@article{fdi:010042794,
  title = {{A}naerobic decomposition of tropical soils and plant material : implication for the {CO}2 and {CH}4 budget of the {P}etit {S}aut {R}eservoir},
  author = {{G}u{\'e}rin, {F}. and {A}bril, {G}. and {J}unet de, {A}. and {B}onnet, {M}arie-{P}aule},
  editor = {},
  language = {{ENG}},
  abstract = {{T}ropical hydroelectric reservoirs contribute significantly to atmospheric {CH}4 and {CO}2 emissions. {T}o evaluate the contribution of the mineralization of the flooded soils and biomass to these atmospheric gas emissions, field and laboratory experiments were conducted. {C}ores were retrieved inform the littoral zone of the {P}etit {S}aut {R}eservoir ({F}rench {G}uiana), flooded 10 a prior to sampling, and different soils and plant material in the tropical forest {S}urrounding the reservoir. {A}ll the samples were flooded and incubated in anoxic conditions in the dark at 30 degrees {C}. {T}he potential {CH}4 and {CO}2 production rates were determined. {S}oils and plant material from the tropical forest were incubated over one year and the production measurements were performed at a frequency of 1-5 months. {M}ethane and {CO}2 production rates of soils and littoral sediments were linearly correlated to the {O}rganic {C} ({OC}) content of the slurries. {T}he slopes of the relationships were 2.6 x 10(2) +/- 5.6 x 10(1) nmol ({CH}4) g({OC}(dry))(-1) h(1) and 3.5 x 10(2) +/- 6.9 x 10(1) nmol ({CO}2) g({OC}(dry))(-1) h(-1). {F}or plant material, no relationship between the production rates and the {OC} content was found and on average over the year of incubation, production rates were 2.4 x 10(3) +/- 1 x 10(3) nmol ({CH}4) g({OC}(dry))(-1) h(-1) and 3.9 x 10(3) +/- 5 x 10(3) nmol ({CO}2) g({OC}(dry))(-1) h(-1), which is one order of magnitude higher than the mineralization of the soils and sediments. {E}xtrapolated at the scale of the {P}etit {S}aut {R}eservoir over 10 a, these results show that the mineralization of the soil and the plant biomass initially flooded {C}ontributed to 75-95% of the total {C} emissions to the atmosphere since the flooding of the reservoir. {M}ethane: {CO}2 molar ratios were 3 times higher for anaerobic decomposition than atmospheric emissions, quantitatively consistent with aerobic {CH}4 oxidation.},
  keywords = {},
  booktitle = {},
  journal = {{A}pplied {G}eochemistry},
  volume = {23},
  numero = {8},
  pages = {2272--2283},
  ISSN = {0883-2927},
  year = {2008},
  DOI = {10.1016/j.apgeochem.2008.04.001},
  URL = {https://www.documentation.ird.fr/hor/fdi:010042794},
}