Effect of burnt wood removal on the natural regeneration of Pinus halepensis after fire in a pine forest in Tus valley (SE Spain) |
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| Institution: | 1. Stand Management Cooperative School of Forest and Environmental Sciences University of Washington Box 352100 Seattle, WA 98195, United States;2. USDA Forest Service PNW Research Station Olympia, WA, United States;3. Department of Forest Resources, University of Minnesota, St. Paul, MN, United States;4. Weyerhaeuser Company Springfield, OR, United States;5. Forest Engineering, Resources & Management, Oregon State University Corvallis, OR, United States;1. Colorado State University, Department of Forest and Rangeland Stewardship, Fort Collins, CO 80523-1472, USA;2. Colorado Forest Restoration Institute, Colorado State University, Fort Collins, CO 80523-1472, USA;1. Mediterranean Center for Environmental Studies (CEAM Foundation), Joint Research Unit, University of Alicante-CEAM, University of Alicante, 03690 Alicante, Spain;2. Department of Ecology, University of Alicante, 03690 Alicante, Spain;3. Facultad de Ciencias Agropecuarias, Universidad Laica Eloy Alfaro de Manabí, Ciudadela Universitaria, Av. Circunvalación - Vía a San Mateo, 130802 Manta, Manabí, Ecuador;4. Department of Evolutionary Biology, Ecology and Environmental Sciences, University of Barcelona, Av. Diagonal 643, 08028 Barcelona, Spain;1. Department of Crop and Forest Sciences – AGROTECNIO Center, University of Lleida, Avda. Rovira Roure 191, 25198 Lleida, Spain;2. Siberian Federal University, st. L. Prushinskoy 2, 660075 Krasnoyarsk, Russia;3. Institute of Botany, University of Basel, Schönbeinstrasse 6, CH-4056 Basel, Switzerland;4. Council for Agricultural Research and Economics, Research Centre for Agriculture and Environment (CREA), Rome, Italy;5. Department of Plant and Environmental Sciences, Weizmann Institute of Science, 234 Herzl Street, Rehovot 7610001, Israel;1. Department of Agricultural, Forest and Food Sciences (DISAFA), University of Torino, largo Paolo Braccini, 2, 10095 Grugliasco, TO, Italy;2. Department of Land, Environment, Agriculture and Forest (TESAF), University of Padova, viale dell’Università, 16, 35020 Legnaro, PD, Italy |
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| Abstract: | To determine the effect of burnt tree removal on post-fire natural regeneration of Pinus halepensis, two 2 500 m2 areas were selected six months after the fire in a totally destroyed mature (>70 years) pine forest. In one area, all the trees were cut down and removed 10 months after the fire and, in the other, all the trees were left standing (control). In each area, 20 permanent plots of 20 m2 each were randomly placed, and all seedlings emerging within them labeled by individual numbered plastic tags. Emergence, mortality, density and growth (height) of 6649 P. halepensis seedlings were monitored during the first four post-fire years. Seedling emergence was concentrated in the first post-fire autumn–winter period. No positive effect on seedling emergence was detected as a consequence of burnt trunk dragging and subsequent turning over of soil. Wood removal produced an immediate average seedling mortality of 33%, and notably increased seedling mortality during the subsequent summer, probably due to increased exposure of seedlings to sunlight and the possible debilitation of many individuals by mechanical contact during burnt wood removal. A negative correlation of pine seedling mortality with height was detected, which increased significantly on wood removal in the third post-fire year. That is, short seedlings (<10 cm) in treated plots were the most likely to die during this period. In spite of the detrimental effect of wood removal on sapling survival, seedling density four years after fire in the cleared area was large (3.3 seedlings/m2). Wood removal treatment reduced seedling growth: seedling height was significantly higher in the control stand, and differences in seedling height growth rate became particularly noticeable in the fourth post-fire year. The results denote that traditional wood removal practices do not threaten natural post-fire P. halepensis re-establishment if initial seedling density is large enough. However, further studies focused on wood removal effects on the final tree development level and other ecological aspects are necessary to choose adequate post-fire forest management. |
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