Part I Nitrogen and Phosphorus KEY CONCEPT Matter cycles in and out of an ecosystem Elements essential for life cycle through ecosystems A biogeochemical cycle is the movement of a particular chemical through the biological and geological parts of an ecosystem ID: 329373
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Slide1
Cycles
Part I: Nitrogen and Phosphorus
Slide2
KEY CONCEPT
Matter cycles in and out of an ecosystem.Slide3
Elements essential for life cycle through ecosystems. A biogeochemical cycle is the movement of a particular chemical through the biological and geological parts of an ecosystem.
Incl. Water, Oxygen, Carbon, Nitrogen, & Phosphorus Slide4
The Phosphorus Cycle
The element phosphorus (P)is released in the form of ionic phosphate (PO43-
)Weathering of rock, mining, some detergents and fertilizers
Phosphate is taken up by plants and fungiConsumers absorb phosphate from plants
Decomposers return phosphate to soilPhosphate leaches into water supply
May form new phosphate containing rockSlide5
geologic uplifting
rain
weathering of
phosphate from rocks
runoff
sedimentation
forms new rocks
leaching
phosphate in solution
animals
plants
decomposers
phosphate
in soil
The phosphorus cycle takes place at and below ground level.
Phosphate is released by the weathering of rocks.
Phosphorus moves through the food web and returns to the soil during
decomposition.
Phosphorus leaches
into groundwater
from the soil and
is locked in
sediments.
Both mining and
agriculture add
phosphorus into
the environment.Slide6Slide7
The Nitrogen Cycle
Bacteria fix nitrogen from the air
Consumers and producers incorporate nitrogen into their tissuesNitrogen can be fixed industrially from the air
Production of ammonia
Decay processes return nitrogen to the air
Nitrogen from fertilizers may contaminate water sourcesSlide8
nitrogen in
atmosphere
animals
denitrifying
bacteria
nitrifying
bacteria
nitrifying
bacteria
ammonium
ammonification
decomposers
plant
nitrogen-fixing
bacteria in soil
nitrogen-fixing
bacteria in
roots
nitrates
nitrites
The nitrogen cycle mostly takes place underground.
Some bacteria convert gaseous nitrogen into ammonia through a process called nitrogen fixation.
Some nitrogen-fixing bacteria live in
nodules on the
roots of plants;
others live
freely in
the soil.Slide9
Ammonia released into the soil is transformed into ammonium.
nitrogen in
atmosphere
animals
denitrifying
bacteria
nitrifying
bacteria
nitrifying
bacteria
ammonium
ammonification
decomposers
plant
nitrogen-fixing
bacteria in soil
nitrogen-fixing
bacteria in
roots
nitrates
nitrites
Nitrifying bacteria change the ammonium into nitrate.
Nitrogen moves through the food
web and returns
to the soil during
decomposition.Slide10Slide11
Aquarium Nitrogen Cycle