To effectively combat severe gully erosion causing massive land degradation in the sedimentary terrain of Anambra State in South-Eastern Nigeria, environmental managers require an integrated conservation strategy. Which of the following combinations of methods offers the most sustainable long-term solution to stabilize active gully heads and prevent further catchment runoff damage?
- Construction of check dams and gabions combined with catchment afforestation and bamboo planting along gully floorsCevap
- BControlled bush burning across the catchment zone to clear debris followed by intensive monoculture crop farming on gully edges
- CDeep ploughing along vertical slope lines coupled with overhead sprinkler irrigation during peak rainfall periods
- DReplacement of native forest belts with drought-resistant Sahelian scrub species across the southern humid forest zone
Cevap
The most effective long-term conservation strategy combines structural engineering measures like check dams and gabions with biological measures such as catchment afforestation and bamboo planting along gully channels.
The correct answer combines mechanical controls (check dams and gabions) to slow water flow and trap sediment with biological controls (afforestation and deep-rooting bamboo) to permanently anchor soil particles and restore ecological balance in high-rainfall gully regions.
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Anahtar Kavram
Integrated Soil Conservation Methods (Mechanical and Biological Techniques)
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