Transformations between organic and inorganic sediment phosphorus in Lake Balaton

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

In order to estimate microbial P content and biological P uptake in sediments, the tungstate precipitation method of Orrett & Karl (1987) was used in sediment extracts. This method allows a simple and rapid separation of organic and inorganic 32P radioactivity. Either inorganic 32P (as carrierfree H332PO4) or organic 32P (as 32P-labelled algal material) was added to surface sediment suspensions of shallow Lake Balaton. Inorganic 32P was rapidly transformed into organic 32P, and this process was completely inhibited by formaline. P content of living benthic microorganisms was estimated from steady state distribution of the radioactivity. Transformation of algal organic P into inorganic P could also be detected. In extremely P limited Lake Balaton benthic microorganisms were shown to supplement their high P requirements by inorganic P uptake. The velocity of the inorganic into organic P transformation, i.e. the rate of microbial P uptake, was comparable to P uptake in the water column. Microbial P uptake contributed significantly to total P fixation by sediments, particularly at low (≤ 100 μg P l-1) phosphate additions.

Original languageEnglish
Pages (from-to)193-201
Number of pages9
JournalHydrobiologia
Volume253
Issue number1-3
DOIs
Publication statusPublished - Mar 1993

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Lakes
Phosphorus
Sediments
phosphorus
uptake mechanisms
lakes
sediments
Radioactivity
lake
radioactivity
Microorganisms
sediment
microorganism
microorganisms
water uptake
fixation
Phosphates
water column
phosphate
phosphates

Keywords

  • biotic and abiotic P uptake by sediments
  • microbial P content
  • separation of organic and inorganic P radioactivity

ASJC Scopus subject areas

  • Water Science and Technology
  • Pollution
  • Environmental Science(all)
  • Oceanography
  • Aquatic Science

Cite this

Transformations between organic and inorganic sediment phosphorus in Lake Balaton. / Istvánovics, V.

In: Hydrobiologia, Vol. 253, No. 1-3, 03.1993, p. 193-201.

Research output: Contribution to journalArticle

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