Water, Air, & Soil Pollution

, 225:1992

Random Forests Analysis: a Useful Tool for Defining the Relative Importance of Environmental Conditions on Crown Defoliation

  • Marcello Vitale
  • Chiara Proietti
  • Irene Cionni
  • Richard Fischer
  • Alessandra De Marco
Article

DOI: 10.1007/s11270-014-1992-z

Cite this article as:
Vitale, M., Proietti, C., Cionni, I. et al. Water Air Soil Pollut (2014) 225: 1992. doi:10.1007/s11270-014-1992-z

Abstract

Defoliation is one of the most important parameters monitored in the International Cooperative Programme on Assessment and Monitoring of Air Pollution Effects on Forests (ICP Forests). Defoliation is an indicator for forest health and vitality. Conventional statistical analysis shows weak or not significant correlations between tree crown defoliation and climatic conditions or air pollution parameters, because of its high variability. The study aims to evaluate the most important factors among climatic, pollutants (Nox and NHy) and stand parameters affecting crown defoliation of the main European tree species (Fagus sylvatica, Picea abies, Quercus ilex, Pinus sylvestris and Quercus petraea) through application of a new and powerful statistical classifier, the random forests analysis (RFA). RFA highlighted that tree crown defoliation was mainly related to age in P. abies, to geographic location in F. sylvatica and to air pollution predictors in Q. ilex, while it was similarly linked to meteorological and air pollution predictors in P. sylvestris and Q. petraea. In this study, RFA has proven to be, for the first time, a useful tool to discern the most important predictors affecting tree crown defoliation, and consequently, it can be used for an appropriate forest management.

Keywords

DefoliationN depositionCritical loadsRandom forests analysis

Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Marcello Vitale
    • 1
  • Chiara Proietti
    • 1
  • Irene Cionni
    • 2
  • Richard Fischer
    • 3
  • Alessandra De Marco
    • 2
  1. 1.Department of Environmental BiologySapienza University of RomeRomeItaly
  2. 2.Italian National Agency for New Technologies, Energy and the Environment (ENEA)RomeItaly
  3. 3.Thünen Institute for World ForestryHamburgGermany