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Climate change
Descripción
University Soil Science Mapa Mental sobre Climate change, creado por Liv el 11/05/2013.
Sin etiquetas
soil science
soil science
university
Mapa Mental por
Liv
, actualizado hace más de 1 año
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Creado por
Liv
hace más de 11 años
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Resumen del Recurso
Climate change
positive feedback loop?
increased greenhouse effects
warmer soils
accelerated mineralisation of SOM
higher CO2 and methane emissions
goes in circle
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
Biomass
tropical forest = HIGHEST
all forests much higher than grasslands
tundra = LOW
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
Methane
25-30x as powerful a greenhouse effect as CO2
emitted from soils under wet anaerobic conditions
paddy fields
under aerobic conditions can be SINK
livestock
melting permafrost
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
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