Unit 4 Nutrient Cycles

Includes: Carbon Cycle, Nitrogen Cycle, Fertilisers and Eutrophication

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6.1 _ The Carbon Cycle
What causes a reduction in CO2?
Plants using CO
2 for photosynthesis
Oceans absorb it
What causes an increase in CO2?
Respiration of plants and animals
Decay/Death release CO 2 into soil
Combustion of fossil fuels
Deforestation

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The Greenhouse effect and Global Warming
The Greenhouse effect
Short wave radiation enters Earth's atmosphere
Some is reflected back into space
However due to the cloud of greenhouse gases , a lot of the radiation
can't get out and is therefore trapped
The trapped radiation consequently heats up the Earth's atmosphere
Consequences of Global Warming
Global temperatures are increasing over time due to the increase in CO2
levels:
Melting of Polar Ice Caps
Rise in Sea Level
Higher temperatures and lower rainfall rates could lead…read more

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Obtain carbohydrates from the plant
and the plants acquires amino acids
from the bacteria
Ammonification
Nitrogen compounds from dead organisms are turned into ammonium
compounds
These compounds include: urea, proteins, nucleic acids and vitamins
Saprobiotic microorganisms , mainly fungi and bacteria , feed on these
materials, releasing ammonia , which then forms ammonium ions in
the soil
This is where nitrogen returns to the non-living component of the
ecosystems
Nitrification
The process by which ammonium compounds in the soil are changed
into nitrogen compounds which…read more

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The process is which nitrates in the soil are converted to nitrogen gas
by denitrifying bacteria
They use nitrates in the soil to carry out respiration and produce
nitrogen gas
This happens under anaerobic conditions , in waterlogged soils
6.4 Use of Natural and Artificial Fertilisers
Fertilisers are used to help replenish nutrients in the soil for agriculture.
There are two types :
1.…read more

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Environmental Consequences of using Nitrogen
Fertilisers
Effects of Nitrogen Fertilisers
Reduced Species Diversity - nitrogen rich soils favour the growth of
grasses and other rapidly growing species, which out compete other
species that eventually die out
Leaching - may lead to pollution of watercourses
Eutrophication - cause by leaching of fertilisers into water courses
What is Leaching?
It is the process by which nutrients are removed from the soil .…read more

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