Abstract

Degradation of tropical forests is a major driver of the global extinction crisis. A key question is understanding the role of evolution history during forest succession in the context of forest restoration for maintaining ecosystem function and stability. This study was conducted in a fragmented forest landscape in the central highlands of Vietnam. We sampled living trees with diameters at breast height of ≥6.0 cm in nineteen 0.25 ha plots to evaluate forest community structure changes over two early successional stages (<10 years and 10–20 years old) after abandonment and old-growth. We used both statistically metric and nonmetric analyses to examine correlations of community composition during successional stages and along elevational gradients. We found that (i) significant differences existed in the structural compositions between early successional forests and old-growth forests, but did not exist within early successional forests; (ii) the phylogenetic structure shifted from overdispersion to clustering with increasing successional ages; and (iii) above-ground biomass (AGB), representing ecosystem functioning, significantly increased from early-to-late successional stages, but did not correlate with phylogenetic diversity or elevation. Our results revealed that the forest community structure was strongly affected by degradation, particularly AGB and phylogenetic structure. These findings have clear implications for sustaining biodiversity persistence and ecosystem functioning in human-modified landscapes in the study region.

Highlights

  • Degraded tropical forests due to anthropogenic disturbance are rapidly expanding in the tropics at alarming rates [1,2]

  • A total of 1198 (199.00 ± 54.38) individual trees belonging to 103 species, 79 genera, and 40 families were recorded in six early successional forest plots, less than 10 years old of succession (Table 1)

  • Fitting the structural community variables with elevation to the Non-metric multidimensional scaling (NMDS) plot, the results showed a significant correlation with p-values of

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Summary

Introduction

Degraded tropical forests due to anthropogenic disturbance are rapidly expanding in the tropics at alarming rates [1,2]. Considering that forest resilience in maintaining its function and structure is associated with history, evolutionary pressures, and previous extinction, conservation actions should target entire communities, rather than species [4]. Few studies quantified the relationship between biodiversity and ecosystem functions (e.g., phylogenetic diversity and forest productivity) during successional process in tropical forests [3,6,8]. This approach allows scientists to better understand community assembly by considering the long-term evolutional history of coexisting species [9]

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