TY - JOUR
T1 - Phosphorus speciation and availability in intertidal sediments of the Yangtze Estuary, China
AU - Hou, L. J.
AU - Liu, M.
AU - Yang, Y.
AU - Ou, D. N.
AU - Lin, X.
AU - Chen, H.
AU - Xu, S. Y.
PY - 2009/1
Y1 - 2009/1
N2 - In order to better understand P cycling and bioavailability in the intertidal system of the Yangtze Estuary, both surface (0-5 cm) and core (30 cm long) sediments were collected and sequentially extracted to analyze the solid-phase reservoirs of sedimentary P: loosely sorbed P; Fe-bound P; authigenic P; detrital P; and organic P. The total sedimentary P in surface and core sediments ranged from 14.58-36.81 μmol g-1 and 17.11-24.55 μmol g-1, respectively, and was dominated by inorganic P. The average percentage of each fraction of P in surface sediments followed the sequence: detrital P (54.9%) > Fe-bound P (23.7%) > organic P (14.3%) > authigenic P (6.3%) > loosely sorbed P (0.8%), whereas in core sediments it followed the sequence: detrital P (61.7%) > Fe-bound P (17.0%) > authigenic P (13.1%) > organic P (7.5%) > loosely sorbed P (0.7%). Post-depositional reorganization of P was observed in both surface and core sediments, converting organic P and Fe-bound P to authigenic P. The accumulation rates and burial efficiencies of the total P in the intertidal area ranged from 118.70-904.98 μmol cm-2 a-1 and 80.29-88.11%, respectively. High burial efficiency of the total P is likely related to the high percentage of detrital P and the high sediment accumulation rate. In addition, the bioavailable P represented a significant proportion of the sedimentary P pool, which on average accounted for 37.4% and 25.1% of the total P in surface and core sediments, respectively. This result indicates that the tidal sediment is a potential internal source of P for this P-limiting estuarine ecosystem.
AB - In order to better understand P cycling and bioavailability in the intertidal system of the Yangtze Estuary, both surface (0-5 cm) and core (30 cm long) sediments were collected and sequentially extracted to analyze the solid-phase reservoirs of sedimentary P: loosely sorbed P; Fe-bound P; authigenic P; detrital P; and organic P. The total sedimentary P in surface and core sediments ranged from 14.58-36.81 μmol g-1 and 17.11-24.55 μmol g-1, respectively, and was dominated by inorganic P. The average percentage of each fraction of P in surface sediments followed the sequence: detrital P (54.9%) > Fe-bound P (23.7%) > organic P (14.3%) > authigenic P (6.3%) > loosely sorbed P (0.8%), whereas in core sediments it followed the sequence: detrital P (61.7%) > Fe-bound P (17.0%) > authigenic P (13.1%) > organic P (7.5%) > loosely sorbed P (0.7%). Post-depositional reorganization of P was observed in both surface and core sediments, converting organic P and Fe-bound P to authigenic P. The accumulation rates and burial efficiencies of the total P in the intertidal area ranged from 118.70-904.98 μmol cm-2 a-1 and 80.29-88.11%, respectively. High burial efficiency of the total P is likely related to the high percentage of detrital P and the high sediment accumulation rate. In addition, the bioavailable P represented a significant proportion of the sedimentary P pool, which on average accounted for 37.4% and 25.1% of the total P in surface and core sediments, respectively. This result indicates that the tidal sediment is a potential internal source of P for this P-limiting estuarine ecosystem.
UR - https://www.scopus.com/pages/publications/58049117304
U2 - 10.1016/j.apgeochem.2008.11.008
DO - 10.1016/j.apgeochem.2008.11.008
M3 - 文章
AN - SCOPUS:58049117304
SN - 0883-2927
VL - 24
SP - 120
EP - 128
JO - Applied Geochemistry
JF - Applied Geochemistry
IS - 1
ER -