Which plant functional group is most affected by forest harvesting?

Question

BlackTom AI · Accepted Answer

Mosses and lichens are particularly sensitive to the changes caused by forest harvesting because they depend on stable, humid microclimates and intact substrates that logging most directly disrupts.

1) Relevant knowledge points and concepts
- Bryophytes (mosses) and lichens are non-vascular or symbiotic organisms that often live on bark, dead wood, and shaded forest floors. They lack roots and rely on atmospheric moisture and stable shade.  
- Forest harvesting removes canopy cover, coarse woody debris, and standing trees, and alters light, temperature, humidity, and wind regimes.  
- Vascular plants (trees, shrubs, herbs, grasses) often have deeper root systems, seed banks, and faster recolonization strategies.

2) Step-by-step reasoning
- Harvesting removes the canopy → increases light, temperature fluctuations, and wind exposure at ground and bole level.  
- Removal of dead wood and standing trees eliminates the primary substrates (logs, snags, bark) on which many mosses and lichens grow.  
- Physical machinery compacts soil and crushes bryophyte mats and lichen thalli directly.  
- Changed microclimate and lost substrates make survival and re-establishment difficult for mosses and lichens, while many vascular plants can regenerate from seeds or resprout.

3) Calculations / intermediate steps
- Not applicable (no numeric calculation required). Instead, the logical intermediate steps are: canopy removal → microclimate change + substrate loss → increased desiccation and habitat loss → decline in mosses and lichens.

4) Why the correct answer is correct
- Because mosses and lichens rely on the shaded, humid, and substrate-rich conditions that harvesting most directly destroys, they show the largest immediate and long-term declines compared with other plant groups.

5) Why other plant groups are less affected
- Trees are removed but can regrow from residuals or regeneration; shrubs and herbs often colonize open, disturbed sites rapidly; grasses and ferns often tolerate higher light and disturbance. These groups typically recover faster than bryophytes and lichens.

6) Conclusion
- Therefore, mosses and lichens are the plant functional group most affected by forest harvesting, which matches the provided answer: Mosses and lichens.

Which plant functional group is most affected by forest harvesting?单项选择题

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