Abstract
Changes in the fractional P-composition and the P-adsorption capacity of the Garcines (Camargue, France) a freshwater marsh sediment were studied. Desiccation was found to cause considerable shifts in the fractional composition of the sediment layers studied. In the surface layer an increase in Fe(OOH) ≈ P and a slight decrease in CaCO3 ≈ P occurred. A specific mineralization of Acid Soluble Organic Phosphate (ASOP) occurred: about 40% (about 70 μg g−1) of Acid Soluble Organic Phosphate was mineralized in the surface sediment and about 60% (about 200 μg g−1) in a deeper layer. Therefore, Acid Soluble Organic Phosphate may be considered to be of ecological importance as it seems to be the main active Org-P fraction, under the conditions tested.
Desiccation was found to have a positive effect on the phosphate adsorption capacity of the sediment, due to the formation of Fe(OOH) from FeS. Approximately 100% of o-P adsorbed was recovered in the inorg-P-fractions. Since the inactivation of bacteria was found to have no effect on the adsorption capacity of the sediment, bacteria seem not to play an active role in the P adsorption by the sediment.
In chloroform treated sediments less residual organic phosphate occurred than in the none treated, indicating that Pbact is recovered in that fraction.
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Abbreviations
- chem-Xphys :
-
inorg-Pdiss, Tot-Nsed
- ASOP:
-
acid soluble organic phosphate
- CaCO3≈P:
-
calcium bound phosphate
- Fe(OOH):
-
iron hydroxide
- Fe(OOH)≈P:
-
iron bound phosphate
- ROP:
-
residual organic phosphate
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De Groot, CJ., Fabre, A. The impact of desiccation of a freshwater marsh (Garcines Nord, Camargue, France) on sediment-water-vegetation interactions. Hydrobiologia 252, 105–116 (1993). https://doi.org/10.1007/BF00000132
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DOI: https://doi.org/10.1007/BF00000132