carbon cycle – units = gt c = 10 15 g c. carbon dioxide 1 2 3
TRANSCRIPT
Carbon cycle – units = Gt C = 10 15 g C
Carbon dioxide
1
2
3
Pathways of Nitrogen
N2
Molecular Nitrogen
NH4+
Ammonium ion / Ammonia
Nitrogen Fixing
Amino AcidsOrganic Nitrogen Assim
ilationAmmonific
ation
NO2-1
Nitrite
NO3-1
Nitrate
Denitrification
Via NO, N 2O
Assimilation
Nitrification
Nit
rifi
cati
on
Den
itri
fica
tion
Nitrogen Fixing
N2
Molecular Nitrogen
NH4+
Ammonium ion / Ammonia
Nitrogen Fixing
Amino AcidsOrganic Nitrogen Incorporation
Ammonification
NO2-1
Nitrite
NO3-1
Nitrate
Denitrification
Via NO, N 2O
Assimilation
Nitrification
Nit
rifi
cati
on
Den
itri
fica
tion
Nitrification
N2
Molecular Nitrogen
NH4+
Ammonium ion / Ammonia
Nitrogen Fixing
Amino AcidsOrganic Nitrogen Incorporation
Ammonification
NO2-1
Nitrite
NO3-1
Nitrate
Denitrification
Via NO, N 2O
Assimilation
Nitrification
Nit
rifi
cati
on
Den
itri
fica
tion
Nitrification
• NO2-1 -> NO3
-1 and NH4
+ -> NO2-1
• Oxidizing nitrogen• Nitrosomonas
and Nitrococcus
Incorporation/Assimilation
N2
Molecular Nitrogen
NH4+
Ammonium ion / Ammonia
Nitrogen Fixing
Amino AcidsOrganic Nitrogen Assim
ilationAmmonific
ation
NO2-1
Nitrite
NO3-1
Nitrate
Denitrification
Via NO, N 2O
Assimilation
Nitrification
Nit
rifi
cati
on
Den
itri
fica
tion
Ammonification
N2
Molecular Nitrogen
NH4+
Ammonium ion / Ammonia
Nitrogen Fixing
Amino AcidsOrganic Nitrogen Incorporation
Ammonification
NO2-1
Nitrite
NO3-1
Nitrate
Denitrification
Via NO, N 2O
Assimilation
Nitrification
Nit
rifi
cati
on
Den
itri
fica
tion
Denitrification
N2
Molecular Nitrogen
NH4+
Ammonium ion / Ammonia
Nitrogen Fixing
Amino AcidsOrganic Nitrogen Incorporation
Ammonification
NO2-1
Nitrite
NO3-1
Nitrate
Denitrification
Via NO, N 2O
Assimilation
Nitrification
Nit
rifi
cati
on
Den
itri
fica
tion
Human impacts on the Earth’s ecosystems
Biotic addition and loses
Land transformation
Global biochemistry
Climate change
Ecosystem servicesDefinition: refers to all the processes through which natural ecosystems and the species they contain help sustain human life on this planet.
Examples: Purification of air and water, mitigation of droughts and floods, generation and preservation of soils and soil fertility, detoxification and decomposition of wastes, pollination of crops and natural vegetation, dispersal of seeds