AREC173 Lecture 3: AREC 173 Module 3
18 Oct 2016
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Document Summary
Slash and burn agriculture losing primary forest and gaining agricultural land. When water is used, it"s not lost forever. Surface to ground water sources for irrigation only a temporary x and is detrimental to the future. Deforestation depleting water storages, may have more rapid mov"t of water (more. Poor agriculture practices > fertilizer and pesticide pollution, erosion (leading to sedimentation, shortening the life of hydro facilities, ooding through river bed sedimentation) Effecting air or water quality > limits on availabilities. Overall, agriculture, forestry and land use (afolu) contributes about 20% of all ghg emissions at global scale. Sources of ghg in agriculture, forestry and other land use systems include: Co2 emissions from on-farm/forest energy use (gwp=1) Co2 from biomass decomposition and burning (gwp=1) N2o from soil, manure management, and biomass burning (gwp = 265-298) Ch4 livestock, manure management, rice management, and biomass burning (gwp = 28-36) Sinks of ghg in afolu systems > co2 uptake in soils and woody biomass.
