GIS Reveals Forest Loss in Onigambari Reserve

Nigeria’s forests are vanishing at an alarming rate, with deforestation threatening biodiversity, climate stability, and local livelihoods. At APEARE, we believe

Nigeria’s forests are vanishing at an alarming rate, with deforestation threatening biodiversity, climate stability, and local livelihoods. At APEARE, we believe that data-driven advocacy is key to protecting Nigeria’s forest landscape. One of our flagship initiatives, originally developed as a graduate research project, offers a sobering look at the scale and drivers of forest degradation over nearly three decades—from 1984 to 2013.Using satellite imagery and Geographic Information Systems (GIS), the research tracked land use and vegetation changes across the reserve. The findings reveal extensive forest loss, driven primarily by agricultural expansion, logging, and population growth. Between 1984 and 2013, vast portions of forest were cleared and replaced by farmland, settlements, and degraded landscapes.
Onigambari ClassificationThe study also applied the Normalized Difference Vegetation Index (NDVI) to quantify vegetation health, showing a steady decline in canopy cover and ecosystem vitality.

The implications are profound. Forests in Nigeria, like those in other tropical regions, serve as carbon sinks, biodiversity hotspots, and sources of food, medicine, and income for millions.  Yet, the country has been losing approximately 400,000 hectares of forest annually, with reforestation efforts lagging far behind. If this trend continues, Nigeria’s remaining forest cover could vanish within a generation.2013-12-26 15.32.40
The Onigambari case study highlights a critical gap in forest monitoring. Many deforestation estimates in Nigeria rely on broad generalizations or outdated maps, failing to reflect local realities. This research bridges that gap by offering empirical evidence and spatial analysis, providing policymakers and conservationists with actionable insights. Key findings include:

  • A significant reduction in forest cover over 29 years, with clear patterns of land conversion.
  • Strong correlation between population growth and deforestation in the study area.
  • Climatic variations exacerbating forest degradation, especially during dry seasons.
  • Lack of effective forest management and enforcement contributing to unchecked exploitation.

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The study calls for urgent strategies to mitigate deforestation, including:

  • Strengthening forest governance and enforcement of conservation laws.
  • Promoting sustainable land use practices and agroforestry.
  • Enhancing community participation in forest stewardship.
  • Expanding the use of GIS and remote sensing for regular forest monitoring.

As Nigeria grapples with climate change and environmental degradation, this research underscores the need for data-driven interventions. Forests are not just ecological assets—they are pillars of resilience, equity, and sustainability. Protecting them requires coordinated action across government, academia, and civil society.

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