@article{fdi:010074776,
  title = {{S}edimentary and elemental dynamics as a function of the elevation profile in a semi-arid mangrove toposequence},
  author = {{B}ourgeois, {C}. and {A}lfaro, {A}. {C}. and {L}eopold, {A}. and {A}ndreoli, {R}. and {B}isson, {E}. and {D}esnues, {A}nne and {D}uprey, {J}ean-{L}ouis and {M}archand, {C}yril},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he effect of elevation and seasonal variations on the elemental status of sediments was investigated along a semi-arid mangrove profile in the {H}eart of {V}oh, {N}ew {C}aledonia. {A}s other mangroves in the world, this mangrove site experienced an increase of tidal range that led to the recent colonisation of salt flats at the highest elevations landward by {A}vicetuda marina ({F}orsk.) {V}ierh subsp. australasica ({W}alp.) {J}. {E}verett. {T}his young {A}vicennia stand was compared with an old {A}vicennia stand at lower elevations on its edge. {D}own the elevation profile, the sediment properties of a short {R}hizophora stylosa {G}riff stand were compared with a taller {R}hizophora stand seaward that experienced longer immersion periods. {O}ur results show that centimetre-scale variation in elevation significantly affects all sediment properties along the semi-arid profile and induces a strong seasonal variation in reduction potential and p{H} at high elevations over the year. {W}e suggest that during the dry season, the oxygenated sediments enhanced the oxidation of organic matter ({OM}), which led to the dissolution of {F}e-{S} compounds and the subsequent acidification of the sediments. {T}his in turn induced a loss of metal content ({F}e, {C}u {N}i, {M}n) compared to the sediments at lower elevation. {M}oreover, our results show that the accumulation of {OM} during the colonisation phase by {A}vicennia coincided with higher water content and higher total and exchangeable concentrations of {N}, {P}, {M}g and {K} within the surface sediments than in the old {A}vicennict stand. {T}he tall {R}hizophora stand at the borders of the channel was characterized by an increase in elevation, denser sediments and a depletion of elements in several horizons of the depth profile compared to the short {R}hizophora landward. {T}hese results provide a better understanding of i) the impact of elevation differences on major and minor elements in a semi-arid mangrove ecosystem, and ii) the changes of sediment properties mediated by a pioneer species within the early phase of succession in hypersaline mangroves.},
  keywords = {{S}emi-arid mangroves ; {T}opography ; {B}iogeochemistry ; {S}easonal variations ; {L}andward migration ; {ZONE} {SEMIARIDE}},
  booktitle = {},
  journal = {{C}atena},
  volume = {173},
  numero = {},
  pages = {289--301},
  ISSN = {0341-8162},
  year = {2019},
  DOI = {10.1016/j.catena.2018.10.025},
  URL = {https://www.documentation.ird.fr/hor/fdi:010074776},
}