Transcript PHOSPHATE IN LAKES AND STREAMS

PHOSPHATE IN
LAKES AND
STREAMS
PHOSPHORUS IN SURFACE WATER
• PARTICULATE PHOSPHORUS
• In living things
• In minerals or adsorbed to clays, etc.
• Adsorbed to dead organics
• DISSOLVED PHOSPHORUS
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Orthophosphates
Polyphosphates
Organic molecules with phosphorus
Esters of phosphate
P IN STRATIFIED LAKES
TOTAL P AND CHLOROPHYLL
NUTRIENT PROFILES OF THE RIFT LAKES
SRP= Soluble Reactive Phosphate
PHOSPHATE CYCLE
RED MUD – BLACK MUD
P AT SEDIMENT – WATER INTERFACE
Chambers
oxygenated
Chambers
anoxic
Conditions 30cm from
bottom in 14M deep lake.
SULFATE REDUCING BACTERIA AND
RELEASE OF PHOSPHATE
EPIPELIC ALGAE, PH & PHOSPHATE
MACROPHYTES PUMPING P FROM
SEDIMENT TO WATER COLUMN
FORMS OF P IN THE EPILIMNION
CALCITE AND P ADSORPTION
ANTHROPOGENIC SOURCES
PHOSPHORUS AND LAKE 226
P AND
PRIMARY
PRODUCTION
PRODUCTIVITY AND TOTAL
PHOSPHORUS
LEVEL OF PRODUCTIVITY
TOTAL P (µg/L)
ULTRA OLIGOTROPHIC
<5
OLIGO MESOTROPHIC
5-10
MESO EUTROPHIC
10-30
EUTROPHIC
30-100
HYPEREUTROPHIC
>100
NUTRIENT LOADING
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WATERSHED AREA
AREAL INPUT RATE
FLUSHING RATE
EXTENT OF MIXING
SOURCES FOR NUTRIENT LOADING IN
CHESAPEAKE BAY
POINT-SOURCE DECLINE IN
PHOSPHATE LOADING IN CHESAPEAKE
BAY
LAKE POWELL AND LAKE MEADE
MISSISSIPPI RIVER
LAKE PONCHARTRAIN
LAKE PONCHARTRAIN
LAKE ERIE