce R. ^{[5
]}

机构：

[1] Univ Fed Rio de Janeiro, Inst Biol, Dept Ecol, Rio De Janeiro, RJ, Brazil

[2] Univ Fed Rio de Janeiro, Programa Posgrad Ecol, Rio De Janeiro, RJ, Brazil

[3] Lab Int Cambio Global LINCGlobal, Rio De Janeiro, Brazil

[4] Univ Calif Santa Barbara, Bren Sch Environm Sci & Management, Santa Barbara, CA 93106 USA

[5] Natl Inst Amazon Res INPA, Environm Dynam Dept, Manaus, Amazonas, Brazil

来源：

BIOGEOCHEMISTRY | 2018年 / 137卷 / 03期

基金：

美国国家航空航天局;

关键词：

Methane oxidation; Floodplain lake; Methane emission; Carbon isotope fractionation; Amazon floodplain; C-13 ISOTOPE FRACTIONATION; DISSOLVED METHANE; WATER COLUMN; CARBON; EMISSIONS; ENVIRONMENTS; TRANSPORT; SEDIMENT; DYNAMICS; WETLANDS;

D O I：

10.1007/s10533-018-0425-2

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Methane (CH4) oxidation may consume large amounts of dissolved CH4 in lakes and wetlands. Here, we estimated CH4 oxidation rates in an Amazonian floodplain lake during periods representative of the annual variations in water level, using incubations and measurements of delta C-13-CH4. A large fraction of the CH4 produced was oxidized (from 34 to 100%, average = 80%), with volumetric CH4 oxidation rates ranging from 1 to 132 mg C m(-3) d(-1). Heavier values of delta C-13-CH4 in surface waters when compared to bottom waters and sediment bubbles corroborates the high CH4 oxidation rates observed. The depth-integrated oxidation rates were of the same magnitude as the calculate CH4 evasion to the atmosphere, which indicates that methane oxidation is an important sink of CH4 and is likely to be important in the many similar lakes encountered in the Amazon River basin.

引用

页码：351 / 365

页数：15

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