Abstract—The present work analyzes the sources of supply and regulation of ecosystem services (ES) in the Tiltepec watershed, Oaxaca, Mexico, specifically the production of fuelwood, water for human consumption, forage for domestic livestock, as well as regulation for runoff and sediments estimated with the MUSLE model (Modified Universal Soil Loss Equation), Random sampling points were defined according to the soil used and coverage, to determine production of fuelwood and forage. Firewood was evaluated in quadrants of 10 x 10 m for tree strata and 5 x 5 m for shrub strata. Forage production was determined with lines of 20 m and quadrants of 0.25 x 0.25 m to determine biomass and vegetation cover. Water supply was estimated with inflows from springs and the storage capacity of infrastructure works and water demand estimated with the current population and the maximum daily and hourly consumption. The estimated average fuelwood consumption was 1.4 kg person-1 day-1for a total volume of 3,189.5 m3. The estimated average forage yield was 856.6 kg ha-1 and a grazing coefficient of 13.9 ha animal unit (AU-1), with a census of 171.7 AU. The springs produce a daily volume of 150.4 m3 and the storage water capacity is 184.7 m3 for human consumption and 718.5 m3 for irrigation and recreational uses. With the MUSLE model, a reduction in runoff of 33.93% and 62.93% in specific degradation was estimated comparing the current scenario with that of 1984. The presence of ES in the Tiltepec watershed is essential to provide well-being to local people and regulation of erosion process through works, soil and water conservation practices. These will enable better provision of goods and services.
Keywords— provision and regulation services, water, forage, firewood and sediments.
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