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<p>Soil moisture dynamics are critical for agriculture, water resources, and climate resilience in Ethiopia, influencing crop yields, water availability, and ecosystem health. Assessing soil moisture variability in relation to land use and cover&#xa0;(LULC) changes is essential for effective ecosystem conservation and climate change adaptation, ensuring sustainable development and resilience to environmental challenges. This study examines the impact of LULC changes on soil moisture variability in Southwestern Ethiopia over 30&#xa0;years (1994–2024). Utilizing Landsat Thematic Mapper (1994), Enhanced Thematic Mapper Plus (2004), and Operational Land Imager/Thermal Infrared Sensor (2024) data, LULC changes were analyzed using supervised classification approach with the Maximum Likelihood Algorithm. The classification process was conducted using ERDAS Imagine 2015 software. In addition, vegetation health and soil moisture dynamics were assessed through the Normalized Difference Vegetation Index (NDVI) and the Normalized Difference Moisture Index (NDMI). Results reveal a significant increase in cultivated land from 3595.2 km<sup>2</sup> (42.0%) to 6183.3 km<sup>2</sup> (72.2%), with a corresponding decrease in forest cover from 3119.2 km<sup>2</sup> (36.4%) to 2030.4 km<sup>2</sup> (23.7%).This significant shift indicates intensive agricultural expansion at the expense of forest cover, highlighting increased land conversion pressures. NDVI values dropped from 0.71 in 1994 to 0.52 in 2024, this decline in NDVI values signifies a substantial reduction in vegetation cover and density over the 30-year period. The NDMI results indicated a decrease in peak moisture levels and average soil moisture, emphasizing a growing trend of intensified dryness. This soil moisture decline is attributed to factors such as reduced precipitation, increased evaporation, and changes in LULC. The conversion of forest land to cultivation led to a significant decrease in NDMI values, reflecting a reduction in soil moisture due to the loss of forest cover and increased evapotranspiration from agricultural activities. A strong correlation (R<sup>2</sup> = 0.98) between NDVI and NDMI highlights that higher vegetation cover is associated with higher soil moisture. Therefore, the study highlights the profound impact of land use and land cover changes on soil moisture, underscoring the urgent need for sustainable land management practices. These practices are critical to combat environmental degradation, improve soil moisture retention, and bolster ecosystem resilience, ensuring a sustainable and climate-resilient future.</p>

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Evaluating the impact of land use and land cover change on soil moisture variability using GIS and remote sensing technology in southwestern Ethiopia

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Mitiku Badasa Moisa,
  • Zenebe Reta Roba,
  • Sanju Purohit,
  • Kiros Tsegay Deribew,
  • Dessalegn Obsi Gemeda

摘要

Soil moisture dynamics are critical for agriculture, water resources, and climate resilience in Ethiopia, influencing crop yields, water availability, and ecosystem health. Assessing soil moisture variability in relation to land use and cover (LULC) changes is essential for effective ecosystem conservation and climate change adaptation, ensuring sustainable development and resilience to environmental challenges. This study examines the impact of LULC changes on soil moisture variability in Southwestern Ethiopia over 30 years (1994–2024). Utilizing Landsat Thematic Mapper (1994), Enhanced Thematic Mapper Plus (2004), and Operational Land Imager/Thermal Infrared Sensor (2024) data, LULC changes were analyzed using supervised classification approach with the Maximum Likelihood Algorithm. The classification process was conducted using ERDAS Imagine 2015 software. In addition, vegetation health and soil moisture dynamics were assessed through the Normalized Difference Vegetation Index (NDVI) and the Normalized Difference Moisture Index (NDMI). Results reveal a significant increase in cultivated land from 3595.2 km2 (42.0%) to 6183.3 km2 (72.2%), with a corresponding decrease in forest cover from 3119.2 km2 (36.4%) to 2030.4 km2 (23.7%).This significant shift indicates intensive agricultural expansion at the expense of forest cover, highlighting increased land conversion pressures. NDVI values dropped from 0.71 in 1994 to 0.52 in 2024, this decline in NDVI values signifies a substantial reduction in vegetation cover and density over the 30-year period. The NDMI results indicated a decrease in peak moisture levels and average soil moisture, emphasizing a growing trend of intensified dryness. This soil moisture decline is attributed to factors such as reduced precipitation, increased evaporation, and changes in LULC. The conversion of forest land to cultivation led to a significant decrease in NDMI values, reflecting a reduction in soil moisture due to the loss of forest cover and increased evapotranspiration from agricultural activities. A strong correlation (R2 = 0.98) between NDVI and NDMI highlights that higher vegetation cover is associated with higher soil moisture. Therefore, the study highlights the profound impact of land use and land cover changes on soil moisture, underscoring the urgent need for sustainable land management practices. These practices are critical to combat environmental degradation, improve soil moisture retention, and bolster ecosystem resilience, ensuring a sustainable and climate-resilient future.