ISSN:
1573-5117
Keywords:
sediment
;
phosphorus fractions
;
reservoirs
;
trophic status
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Total phosphorus in sediment (Psed) and its fractional composition (reactive phosphate extracted with NaOH, NaOH-RP, reactive phosphate extracted with HCl, HCl-RP, and residual phosphate, residual-P) have been determined in superficial sediments of 43 Spanish reservoirs located in different limnological regions and with different trophic states. Data were evaluated by statistical analysis to examine the influence of regional distribution and trophic status. Relations with calcium, manganese, iron and aluminium contents have also been studied. In the western part of Spain, reservoirs presented the highest values on average of Psed, NaOH-RP and residual-P (1296, 328 and 877 µg g−1 dw., respectively) and the lowest values of HCl-RP (91.0 µg g−1 dw.). The main phosphorus fractions were residual-P (〉 50%) and NaOH-RP (〉10%). In the eastern area, Psed NaOH-RP and residual-P attained the lowest values on average (502, 4 and 330 µg g−1 dw., respectively), whereas HCl-RP presented the highest values (167 µg g−1 dw.). The main fractions were residual-P (〉 50%) and HCl-RP (〉 25%). Trophic status seemed to be a secondary factor controlling Psed. The highest contents of Psed were found in eutroohic reservoirs, but only when those of the same region were compared, and the statistical significance (ANOVA F test) of the observed differences was very small (p 〈 0.057).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00050723
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