@article{fdi:010063600,
  title = {{H}olocene paleohydrology of {Q}uistococha {L}ake ({P}eru) in the upper {A}mazon {B}asin : influence on carbon accumulation},
  author = {{A}niceto, {K}. and {M}oreira {T}urcq, {P}atricia and {C}ordeiro, {R}. {C}. and {F}raizy, {P}ascal and {Q}uintana, {I}. and {T}urcq, {B}runo},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n order to study the impact of hydrological changes of the {A}mazon {R}iver on sedimentation process and organic matter ({OM}) accumulation, in an {A}mazonian floodplain lake during the {H}olocene, three sediment cores were collected from {Q}uistococha {L}ake, {P}eru. {T}he cores were dated with {C}-14 accelerator mass spectrometry ({AMS}), radiographed, and described. {B}ulk density, granulometry, loss on ignition ({LOI}), total organic carbon ({TOC}) and total nitrogen ({TN}) contents were measured, and stable isotopic composition of {TOC} (delta {C}-13) and {TN} (delta {N}-15) and carbon accumulation rates were determined. {T}wo distinctive sedimentary depositional phases were identified based on the lithology, granulometry and the geochemical characteristics of sedimentary {OM}. {B}etween about 6100 and 4900 cal years {BP}, the lake was under strong influence of the {A}mazon {R}iver. {T}he river induced highest sedimentation rates (mean 0.5 cm yr(-1)), a predominant deposition of relatively coarse particles (coarse silt), low {LOI} (1%), low contents of organic carbon (0.5%), low {C}/{N} ratios (similar to 10), relatively low delta {C}-13 values (-26.0 parts per thousand), very laminated sediments and high carbon accumulation rates between 14 and 29 g {C} m(-2) yr(-1). {A} gap in the record between about 4900 and 2600 cal years {BP} corresponds to a sedimentation hiatus during the dry mid {H}olocene. {T}his gap is probably due to an avulsion of the main stem that induced significant changes in the lacustrine sedimentation. {A}fter 2600 cal years {BP}, sedimentation resumed but now the lake was isolated far from the {A}mazon influence. {T}he resumption of sedimentation corresponds to wetter conditions during the late {H}olocene and an increase in water levels. {T}he lake was now characterized by very low sedimentation rates (0.02 cm yr(-1)), fine organic-rich sediments with high {LOI} (between 20 and 80%), {TOC} (between 10 and 40% of {TOC}), high {C}/{N} ratio (20), and lower delta {C}-13 and delta {N}-15 indicating a predominant deposition of {C}-3-plant derived {OM}. {C}arbon accumulation in this sedimentary depositional phase was about 8 g {C} m(-2) yr(-1). {T}hese results, combined with those of studies from other isolated lakes ({C}ordeiro et al., 1997,2008; {T}urcq et al., 2002) and from other floodplain lakes ({M}oreira et al., 2012; {M}oreira et al., 2013), point out that floodplain lakes with strong influences from the {A}mazon {R}iver act as important carbon sinks in the {A}mazon {B}asin despite their low carbon concentrations.},
  keywords = {{P}aleohydrology ; {A}mazon {R}iver ; {C}arbon accumulation ; {O}rganic matter ; {F}loodplain lake ; {A}vulsion ; {PEROU} ; {AMAZONE} {BASSIN}},
  booktitle = {},
  journal = {{P}alaeogeography {P}alaeoclimatology {P}alaeoecology},
  volume = {415},
  numero = {{SI}},
  pages = {165--174},
  ISSN = {0031-0182},
  year = {2014},
  DOI = {10.1016/j.palaeo.2014.08.018},
  URL = {https://www.documentation.ird.fr/hor/fdi:010063600},
}