Characterising of plant cover evolution in the Aurès region (eastern Algeria): using Landsat imagery

Abstract

A better understanding of the evolution of vegetation cover is a major concern for countries where mountain ecosystems are undergoing severe degradation. Mediterranean woodland ecosystems in general and those of Algeria in particular, are suffering from numerous types of degradation, be they climatic or anthropogenic. For this reason, and to have a better understanding of this issue and how to deal with it, we decided to carry out a study in the Aurès Mountains (eastern Algeria), where the phenomenon of degradation has a direct impact on natural resources. The evolution of the vegetation cover in the region was analysed, using remote sensing data (Landsat-type satellite images) over a 33-year period (1984-2017). A notably pronounced regressive evolution of the plant cover was attributed both to the phenomena of climate change and dieback (which particularly affected the cedar groves) and to the anthropogenic pressure exerted on the vegetation as a whole. Data sets from Landsat imagery show an decrease of dense and open forest area, -9,272.52 ha, and -12,953.30 ha respectively. It will therefore become more than necessary to take measures to protect and preserve the region's rich ecological heritage.

Keywords

• regression
• mountain ecosystems
• climate change
• anthropogenic pressure