[Campbell Biology P.676] Based on the information provided, particularly the 'WHAT IF?' prom... | Practice Question

Based on the information provided, particularly the 'WHAT IF?' prompt, how might the continued presence of Polytrichum moss in sandy soils affect the succession of other plant species that typically colonize these areas?

  • A: It would likely facilitate the establishment and growth of a broader range of plant species by increasing nitrogen availability in the soil.
  • B: It would inhibit the colonization of other plant species by aggressively outcompeting them for limited nitrogen resources.
  • C: It would primarily lead to a significant increase in soil acidity, making the environment unsuitable for most subsequent colonizers.
  • D: It would have little long-term effect on plant succession, as the nitrogen it retains would eventually be lost through other pathways.

Explanation

The text concludes that Polytrichum moss 'greatly reduced the loss of nitrogen by leaching in this ecosystem,' retaining 'over 95% of the 10.5 kg/ha of total nitrogen inputs.' By significantly reducing nitrogen loss, the moss effectively increases the nitrogen available in the soil over time. This increased nutrient availability would likely support a wider array of plant species in colonizing the sandy soils, as nitrogen is a 'nutrient required for normal plant growth' and soils are 'often low in nitrogen.'