FN Archimer Export Format
PT J
TI The dynamics of phosphorus in turbid estuarine systems: Example of the Gironde estuary (France)
BT 
AF DEBORDE, Jonathan
   ANSCHUTZ, Pierre
   CHAILLOU, Gwenaelle
   ETCHEBER, Henri
   COMMARIEU, Marc-Vincent
   LECROART, Pascal
   ABRIL, Gwenael
AS 1:1;2:1;3:1;4:1;5:1;6:1;7:1;
FF 1:;2:;3:;4:;5:;6:;7:;
C1 Univ Bordeaux 1, UMR EPOC 5805, CNRS, F-33405 Talence, France.
C2 UNIV BORDEAUX, FRANCE
IF 3.277
TC 57
UR https://archimer.ifremer.fr/doc/00603/71538/69943.pdf
LA English
DT Article
CR GIROX 3
   GIROX 4
   SOGIR
BO Cote D'Aquitaine
AB Suspended particles and surface waters were collected in the Gironde estuary (southwestern France) along the salinity gradient. Dissolved inorganic phosphorus (DIP) was analyzed in the filtered surface waters. The suspended particles were sequentially leached to determine five fractions of phosphorus: exchangeable or loosely sorbed P, reactive Fe-bound P, refractory Fe oxide-bound P, P associated with apatite and carbonates, and organic P. Experiments were conducted to determine the effects of temperature, salinity, and DIP concentration on phosphorus sorption/desorption processes. The concentration and distribution of particulate phosphorus was homogeneous along the salinity gradient of the estuary, whereas it was variable in time and space in the freshwater part. DIP showed a rapid desorption of loosely sorbed P at low salinities. Desorption depended on suspended particle concentration, but not on DIP concentration. At high suspended particle concentrations, some exchangeable P remained linked to particles, until suspended particle concentration decreased downstream of the estuary. This delayed desorption of bioavailable P occurs in waters in which the penetration of light is sufficient to support photosynthesis and probably plays a major role in primary production at high salinities. Mineralization of organic phosphorus also releases available phosphorus, but this process is slow relative to the water residence time in the estuary. The budget of DIP, the loss of particulate P from the organic fraction, and the water residence time suggest that the dynamics of P in the Gironde estuary is well explained by the two processes of P release from particles to waters without P uptake. 
PY 2007
PD MAR
SO Limnology And Oceanography
SN 0024-3590
PU Amer Soc Limnology Oceanography
VL 52
IS 2
UT 000245145200034
BP 862
EP 872
DI 10.4319/lo.2007.52.2.0862
ID 71538
ER

EF