Aug 31, 2019

Spatio-temporal analysis of oak decline process in open woodlands: A case study in SW Spain

Journal of Environmental Management
Jesús Fernández-HabasBegoña Abellanas

Abstract

This study aims to characterize at landscape level the spatio-temporal dynamics of a massive oak decline that is occurring in dehesas ecosystems. We are looking at possibilities of matching with Phytophthora disease behavior, a harmful disease detected in the studied area, in order to interpret its implications within the context of the disease management. Spatial locations of affected trees from 2001, 2009 and 2016 identified through photointerpretation were analyzed with the inhomogeneous Ripley's K-function to assess their spatial pattern. Multivariate Adaptive Regression Splines (MARS), a non-parametric data mining method, was used to investigate the influence of a range of landscape descriptors of different nature on the proneness to oak decline, using the location of affected trees in comparison with that of healthy spots (points randomly extracted from areas covered by healthy trees). Affected trees showed a strong clustering pattern that decreased over time. The reported spatial patterns align with the hypothesis of Phytophthora cinnamomi Rands. being the main cause of oak decline in Mediterranean forests. Location of affected trees detected in different years was found to be spatially related, suggesting the implicatio...Continue Reading

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Mentioned in this Paper

Study
Phytophthora cinnamomi
Patterns
Trees (plant)
Quercus
Spatial Distribution
Molecular_function
Substance Abuse Problem
Spatio-Temporal Analysis
Description

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