Resource Details

Establishment of tree seedlings in the understory of restoration plantations: natural regeneration and enrichment plantings

Literature: Journal Articles

Bertacchi, M. I. F., Amazonas, N. T., Brancalion, P. H., Brondani, G. E., Oliveira, A., Pascoa, M. A., & Rodrigues, R. R. (2016). Establishment of tree seedlings in the understory of restoration plantations: natural regeneration and enrichment plantings. Restoration Ecology, 24(1), 100-108.

Contact Info

pedrob@usp.br

Affiliations

Restoration Ecology, The Journal of the Society for the Ecological Restoration 

Link(s)

http://onlinelibrary.wiley.com/doi/10.1111/rec.12290/suppinfo

Description

In this study, Bertacchi et al. investigated how seedling establishment is affected in the understory of restoration sites of different ages (10, 22 and 55 year-old) within the Atlantic Forest southeastern region, and assessed some of the environmental microsite conditions that influenced the stand dynamics process. 
 
In order to test how different microsite conditions affect seedling establishment, a seed addition experiment was performed on each of the study sites. Parameters of density, diversity, seedling emergence, survival and biomass were compared.
 
With respect to species diversity, the 55-year-old forest contained the highest number of species per plot, while the other two sites showed no difference in species number per restoration plot. Moreover, regenerating seedling density was highest in the oldest site, following by the 22-year-old forest, and the youngest site with the lowest seedling establishment density. Both results supported the author’s set out hypothesis based on the assumption of better microsite conditions for seedling establishment and higher seed deposition in older sites.
 
Seedling emergence was similar among restoration sites, but survival differed and was lower at the oldest plantation, that can be explained by greater canopy openness in younger forest and higher pathogens incidence in older sites, which is favored by low sun radiation and high soil moisture conditions. Total biomass differed among sites and was higher in seedlings that grew in the youngest restoration plantation. 
 
The authors conclude indicating that understory of young restoration plantations provides suitable microsite conditions at the early establishment phases for enrichment planting. Additionally, older forest influence a greater species diversity and density due to the recruitment capacity. Finally, it was found that there is a positive correlation between canopy coverage and seedling mortality, and a negative correlation between canopy coverage and total dry biomass per seedling.
 

Geographical Region

  • Coastal Atlantic South America
  • Country

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