Journal article
Planktonic and microbial contributions to phosphorus release from fresh and air-dried sediments
Marine and Freshwater Research, Vol.46(7), pp.1039-1045
1995
Abstract
There was a fivefold increase in the concentration of P (dissolved reactive phosphorus) after intact sediment cores from North Lake, Western Australia, were air-dried and reflooded. Effects of plankton and microbial biomass on phosphorus release were investigated. Freshly killed plankton released P before drying, but less P was released when plankton biomass was air-dried. Bacteria were important contributors of P during drying and rewetting, and their contributions occurred through two processes: (I) when sufficient moisture and oxygen were available, bacteria rapidly removed soluble P from the water and incorporated it into the particulate phase, the amount of P taken up being positively correlated with bacterial respiration; and (2) upon drying, bacterially stored P was partly returned to the water, the release increasing with increasing bacterial uptake. The bacterial contribution of P upon drying was further investigated by sterilizing air-dried and wet sediments with a low dose of gamma irradiation (10 kGy). It was thus possible to discriminate among P contributed from the native (initial) microbial biomass (Pi) before drying, P released from the increased (developed) microbial biomass (Pii) during drying, and P stored in bacteria that had survived air-drying (Ps). It was estimated that air-drying killed about 76% of the microbial biomass. At relatively low external P concentrations (<1000 μg L-1), the increased P brought about by air-drying was mainly derived from killed microbial biomass.
Details
- Title
- Planktonic and microbial contributions to phosphorus release from fresh and air-dried sediments
- Authors/Creators
- S. Qiu (Author/Creator)A.J. McComb (Author/Creator)
- Publication Details
- Marine and Freshwater Research, Vol.46(7), pp.1039-1045
- Publisher
- CSIRO Publishing
- Identifiers
- 991005542662507891
- Copyright
- © CSIRO 1995
- Murdoch Affiliation
- School of Environmental Science
- Language
- English
- Resource Type
- Journal article
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- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.2 Marine Biology
- 3.2.216 Lake Ecosystems
- Web Of Science research areas
- Fisheries
- Limnology
- Marine & Freshwater Biology
- Oceanography
- ESI research areas
- Plant & Animal Science