83943
Climate change
- positive feedback loop?
- increased greenhouse effects
- warmer soils
- accelerated mineralisation of SOM
- higher CO2 and methane emissions
- goes in circle
- goes in circle
- higher CO2 and methane emissions
- accelerated mineralisation of SOM
- warmer soils
- increased greenhouse effects
- Carbon cycle
- C pool in soil = 2x that in
atmosphere, ~3x that in
biomass
- rates of CO2 emitted from soils
balanced by CO2 uptake by
plants
- NPP affected by CO2
and climate change
- affected by veg type and soil conditions
- affected by latitude
- affected by latitude
- affected by veg type and soil conditions
- C pool in soil = 2x that in
atmosphere, ~3x that in
biomass
- Biomass
- tropical
forest =
HIGHEST
- all forests much
higher than grasslands
- tundra = LOW
- tropical
forest =
HIGHEST
- Carbon sequestering
- soil restoration
- woodland
regeneration
- no-till farming
- cover crops
- nutrient management
- manuring and sludge application
- improved grazing and agroforestry practices
- growing energy crops on 'spare' land
- reversing C loss => INCR in
productivity
- soil restoration
- Methane
- 25-30x as powerful a
greenhouse effect as
CO2
- emitted from soils under
wet anaerobic conditions
- paddy fields
- paddy fields
- under aerobic
conditions can be
SINK
- livestock
- melting permafrost
- 25-30x as powerful a
greenhouse effect as
CO2
- Nitrous oxide
- 300x more
powerful than
CO2 as g.g
- escapes from N cycle -
aerobic and anaerobic
conditions (denitrification and nitrification)
- emission rates strongly influenced by
rates and pathways by which N enters
soil
- fertilisers
- 300x more
powerful than
CO2 as g.g
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