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Lucas-Borja M.E.,University of Castilla - La Mancha | Madrigal J.,Japan Forestry and Forest Products Research Institute | Madrigal J.,Sustainable Forest Management Forest Institute | Candel-Perez D.,University of Castilla - La Mancha | And 10 more authors.
Forest Ecology and Management | Year: 2016

Prescribed fire has been widely used as a fuel reduction tool and silvicultural treatment in Mediterranean forest ecosystems. However, other than the fact that fire may alter microsite conditions, little is known about the impact of prescribed burning on the natural regeneration of Spanish black pine (Pinus nigra Arn. ssp. salzmanii). In this study, we compared the effects of post dispersal seed predation, prescribed burning and vegetation treatment (brushing) on initial recruitment of Spanish black pine in both pure and mixed (with maritime pine, Pinus pinaster Ait.) stands during one year (2014) in the Cuenca Mountains (central-eastern Spain). Seedling recruitment in both pure and mixed stands was negatively affected by prescribed burning but was improved by the vegetation treatment. Post dispersal seed protection was an important factor for seed emergence and early survival success. Prescribed burning must be carefully planned in forest management aimed at regeneration. The influence of fire on natural regeneration should be taken into account for developing guidelines for the management of black pine forests, mainly in the Mediterranean Basin. © 2016 Elsevier B.V.

Dehane B.,Abou Bekr Belkaid University Tlemcen | Madrigal J.,Japan Forestry and Forest Products Research Institute | Madrigal J.,Sustainable Forest Management Forest Institute | Hernando C.,Japan Forestry and Forest Products Research Institute | And 4 more authors.
Journal of Fire Sciences | Year: 2015

This study proposes new bench-scale protocols for evaluating the flammability of bark and its involvement in resistance of trees to fire. Samples of cork from Algerian oak forests (Quercus suber) were selected for flammability testing. A mass loss calorimeter device, arranged in the standard horizontal configuration, was used to determine Heat Release Rate and temperatures. A calibrated epiradiator, arranged in a vertical configuration (to resemble field conditions), was used to determine lethal temperatures in living tissues and to assess the inter-device reproducibility of the data. Both protocols showed good repeatability and reasonable reproducibility. The time to reach lethal temperatures beside living tissues was more than 2 min in all cases and the average time was 230 s. The resistance of cork to fire increased with the thickness of the material, showing that trees in which the cork is less than 3 cm thick are most vulnerable to fire. The importance of corkback tissue in the flammability of cork is also highlighted, indicating important differences in the flammability of industrially processed cork and natural cork. The proposed protocols can be implemented using other devices (i.e. cone calorimeter) to obtain more information about the flammability of different types of tree bark, fire resistance and heat transfer during wildfire. © 2015 The Author(s).

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