Speciation of phosphorus in a tidal floodplain forest in the Amazon estuary
Tóm tắt
The processes of release and retention of phosphorus (P) in soils of a tidal floodplain were studied at Combu Island (Belém/Brazil). Three parcels of 220m2 were chosen: low floodplain (LF), intermediate floodplain (MF) and high floodplain (HF). Two cores to 0.4 m depth were collected in each parcel, one week after the highest and lowest tides of the year. Organic phosphorus (P—OM) concentrations ranged from 0.02 ± 0.01 to 0.07 ± 0.02 mg/g, the highest concentrations were found in the HF parcel. On the other hand the HF parcel had the lowest concentrations of total inorganic phosphorus (TIP): 0.10 ± 0.03 to 0.11 ± 0.33 mg/g. The speciation of inorganic P suggested that P—Fe/Al is the main chemically bound P in soil (0.05 ± 0.01 to 0.20 — 0.04 mg/g). The tidal inundation of the floodplain appears to influence these chemical reactions involving phosphate retention and release.
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