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Land Use Change Impacts on Water Erosion in Rwanda

Author

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  • Jean de Dieu Nambajimana

    (Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
    University of Chinese Academy of Sciences, Beijing 100049, China)

  • Xiubin He

    (Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China)

  • Ji Zhou

    (Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China)

  • Meta Francis Justine

    (University of Chinese Academy of Sciences, Beijing 100049, China
    Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China)

  • Jinlin Li

    (Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
    University of Chinese Academy of Sciences, Beijing 100049, China)

  • Dil Khurram

    (Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
    University of Chinese Academy of Sciences, Beijing 100049, China)

  • Richard Mind’je

    (University of Chinese Academy of Sciences, Beijing 100049, China
    State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China)

  • Gratien Nsabimana

    (Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
    University of Chinese Academy of Sciences, Beijing 100049, China)

Abstract

Rwanda has experienced accelerated soil erosion as a result of unsustainable human activities and changes in land use. Therefore, this study aimed at applying the RUSLE (Revised Universal Soil Loss Equation) model using GIS (Geographical Information System) and remote sensing to assess water erosion in Rwanda, focusing on the erosion-prone lands for the time span 2000 to 2015. The estimated mean annual soil losses were 48.6 t ha −1 y −1 and 39.2 t ha −1 y −1 in 2000 and 2015, respectively, resulting in total nationwide losses of approximately 110 and 89 million tons. Over the 15 years, 34.6% of the total area of evaluated LULC (land use/land cover) types have undergone changes. The highest mean soil loss of 91.6 t ha −1 y −1 occurred in the area changing from grassland to forestland (0.5%) while a mean soil loss of 10.0 t ha −1 y −1 was observed for grassland converting to cropland (4.4%). An attempt has been made to identify the embedded driving forces of soil erosion in Rwanda. As a result, we found that mean soil loss for Rwanda’s districts in 2015 was significantly correlated with poverty ( r = 0.45, p = 0.013), increased use of chemical fertilizers ( r = 0.77, p = 0.005), and especially was related to extreme poverty ( r = 0.77, p = 0.000). The soil conservation scenario analysis for Rwanda’s cropland in 2015 revealed that terracing could reduce the soil loss by 24.8% (from 14.6 t ha −1 y −1 to 11.7 t ha −1 y −1 ). Most importantly, the study suggests that (1) terracing integrated with mulching and cover crops could effectively control water erosion while ameliorating soil quality and fertility, and (2) reforestation schemes targeting the rapid-growing tree species are therefore recommended as an important feature for erosion control in the study area.

Suggested Citation

  • Jean de Dieu Nambajimana & Xiubin He & Ji Zhou & Meta Francis Justine & Jinlin Li & Dil Khurram & Richard Mind’je & Gratien Nsabimana, 2019. "Land Use Change Impacts on Water Erosion in Rwanda," Sustainability, MDPI, vol. 12(1), pages 1-23, December.
  • Handle: RePEc:gam:jsusta:v:12:y:2019:i:1:p:50-:d:299748
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    References listed on IDEAS

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    Cited by:

    1. George Watene & Lijun Yu & Yueping Nie & Jianfeng Zhu & Thomas Ngigi & Jean de Dieu Nambajimana & Benson Kenduiywo, 2021. "Water Erosion Risk Assessment in the Kenya Great Rift Valley Region," Sustainability, MDPI, vol. 13(2), pages 1-31, January.

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