portuguese national inventory report on greenhouse gases, 1990

Agriculturefact that direct emissions occur solely in agricultural soils whether indirect emissions will occurin whenever conditions are adequate: in agricultural soils, non agricultural soils and evenaquatic, Benthic and wetland systems.Also, all NO x and NH 3 emissions from other emissions sources may settle in soil and water andresult in similar N 2 O emissions. However, estimates of indirect emissions from these sourcesare not included in the Portuguese <strong>inventory</strong>.Indirect emissions of N 2 O from ammonia and NO x volatilisation where estimated from ammoniavolatilised whether actual indirect N 2 O emissions occurred in the Portuguese territory or not. Inthe case of N 2 O indirect emissions from leaching and runoff the geographical characteristics ofthe territory - where there are no water basins discharging to other countries - cause that allindirect emissions will occur still on the <strong>national</strong> territory or nearby ocean waters 123 .Even though this nitrogen flow is evident in Figure 6.26, it’s important to stress the fact thatindirect emissions of N 2 O from volatilization result from 2 volatilization processes: the first asdirect NH 3 /NO x emission and the second as N 2 O indirect emission. Between these twoprocesses occurs deposition of nitrogen from NH 3 /NOx direct emissions.Figure 6.37 shows the percent importance of each sub-source for year 2011, where:- Syn. Fert. Vol. – Synthetic Fertilizers N volatilization;- Syn. Fert. Leach - Synthetic Fertilizers N resulting from leaching and runoff;- An. Was. Vol. – Volatilization of N from Animal Waste (manure) applied to soilas fertilizer;- An. Was. Leach. - Leaching and runoff of N from Animal Waste (manure)applied to soil as fertilizer- Graz. Vol. – N volatilization from droppings during Grazing;- Graz. Leach. – N leached from droppings during Grazing;- MM. Vol. – Volatilizations of N from Manure Management Systems;- MM. Leach. – Leaching and runoff of N from Manure Management Systems;Indirect emissions from runoff and leaching from synthetic fertilizers, animal manure applied tosoil and direct droppings during grazing are significant sources of N 2 O indirect emission in thissource category.123 In fact, part of indirect N2O emissions from leaching and runoff from agriculture activities in Spain will occur mostprobably in Portuguese territory. These emissions are not included however in the Portuguese <strong>inventory</strong>.Portuguese National Inventory Report 2013MAMAOT6-77