Recovery of aboveground biomass, species richness and composition in tropical secondary forests in SW Costa Rica

Florian Oberleitner, Carola Egger, Sarah Oberdorfer, Stefan Dullinger, Wolfgang Wanek, Peter Hietz (Corresponding author)

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Abstract

Tropical secondary forests comprise about half of the world’s tropical forests and are important as carbon sinks and to conserve biodiversity. Their rate of recovery varies widely; however, particularly older secondary forests are difficult to date so that the recovery rate is uncertain. As a consequence, factors affecting recovery are difficult to analyse. We used aerial surveys going back to 1968 to date 12 secondary forests in the wet tropics of SW Costa Rica and evaluated the recovery of aboveground biomass, tree species richness and tree species composition in relation to nearby old-growth forests and previous land use. To confirm the validity of the space-for-time substitution, the plots were re-censused after four years. We found fast rates of aboveground biomass accumulation, especially in the first years of succession. After 20 years AGB had reached c. 164 Mg/ha equivalent to 52% of the biomass in old-growth forests in the region. Species richness increased at a slower pace and had reached c. 31% of old-growth forests after 20 years. Recovery rates differed substantially among forests, with biomass at least initially recovering faster in forests after clearcuts whereas species numbers increased faster in forests recovering from pastures. Biomass recovery was positively related to the forest cover in the vicinity and negatively to species richness, whereas species richness was related to soil parameters. The change during the four years between the censuses is broadly in line with the initial chronosequence. While the recovery of tropical secondary forests has been studied in many places, our study shows that various environmental parameters affect the speed of recovery, which is important to include in efforts to manage and restore tropical landscapes.
Original languageEnglish
Article number118580
Number of pages9
JournalForest Ecology and Management
Volume479
DOIs
Publication statusPublished - 1 Jan 2021

Austrian Fields of Science 2012

  • 106026 Ecosystem research
  • 106022 Microbiology

Keywords

  • secondary forest
  • aboveground biomass accumulation
  • tropical rainforest
  • tree species richness
  • land use
  • forest succession
  • Tree species richness
  • Aboveground biomass accumulation
  • Forest succession
  • Secondary forest
  • Land use
  • Tropical rainforest

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