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Logging and fire regimes alter plant communities.

Elle J Bowd¹, David B Lindenmayer¹, Sam C Banks¹

¹Fenner School of Environment and Society, The Australian National University, Canberra, Australian Capital Territory, 2601, Australia.

Ecological Applications : a Publication of the Ecological Society of America

|February 8, 2018

Summary

Altered disturbance regimes, like fires and logging, significantly impact plant communities. Multiple fires harm on-site seeding species, while logging favors them but harms resprouting species like tree ferns.

Keywords:

Eucalyptus regnans clearcut logging disturbance regimes plant functional traits post-disturbance environment species composition wildfire

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Area of Science:

Ecology
Forestry
Conservation Biology

Background:

Disturbances are critical in shaping plant communities, influencing their composition, structure, and function.
Plant functional traits, such as life forms and reproductive strategies, are vital for community resilience against disturbances.
Global change is altering natural disturbance regimes, potentially exceeding the adaptive capacity of plant traits and compromising ecosystems.

Purpose of the Study:

To investigate the effects of multiple disturbances (fire, clearcut logging, salvage logging) on vascular plant community composition and functional traits.
To quantify how disturbance type, intensity, and frequency influence plant community dynamics in Mountain Ash forests.
To understand the implications for ecosystem function under changing disturbance regimes.

Main Methods:

Studied wet sclerophyll Mountain Ash (Eucalyptus regnans) forests in southeastern Australia.
Quantified plant community composition and functional traits (life forms, reproductive strategies).
Assessed the impact of fire, clearcut logging, and salvage logging on these communities.

Main Results:

Clearcut and salvage logging, along with the number of fires, significantly altered plant community composition and functional traits.
Multiple fires reduced populations of on-site seeding species (e.g., Eucalyptus regnans, Pomaderris aspera, Acacia dealbata).
Logging promoted on-site seeder species but significantly decreased resprouting species like tree ferns (Dicksonia antarctica, Cyathea australis).

Conclusions:

Altered disturbance regimes have profound effects on plant community structure and function.
Understanding these impacts is crucial for biodiversity conservation in the face of increasing global environmental change.
Management strategies must consider the differential effects of various disturbances on plant reproductive strategies to maintain ecosystem resilience.