Nitrous oxide and methane emissions from hedgerow systems in Claveria, Misamis Oriental, Philippines: an inventory
2011
Magcale-Macandog, D.B. | Abucay, E.R. | Visco, R.G. | Queblatin, P.N., Philippines Univ.Los Baños, College,Laguna 4031 (Philippines) | Miole, R.N., Mindanao State Univ.,Marawi City (Philippines) | Abas, E.L., Cotabato State Foundation of Science and Technology, Cotabato(Philippines) | Comajig, G.M. | Calub, A.D., Philippines Univ. Los Baños, College,Laguna 4031 (Philippines)
Reports on N2O emissions from tree-based agricultural systems in the humid tropics is very minimal even though these systems are widely practiced in these areas. This study estimated nitrous oxide emissions through inorganic fertilizer application, tree litterfall and decomposition, maize residue incorporation and livestock manure in Gmelina arborea and Eucalyptus deglupta hedgerow agroforestry systems. Methane emissions from livestock holdings in small holder farms in Claveria, Misamis Oriental, Philippines were likewise estimated following IPCC 2006 guidelines for national GHG inventories.Total emissions from the hedgerow systems studied range from 3.56 to 7.46 kg N2O/ha/yr. The major source of N2O emissions is direct N2O emissions from soil, ranging from 2.08 to 5.08 kg N2O/ha/yr. Inorganic fertilizer applied, maize crop residue incorporation and leaf litter fall were the major sources of direct N2O emissions from the soil. Indirect N2O emission from leaching is another source of N2O emissions with values ranging from 0.74 to 1.41 N2O/ha/yr. N2O emissions from these hedgerow systems can be minimized with the proper design of the hedgerow system, proper component tree species and soil fertility management. Enteric fermentation is the major source of methane emissions from domestic livestock in Claveria. Non-dairy cattle were the main contributor of CH4 emissions from enteric fermentation. Swine manure contributed largely to CH4 emissions from manure management. N2O emissions from the study site is comparable to reported emissions from improved agroforestry systems and mixed fallow system in tropical areas in Kenya and Peruvian Amazon. On the other hand, methane emissions from enteric fermentation of dairy cattle in the study area is low compared to dairy cattle in developed countries.
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