Beyond species richness and community composition: Using plant functional diversity to measure restoration success in jarrah forest

Standish, R.J., Gove, A.D., Grigg, A.H., Daws, M.I. and Ward, D. (2021) Beyond species richness and community composition: Using plant functional diversity to measure restoration success in jarrah forest. Applied Vegetation Science, 24 (3). Art. e12607.

Abstract

Aim

The importance of restoring ecosystem functions to native systems that have been degraded, damaged or destroyed is increasingly recognised. Yet few studies have measured the effect of restoration efforts on ecosystem functioning or the functional diversity (FD) that underpins it. Here we assessed change in FD of restored assemblages one to 25 years after the onset of post-mine restoration.

Location

Northern Jarrah (Eucalyptus marginata Donn ex Sm.) Forest bioregion of southwestern Australia.

Methods

Functional richness, evenness, divergence and dispersion were derived from five plant functional traits relevant to community reassembly. Effects of three explanatory variables (i.e. age, year restoration was initiated, and time since fire) on six response variables (i.e. four FD indices, species richness, and compositional similarity to nearby reference forest) were analysed using linear mixed models for a data set with repeated measures of plots through time (n = 810 plots), and linear models for a subset of one-time measures of different aged assemblages (i.e. space-for-time approach; n = 490 plots).

Results

Functional evenness and functional dispersion increased with age, while functional divergence and functional richness decreased with age. Functional dispersion increased with time since fire, while functional richness decreased with time since fire. Species richness decreased with age, but at 25 years, species richness was comparable to that observed in reference forest. In contrast, similarity showed no relationship with age of restored forest, and at 25 years, similarity of restored forest to reference was low compared with similarity of reference forest to itself. Three of four FD indices had not reached those of reference jarrah forest 25 years after restoration had been initiated.

Conclusions

Reassembly of FD suggests importance of environmental filtering and high functional redundancy. A longer time frame may be needed to assess FD of restored assemblages, and in the meantime, species richness is not an adequate surrogate of FD.

Item Type:	Journal Article
Murdoch Affiliation(s):	Harry Butler Institute
Publisher:	Wiley-Blackwell
Copyright:	© 2021 International Association for Vegetation Science
URI:	http://researchrepository.murdoch.edu.au/id/eprint/62362

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