Effects of Recreational Impacts on Soil Microbial Communities

Area of Science:

• Soil Science
• Microbiology
• Ecology

Background:

• Subalpine ecosystems are vulnerable to anthropogenic disturbance from recreational activities.
• Understanding the impact of human activities on soil microbial communities is crucial for ecosystem health.

Purpose of the Study:

• To compare the functional diversity of soil microbial communities in impacted subalpine campsites versus undisturbed areas.
• To identify specific carbon sources affected by recreational disturbance.

Main Methods:

• Utilized the Biolog method for analyzing carbon utilization profiles of soil microbial communities.
• Employed principal components analysis to assess microbial activity patterns.
• Conducted spread-plate counts to compare culturable actinomycetes, bacteria, and fungi.

Main Results:

• Microbial communities differentiated in the top 6 cm of soil, with significant differences between disturbed and undisturbed sites.
• Disturbed soils showed significantly lower utilization of total carbon sources (54%) compared to undisturbed soils (95%).
• Specific carbon substrates, including plant, invertebrate, and microbial derivatives, were not metabolized by microbial communities in disturbed sites. Actinomycete populations decreased markedly in disturbed sites.

Conclusions:

• Recreational impacts significantly alter the functional diversity and structure of soil microbial communities in subalpine campsites.
• The reduced carbon source utilization and shift in microbial populations serve as a potential indicator of soil community disturbance.
• Conservation efforts should consider the impact of recreational activities on soil microbial ecosystems.