Cries of the Canopy: Forecasting the Fate of Forests in General Nakar, Quezon, along the Sierra Madre
Keywords:
Deforestation, Sierra Madre Mountain Range, Remote Sensing, Geospatial Analysis, Forest Cover ChangeAbstract
This research utilized a quantitative-descriptive-computational methodology for determining forest area changes for the area encompassed by the Sierra Madre Mountain Range, and particularly for the area covered by the municipality of General Nakar in Quezon Province. Through geospatial information obtained from validated satellite images interpreted with geographical information technology, pixel area measurements for 2016, 2019, and 2022 were processed from formulaic calculations from a computational system. Determinations showed that there has been a gradual and consistent reduction with respect to forest area coverage throughout the duration, indicating a progressive and non-isolated form of deforestation. Further determinations from trend analysis indicated that such a progressive decline might be expected for at least the next few years, given the prevailing conditions. With such consistent reductions with respect to forest area coverage, such areas can be expected to be increasingly susceptible to vulnerabilities with respect to soil and water management. Nonetheless, despite such difficulties, such determinations verified and supported a scientifically valid method for localized forest area changes with equal efficiency through quantitative and computer-based calculations and analysis.
References
Chokkalingam, U., Sabogal, C., Almeida, E., & Carandang, A. (2021). Local participation, monitoring, and governance in forest landscape restoration. Land Use Policy, 104, 105384.
https://doi.org/10.1016/j.landusepol.2021.105384
Climate Change Commission. (2024). State of the Philippine environment report 2024. Government of the Philippines.
Climate Change Commission. (2024, September 26). Sierra Madre: mountain range for resilience. Climate Change Commission – Government of the Philippines. https://climate.gov.ph/news/934
Climate Change Commission. (n.d.). Tree cover loss and forest trends in the Philippines. https://climate.gov.ph/news
Department of Environment and Natural Resources. (2025). ENR Compendium 2024: Forest Cover of the Philippines by region as of December 2020
[Environmental statistics report]. DENR Data Portal. https://denr.gov.ph/denr-data-portal/enr-compendium-2024/
Department of Environment and Natural Resources. (2023). Philippine forestry statistics. Forest Management Bureau. Retrieved from https://forestry.denr.gov.ph/fmb_web/about-fmb/statisticses/
FAO. (2020). Global Forest Resources Assessment 2020: Philippines report. Retrieved from https://www.fao.org/forest-resources-assessment
FAO. (2020). Global forest resources assessment 2020: Remote sensing and GIS applications. Food and Agriculture Organization of the United Nations. https://www.fao.org
Food and Agriculture Organization of the United Nations. (2020). Global forest resources assessment 2020: Main report. FAO. https://doi.org/10.4060/ca9825en
Forest Foundation Philippines. (2025). Deforestation and forest degradation analysis of Southern Sierra Madre, Philippines using Google Earth Engine and community mapping. Retrieved from https://www.forestfoundation.ph/wp-content/uploads/2025/03/Deforestation-and-Forest-Degradation-Analysis-of-Southern-Sierra-Madre-Philippines-Using-Google-Earth-Engine-and-Community-Mapping.pdf
Forest Foundation Philippines. (2025). State of Philippine forests: Trends, threats, and opportunities. Forest Foundation Philippines. https://www.forestfoundation.ph
Forest Foundation Philippines. (2019). Sierra Madre watershed and biodiversity report: Disaster risk reduction in Eastern Luzon. Forest Foundation Philippines. https://www.forestfoundation.ph
Gabriel, M. J. C., Israel, K. P. R., Ugat, B. Z. H., Hintural, W. P., & Baldonado, M. M. M. (2025). Analysis of the contemporary drivers of deforestation and forest degradation in Southern Sierra Madre Region, Philippines. Science and Engineering Journal, 2025 Special Issue, 225–234. Retrieved from https://scienggj.org/2025/2025%20Special%20Issue/20/SciEnggJ%202025%20Special%20Issue%20225-234-Gabriel%20et%20al.pdf
Garcia, J., & Principe, R. (2024). Localized forest disturbance trends using satellite indices in tropical regions. Environmental Monitoring and Assessment, 196(5), 405. https://doi.org/10.1007/s10661-024-11123-4
Global Forest Watch. (2024). General Nakar, Quezon: Forest cover loss and statistics. Retrieved from https://www.globalforestwatch.org/dashboards/country/PHL/62/11/
Journal of Threatened Taxa. (2021). Forecasting forest loss using historical trends: Case studies from tropical regions. Journal of Threatened Taxa, 13(12), 18945–18957. https://doi.org/10.11609/jott.6521.13.12.18945-18957
Hansen, M. C., Potapov, P. V., Moore, R., Hancher, M., Turubanova, S. A., Tyukavina, A., & Townshend, J. R. G. (2013). High-resolution global maps of 21st-century forest cover change. Science, 342(6160), 850–853. https://doi.org/10.1126/science.1244693
Haribon Foundation. (2025, November 12). Sierra Madre losing 9,000 hectares of forest cover each year — Haribon. The Philippine Star. https://www.philstar.com/headlines/2025/11/12/2486728/sierra-madre-losing-9000-hectares-forest-cover-each-year haribon
Israel, A., Perez, L., & Santos, M. (2024). Quantitative assessment of forest cover change in the southern Sierra Madre range using GIS and remote sensing. Journal of Environmental Informatics, 33(2), 102–118. https://doi.org/10.3808/jei.2024.021
Israel, K. P. R., Gabriel, M. J. C., Hintural, W. P., & Baldonado, M. M. M. (2024). Deforestation and forest degradation analysis of Southern Sierra Madre, Philippines using Google Earth Engine and community mapping. The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, XLVIII-4/W8-2023, 313–320.
