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Which soil organism group is most sensitive to soil compaction?

  • A.Anaerobic organisms, because compaction admits more oxygen
  • B.Photosynthetic organisms, because compaction blocks the light
  • C.Spore-forming organisms, because compaction crushes their spores
  • D.Aerobic organisms, because compaction removes air-filled pores

Answer: D

Compaction collapses the larger pores that hold air, so oxygen diffusion falls and aerobes are the first to suffer. Anaerobes actually benefit, which is why compacted patches become sites of denitrification. Light never penetrates below the surface in any case.

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