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Interstitial water chemistry and nutrients fluxes from tropical intertidal sediment

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Title Interstitial water chemistry and nutrients fluxes from tropical intertidal sediment
 
Creator Ram, Anirudh
Zingde, M D
 
Description 310-318
Depth
profiles of chlorinity, nutrients, pH and alkalinity in
interstitial waters from high porosity, carbon rich sediment cores of Gorai
creek (near Bombay)
were studied in different seasons to evaluate temporal changes in relation to
their concentrations in the overlying creek water. The high chlorinity creek
water infiltrating in the bed after September, progressively pushed down the
monsoonal low chlorinity water trapped in the sediment resulting in a
well-defined chlorinity minimum at the intermediate depth which progressively
mi grated downwards as the dry season advanced. In the presence of high

concentrations
of NO3--N throughout the core lengths, the occurrence of
high Talk was attributed to the enhanced rate of surface microbial
activity and its subsequent downward transport with chlorinity. The inorganic
products (NO3--N, NO2- -N, NH4+-N,
PO43--P) of aerobic oxidation of organic matter accumul
ated in the 0-4 cm sediment section before their transport. The nature of NO3--N
profile suggested its generation in the surficial sediment followed by
utilization in the intermediate level with the consumption rate decreasing in
the bottom sections. An intermediate maxima of NH4+-N and
PO43-P prevailed in most cores which gradually shifted
downwards with chlorinity. A continuous build -up of NH4+-N
in the interstitial waters unlike other nutrients was evident. Markedly high
N:P molar ratios in surficial sections suggested the removal of

PO43--P
from interstitial water. The fluxes of all nutrients were oriented towards the
water column. Hence, the nutrients released in the surficial interstitial water
were partly transported to the overlying water with a significant portion
migrating into the sediment with chlorinity.
 
Date 2014-01-13T05:13:06Z
2014-01-13T05:13:06Z
2000-12
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/25496
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.29(4) [December 2000]