ISSN:
1573-5117
Keywords:
Fertilizer
;
Nutrients
;
Soluble Phosphate
;
Pond
;
Sediment
;
Erosion
;
Najas
;
Charales
;
Potamogeton
;
Phosphate Transport
;
Phosphate Fixation
;
Sediment phosphate uptake
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Two surfaces soils with contrasting physical and chemical characteristics were placed in model ponds to provide a sediment phosphate (P) source. Water samples were obtained weekly or biweekly and analyzed for total, total soluble, and soluble reactive P. Fertilizer P additions which exceeded sediment P absorption capacity occasionally tended to produce significantly higher P concentrations. Smaller P additions had no influence on pond P concentrations and no relationship between pond P concentrations and sediment EPC values was found. Soluble reactive P concentrations in most of the ponds were similar and seldom 〉 5 µg/1. Two mechanisms significantly affected P transport from the sediments. The first were macrophytic plants which provided a large P sink in the water column. The second was fixation of readily soluble P within the sediments. Plant growth within the ponds used 〈 5% of the readily soluble P initially present. Diffusion of P from the sediments did not support large SRP concentrations within the ponds.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00030072
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