In low-rainfall regions, massive shifting sand dunes frequently appear close to human settlements, necessitating afforestation methods. These techniques comprise___________?
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Answer: C. Both a & b
Explanation
Stabilizing shifting sand dunes requires both mechanical barriers and biological protection measures. Grid or parallel brushwood barriers protect young seedlings from burial or exposure. Protecting afforestation sites from grazing livestock ensures the long-term survival of plants. Shifting sand dunes create severe hazards for infrastructure and agricultural lands nearby. Local shrub materials are pegged into complex patterns to reduce surface wind velocities. Biotic interference from roaming livestock can quickly destroy fragile newly established vegetation.
Arid regions rely on dune stabilization to prevent desertification from engulfing rural settlements. Successful afforestation projects restore degraded landscapes and improve local microclimates significantly. Engineering and biology must work together to tame highly mobile desert sand dunes. Option A describes mechanical sand-fixing barriers but ignores the necessity of biological protection. Option B covers biotic protection against grazing but omits essential mechanical wind barriers. Option D is incorrect because both listed management techniques are necessary practices.
- Subject
- Agriculture
- Category
- Agriculture
- Topic
- —
- Difficulty
- medium
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