A GIS approach to identify the Cork Oak Decline in M’Sila Forest (North-West of Algeria)

Ghefar Mohammed, D. Belkheir
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Abstract

The decline of cork oak trees in North-West of Algeria was supposed to be caused by a combination of primary or predisposing factors, and secondary or opportunistic factors. There is a broad consensus about the role of water scarcity and nutrients in the primary causes, given the similarity of symptoms of cork oak decline and of chronic water deficits. To identify and characterize the cork oak decline in M’sila forest, a cork oak mortality index was determined for each transience area using a GIS approach and a linear regression model formulated by analyzing the interactions between the attributes of station (competition of superior and inferior floor); and allowing a justification of cork oaks mortality. The mortality index is significantly high in the invasive shrub plots and where the Aleppo pine density is very high; in which competition for soil water between the trees and the inferior floor increases. The lowest mortality value characterized by a lower density of Aleppo pine and herbaceous inferior floor.
GIS方法识别M 'Sila森林(阿尔及利亚西北部)栓皮栎衰退
阿尔及利亚西北部栓皮栎的衰退被认为是由主要或诱发因素和次要或机会因素共同造成的。鉴于栓皮栎衰退的症状与长期缺水的症状相似,人们对缺水和营养物质在主要原因中的作用有广泛的共识。为了识别和表征M 'sila森林栓皮栎的衰退,利用GIS方法和通过分析站点属性(优劣势层竞争)之间的相互作用建立的线性回归模型,确定了每个暂态区域的栓皮栎死亡率指数;并允许为软木橡树的死亡辩护。在入侵灌丛样地和阿勒颇松密度高的地方,死亡率指数显著高;在这种情况下,树木和下层地面对土壤水分的竞争加剧。死亡率最低,以阿勒颇松密度较低和草本劣质地板为特征。
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