Abstract
Abstract. Forest disturbances contribute to the decrease in carbon sequestration potential and ecosystem services in a watershed. One of the important watersheds that is affected by land use changes and disturbances is the Pantabangan-Carranglan Watershed. The ability of the watershed to provide ecosystem services is affected by the existing land use and land cover (LULC) and its future trends. Therefore, this study aims to assess the changes in the LULC, forest disturbances, and potential carbon stock in the watershed using satellite images. The LULC types and indices used in detecting forest disturbances were classified and generated from the Landsat 8 satellite images covering two different years. The potential carbon storage in the watershed was estimated using the Integrated Valuation of Ecosystem Services and Tradeoffs (InVEST) Carbon model. The information generated can be used in the conduct of valuation studies and land use planning in the watershed.
Highlights
In the Philippines, changes in the watershed land use and land cover (LULC) are affected by several factors
The most dominant land use/land cover (LULC) for 2014 is open/barren land followed by forest
Other activities conducted by the Department of Environment and Natural Resources (DENR) in the area through the years include plantation and agroforestry establishment (Ancog, Florece and Nicopior, 2016)
Summary
In the Philippines, changes in the watershed land use and land cover (LULC) are affected by several factors. The disturbances in the forest, which may include harvesting and construction activities, contribute to the decrease in carbon sequestration potential and ecosystem services. The conversion of a natural system like the forest into a managed system results to carbon imbalance (Toru and Kibret, 2019). These disturbances will impact the forest cover, components, and biodiversity (Hu and Hu, 2020). Changes in the forest cover has been observed in several areas in the Philippines. The forest cover of Mount Pulag National Park decreased from 1990 to 2020 due to human interventions (Doyog, Lumbres and Baoanan, 2021)
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