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MATTER CYCLING IN MATTER CYCLING IN ECOSYSTEMSECOSYSTEMS
Nutrient Cycles: Global RecyclingNutrient Cycles: Global Recycling Global Cycles recycle nutrients through the Global Cycles recycle nutrients through the
earth’s air, land, water, and living organisms.earth’s air, land, water, and living organisms. Nutrients are the elements and compounds that Nutrients are the elements and compounds that
organisms need to live, grow, and reproduce.organisms need to live, grow, and reproduce. Biogeochemical cycles move these substances Biogeochemical cycles move these substances
through air, water, soil, rock and living organisms.through air, water, soil, rock and living organisms.
The Water CycleThe Water Cycle
Figure 3-26Figure 3-26
Fig. 3-26, p. 72
PrecipitationPrecipitation
Transpiration
Condensation
Evaporation
Ocean storage
Transpiration from plants
Precipitation to land
Groundwater movement (slow)
Evaporation from land Evaporation
from ocean Precipitation to ocean
Infiltration and Percolation
Rain clouds
RunoffSurface runoff
(rapid)
Surface runoff (rapid)
Water’ Unique PropertiesWater’ Unique Properties There are strong forces of attraction between There are strong forces of attraction between
molecules of water.molecules of water. Water exists as a liquid over a wide Water exists as a liquid over a wide
temperature range. temperature range. Liquid water changes temperature slowly.Liquid water changes temperature slowly. It takes a large amount of energy for water to It takes a large amount of energy for water to
evaporate.evaporate. Liquid water can dissolve a variety of Liquid water can dissolve a variety of
compounds.compounds. Water expands when it freezes.Water expands when it freezes.
Effects of Human Activities Effects of Human Activities on Water Cycleon Water Cycle
We alter the water cycle by:We alter the water cycle by: Withdrawing large amounts of freshwater.Withdrawing large amounts of freshwater. Clearing vegetation and eroding soils.Clearing vegetation and eroding soils. Polluting surface and underground water.Polluting surface and underground water. Contributing to climate change.Contributing to climate change.
The Carbon Cycle:The Carbon Cycle:Part of Nature’s ThermostatPart of Nature’s Thermostat
Figure 3-27Figure 3-27
Fig. 3-27, pp. 72-73
Effects of Human Activities Effects of Human Activities on Carbon Cycleon Carbon Cycle
We alter the We alter the carbon cycle by carbon cycle by adding excess COadding excess CO22 to the atmosphere to the atmosphere through:through: Burning fossil fuels.Burning fossil fuels. Clearing vegetation Clearing vegetation
faster than it is faster than it is replaced.replaced.
Figure 3-28Figure 3-28
Fig. 3-28, p. 74
CO
2 em
issi
on
s fr
om
fo
ssil
fu
els
(bil
lio
n m
etri
c to
ns
of
carb
on
eq
uiv
alen
t)
Year
Lowprojection
Highprojection
The Nitrogen Cycle: The Nitrogen Cycle: Bacteria in ActionBacteria in Action
Figure 3-29Figure 3-29
Fig. 3-29, p. 75
Gaseous nitrogen (N2)in atmosphere
Ammonia, ammonium in soil Nitrogen-rich wastes,remains in soil
Nitrate in soil
Loss byleaching
Loss byleaching
Nitrite in soil
Nitrification
Nitrification
Ammonification
Uptake by autotrophsUptake by autotrophsExcretion, death,
decomposition
Loss bydenitrification
Food webs on land
Fertilizers
Nitrogen fixation
Effects of Human Activities Effects of Human Activities on the Nitrogen Cycleon the Nitrogen Cycle
We alter the nitrogen cycle by:We alter the nitrogen cycle by: Adding gases that contribute to acid rain.Adding gases that contribute to acid rain. Adding nitrous oxide to the atmosphere through Adding nitrous oxide to the atmosphere through
farming practices which can warm the farming practices which can warm the atmosphere and deplete ozone.atmosphere and deplete ozone.
Contaminating ground water from nitrate ions in Contaminating ground water from nitrate ions in inorganic fertilizers.inorganic fertilizers.
Releasing nitrogen into the troposphere through Releasing nitrogen into the troposphere through deforestation.deforestation.
Effects of Human Activities Effects of Human Activities on the Nitrogen Cycleon the Nitrogen Cycle
Human activities Human activities such as such as production of production of fertilizers now fix fertilizers now fix more nitrogen more nitrogen than all natural than all natural sources sources combined.combined.
Figure 3-30Figure 3-30
Fig. 3-30, p. 76
Nitrogen fixation by natural processes
Glo
bal
nit
rog
en (
N)
fixa
tio
n(t
rill
ion
gra
ms)
Year
The Phosphorous CycleThe Phosphorous Cycle
Figure 3-31Figure 3-31
Fig. 3-31, p. 77
Dissolvedin Ocean
Water
Marine Sediments Rocks
uplifting overgeologic time
settling out weatheringsedimentation
LandFoodWebs
Dissolvedin Soil Water,Lakes, Rivers
death,decomposition
uptake byautotrophs
agriculture
leaching, runoff
uptake byautotrophs
excretion
death,decomposition
mining Fertilizer
weathering
Guano
MarineFoodWebs
Effects of Human Activities Effects of Human Activities on the Phosphorous Cycleon the Phosphorous Cycle
We remove large amounts of phosphate from We remove large amounts of phosphate from the earth to make fertilizer.the earth to make fertilizer.
We reduce phosphorous in tropical soils by We reduce phosphorous in tropical soils by clearing forests.clearing forests.
We add excess phosphates to aquatic We add excess phosphates to aquatic systems from runoff of animal wastes and systems from runoff of animal wastes and fertilizers.fertilizers.
The Sulfur CycleThe Sulfur Cycle
Figure 3-32Figure 3-32
Fig. 3-32, p. 78
Hydrogen sulfide
Sulfur
Sulfate salts
Decaying matter
Animals
Plants
Ocean
IndustriesVolcano
Hydrogen sulfideOxygen
Dimethyl sulfide
Ammoniumsulfate
Ammonia
Acidic fog and precipitationSulfuric acid
WaterSulfurtrioxide
Sulfur dioxide
Metallicsulfidedeposits
Effects of Human Activities Effects of Human Activities on the Sulfur Cycleon the Sulfur Cycle
We add sulfur dioxide to the atmosphere by:We add sulfur dioxide to the atmosphere by: Burning coal and oilBurning coal and oil Refining sulfur containing petroleum.Refining sulfur containing petroleum. Convert sulfur-containing metallic ores into free Convert sulfur-containing metallic ores into free
metals such as copper, lead, and zinc releasing metals such as copper, lead, and zinc releasing sulfur dioxide into the environment.sulfur dioxide into the environment.