https://doi.org/10.5194/isprs-archives-XLVIII-4-W8-2023-313-2024
Lasco, R., Pulhin, F., & Cruz, R. V. O. (2013). Climate change and forest ecosystems in the Philippines: Vulnerability, impacts, and adaptation. Journal of Environmental Science and Management, 16(1), 1–14.
Llait, C. O. (2024). Tree species composition and diversity in a secondary forest along the Sierra Madre Mountain Range in Central Luzon, Philippines. Journal of Zoology and Botany Gardens, 5(1), 51–65. https://www.mdpi.com/2673-5636/5/1/4
National Mapping and Resource Information Authority. (2022). Land cover classification map of the Philippines (2022) [Raster dataset]. NAMRIA. https://www.namria.gov.ph/jdownloads/Annual_Report/2022_NAMRIA_Annual_Report.pdf
National Mapping and Resource Information Authority. (2019). Land cover classification map of the Philippines (2019) [Raster dataset]. NAMRIA. https://www.namria.gov.ph/jdownloads/Annual_Report/2019_NAMRIA_Annual_Report.pdf
National Mapping and Resource Information Authority. (2016). Land cover classification map of the Philippines (2016) [Raster dataset]. NAMRIA. https://www.namria.gov.ph/jdownloads/Annual_Report/2016%20NAMRIA%20Annual%20Report.pdf
Peñaranda, F., Reyes, J., & Dela Cruz, T. (2020). Multi-temporal Landsat analysis of forest cover changes in Luzon, Philippines. Philippine Journal of Science, 149(4), 895–908. https://doi.org/10.37110/pjs2020.149.4.895
Perez, C., Santos, M., & Villanueva, L. (2020). Geospatial modeling of forest cover change in Luzon, Philippines: A quantitative analysis. Asia-Pacific Journal of Environmental Research, 27(3), 205–220.
Perez, G. J., Comiso, J. C., Aragones, L. V., Merida, H. C., & Ong, P. S. (2020). Reforestation and deforestation in Northern Luzon, Philippines: Critical issues as observed from space. Forests, 11(10), 1071. https://doi.org/10.3390/f11101071
Philippine Information Agency. (2023). CCC pushes for protection of Sierra Madre. Philippine Information Agency. https://pia.gov.ph/ccc-pushes-for-protection-of-sierra-madre/
Philippine Space Agency (PhilSA) & Department of Environment and Natural Resources (DENR). (2023). Use of space data for monitoring national reforestation programs. https://philsa.gov.ph/news/philsa-denr-to-use-space-data-to-create-natural-resources-database-monitor-natl-reforestation-program/
Philippine Star. (2025, February 24). DENR: Forested lands down to 7 million hectares. https://www.philstar.com/nation/2025/02/24/2423707/denr-forested-lands-down-7-million-hectares
Philippine Star. (2025, November 12). Sierra Madre losing 9,000 hectares of forest cover each year — Haribon. https://www.philstar.com/climate-and-environment/2025/11/12/2486728/sierra-madre-losing-9000-hectares-forest-cover-each-year-haribon
Sazon, M., Cruz, R., & Villanueva, E. (2020). Municipal-level assessment of forest loss in Sierra Madre, Philippines. Philippine Journal of Environmental Science, 25(1), 33–47.
Journal of Threatened Taxa. (2021). Forecasting forest loss using historical trends: Case studies from tropical regions. Journal of Threatened Taxa, 13(12), 18945–18957. https://doi.org/10.11609/jott.6521.13.12.18945-18957
United Nations Framework Convention on Climate Change. (n.d.). National communications and biennial reports. UNFCCC. United Nations Framework Convention on Climate Change | UNFCCC
Downloads
Published
Issue
Section
License
Copyright (c) 2026 Crisa Beth S. Saga, Sannyli R. Templanza, Daniela M. Bandoquillo (Author)

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.