Journal
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
Volume 113, Issue G4, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2008JG000780
Keywords
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Funding
- National Natural Science Foundation of China (NSFC) [40721004, 40701167, 40671171]
- Doctoral Program Foundation of Ministry of Education of China [20070269006]
- State Key Laboratory of Estuarine and Coastal Research [2008KYQNO1]
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The role of the marsh plant (Scirpus mariqueter) in phosphorus (P) biogeochemical cycling was investigated in the present study. The marsh plant had a significant influence on P adsorption, benthic fluxes and P speciation in the intertidal system. The adsorption capacities of P were significantly higher in the rhizosphere sediments (54.38-77.12 mg kg(-1)) than in the bare sediments (43.91-54.81 mg kg(-1)). Lower half saturation concentration constants also appeared in the rhizosphere sediments. Similar adsorption kinetic patterns were found for the bare and vegetated habitats, which showed an initial fast P adsorption reaction, followed by a slow adsorption process. However, compared with the unvegetated sediments, the relatively higher adsorption rate appeared in the rhizosphere sediments during the fast adsorption stage. Also, soluble inorganic P was effluxed into the overlying water in the unvegetated habitat. In contrast, soluble inorganic P was transported from the overlying water into the vegetated sediments during the growth season of S. mariqueter. The comparative analysis of P speciation in both bare and vegetated habitats revealed that S. mariqueter could enhance the accumulation of Fe-bound P, authigenic P and organic P in the rhizosphere sediments. The important role of S. mariqueter in P removal and storage has significant implications for the conservation and management of the Yangtze estuarine and intertidal marsh.
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