Modeling sapling distribution over time using a functional predictor in a generalized additive model

Daniel Moreno-Fernández, Nicole H. Augustin, Fernando Montes, Isabel Cañellas, Mariola Sánchez-González

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
39 Downloads (Pure)

Abstract

Key message: The effect of adult trees on sapling density distribution during the regeneration fellings is determined in aPinus sylvestrisL. Mediterranean forest using generalized additive models. Context: Spatial pattern of adult trees determines the number of new individuals after regeneration fellings, which modify the light and air temperature under tree canopy. Aims: We proposed a novel spatiotemporal model with a functional predictor in a generalized additive model framework to describe nonlinear relationships between the size of the adult trees and the number of saplings of P. sylvestris and to determine if the spatial pattern of the number of saplings remained constant or changed in time. Methods: In 2001, two plots (0.5 ha) were set up in two phases of regeneration fellings under the group shelterwood method. We mapped the trees and saplings and measured their diameter and height. The inventories were repeated in 2006, 2010, and 2014. Results: We found a negative association between the diameter of adult trees and number of saplings up to 7–8 m. Beyond these distances, the diameter of adult trees was not associated with the number of saplings. Our results indicate that the spatial pattern of the number of saplings remained quite constant in time. Conclusion: The generalized additive models are a flexible tool to determine the distance range of inhibition of saplings by adult trees.

Original languageEnglish
Article number9
Number of pages14
JournalAnnals of Forest Science
Volume75
Issue number1
Early online date14 Jan 2018
DOIs
Publication statusPublished - 1 Mar 2018

Keywords

  • Edge effect
  • Intra-specific competition
  • Mediterranean areas
  • Mountain forest
  • Shade tolerance

ASJC Scopus subject areas

  • Forestry
  • Ecology

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