Modern and historic accumulation rates of phosphorus in Lake Okeechobee, Florida

Patrick L. Brezonik, Daniel R. Engstrom

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

Phosphorus accumulation rates in depositional zone sediments of Lake Okeechobee were determined in 11 mudzone cores and two peat-zone cores dated by 210Pb. Although difficulties were encountered in interpreting 210Pb data from some sites, reliable dating of sediments from the mud zone of this shallow lake is possible. Sediment accumulation rates in this zone have increased during the present century by an average of about twofold, and accumulation of organic sediments in the lake during pre-settlement times apparently was much slower than during the past century. Concentrations of all forms of sedimentary P but especially nonapatite inorganic-P and organic-P also have increased since pre-settlement times and especially since about 1940. Annual P accumulation rates in the lake's sediments have increased about fourfold during the 1900s, with most of the increase occurring in the past 40-50 years. The recent accumulation rate of sedimentary P (past ~ 10 years) agrees within a factor of 1.5 with the net retention of P in the lake calculated from published input-output mass balances.

Original languageEnglish (US)
Pages (from-to)31-46
Number of pages16
JournalJournal of Paleolimnology
Volume20
Issue number1
DOIs
StatePublished - Jan 1 1998
Externally publishedYes

Keywords

  • Eutrophication
  • Lake Okeechobee
  • Lead-210 dating
  • Phosphorus
  • Phosphorus loading

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