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Week 6 - Module 2 (Lec 14) (Planetary Boundaries (Climate change, Ocean…
Week 6 - Module 2 (Lec 14)
Nutrient cycle in ecosystems
Mass Balance/ Nutrient Balance
Conservation of Mass
Net change = Input + Output + Internal change
Factors to influence on nutrient cycle
Nutrient Type
Natural Existence
Gaseous
Liquid
Soild
Mobility
Time
Climate
Carbon cycle
Temperature
Moisture
Affects biological processes
Plant growth
Microbial processes
Soil Type
Topography
Vegetation
Vegetation type may have influences on nutrient cycle = Grassland vs. Forest
Human Activities
Population growth
Urban sprawl = shift from Agro-ecosystem to urban ecosystem
Catchment (watershed)
Important issues for nutrient cycling
Boundary of system
Internal structures
Number of sub-system
Planetary Boundaries
Climate change
Ocean acidification
Oxygen levels
Atmosphere aerosols
P and N cycles
freshwater use
land system change
biodiversity
chemical pollution