In southeastern Nigeria, heavy equatorial rainfall acting on deeply weathered, leached Ferrallitic soils frequently triggers catastrophic gully erosion following vegetation removal. Which of the following soil conservation strategies is most suitable for halting active gully extension and re-stabilizing these degraded slopes?
- Establishing tree plantations and constructing structural check dams along gully channelsCevap
- BPracticing deep plowing parallel to slope gradients to increase rainwater infiltration
- CConducting annual controlled bush burning to clear vegetation debris from drainage paths
- DShifting tree crops to northern drylands to allow natural rock weathering processes to rebuild topsoil
Cevap
Establishing tree plantations and constructing structural check dams along gully channels
Establishing tree cover (afforestation) anchors loose, deeply weathered Ferrallitic subsoils with root networks and intercepts heavy rainfall, while check dams physically obstruct channelized runoff, reducing its scouring energy and trapping eroded sediment to heal active gullies.
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Anahtar Kavram
Soil Conservation Measures for Gully Erosion in Nigeria