An assessment of the spatial variability of basal area in a terrain covered by Mediterranean woodlands

Spatial patterns of Mediterranean woodlands are largely unknown. An exploratory analysis of the spatial structure of basal area was carried out in this type of community. Specifically, an area of non-disturbed woodlands located in the north-east of the Iberian peninsula was analysed. Direct and indirect evidences for the hypothesis stating that environmental factors lead to the establishment of spatial patterns on the basal area of non-disturbed Mediterranean woodlands were investigated. The results showed that the variability of this parameter occurs within really short spatial intervals (of less than 100 m) and neither radiation nor the slope seemed to have an important effect on it. In consequence, results did not support the previously mentioned hypothesis. Among others, long term effects of forest management, an uneven presence of relief conditions and a complex dynamics of basal area within plots were suggested as explanations for the results found. Finally, some recommendations and practical advises were set for future inventories and studies of spatial patterns in Mediterranean woodlands. © 2000 Elsevier Science B.V. All rights reserved.