Fire affects soil organic matter and the emergence of Pinus radiata seedlings
These results present great interest for the knowledge of fire effects and the regeneration capacity of the ecosystems, which is essential to minimise the long-term fire impacts.
This study integrates thermal analysis of soil with tests of fire effects on Pinus radiata seeds germination and field seedling emergence in P. radiata plantations. The consequences of fire intensity P. radiata plantation regeneration can be predicted from the results.
This study aims to identify the effects of fire on soil organic matter and emergence of P. radiata seedlings in a stand in NW Spain and to test the response of seeds from two provenances of P. radiata to smoke and heat.
Burnt, unburnt and laboratory-heated samples of dry soil were analysed in a differential scanning calorimeter. Based on the comparison between heat released during the combustion of the organic matter of these samples, we estimated the fire severity. Early emergence of P. radiata seedlings was recorded in the field after fire. Finally, the effects of fire on seeds germination were tested in the laboratory.
The limited loss of soil organic matter indicated that the fire had been of low severity and that the temperatures reached during the fire remained below the ignition temperatures of soil organic matter. The germination rate was high in controls and the lowest fire severities but decreased with fire intensity. The two provenances differed in their response to fire intensity. Seedling emergence was moderate and varied over time.
The intensity of the investigated fire remained moderate, with a limited loss of soil organic matter. It limited seedling germination and emergence. Nevertheless, despite the scarce seedling emergence observed in the field, re-establishment of the population was possible.
KeywordsEmergence Germination P. radiata Provenance Soil properties Wildfire
The authors are grateful to D. Arán, R. Álvarez and A. Muñoz for help with the fieldwork and to editors and anonymous reviewers for their valuable suggestions. Some data of this study correspond to the final year project carried out by M. del Valle. The study formed part of projects PIEGAL (10MDS200007PR) and LISVAPES (EM2013/031) financed by the Government of Galicia and the project GESFIRE (AGL2013-48189-C2-R) financed by the Minister of Economy and Competitiveness, Government of Spain.
- De la Rosa JM, González-Pérez JA, González-Vázquez R, Knicker H, López-Capel E, Manning DAC, González-Vila FJ (2008) Use of pyrolysis/GC–MS combined with thermal analysis to monitor C and N changes in soil organic matter from a Mediterranean fire affected forest. Catena 74:296–303CrossRefGoogle Scholar
- Díaz-Fierros F, Benito E, Vega J, Castelao A, Soto B, Pérez R, Taboada T (1990). Solute loss and soil erosion in burnt soil from Galicia (NW Spain). In: Fire in Ecosystem Dynamics 1:103–116Google Scholar
- EUROSTAT (2011) Forestry in the EU and in the world. A statistical portrait. Office of the European Union. Luxembourg. 107 ppGoogle Scholar
- Keeley JE (1994) Seed germination patterns in fire prone Mediterranean-climate regions. In: Arroyo MTK, Zedler PH, Fox MD (eds) Ecology and biogeography of Mediterranean ecosystems in Chile. California and Australia. Springer Verlag, New York, pp 239–273Google Scholar
- Luis-Calabuig E, Torres O, Valbuena L, Calvo L, Marcos E (2002) Impact of large fires on a community of Pinus pinaster. In: Trabaud L, Prodon R (eds) Fire and biological processes. Backhuys Publishers, Leiden, pp 1–12Google Scholar
- Marcos E, Valbuena L, Luis-Calabuig E, Tárrega R (1994) First stages of post-fire regeneration in Pinus radiata plantations. In: Viegas D (ed) 2nd International conference on forest fire. University of Coimbra, Coimbra, pp 969–978Google Scholar
- Mollashahi M, Hosseini SM (2007) The effects of storage during 17 years on germination of Pinus radiata from three different sites. For Sci 3:21–30Google Scholar
- Raunkiær CC (1934) The life forms of plants and statistical plant geography. Oxford University PressGoogle Scholar
- Reyes O, Casal M (2002a) Experimental field emergence and early survival of six tree species in relation to forest fires. In: Trabaud L, Prodon R (eds) Fire and biological processes. Backhuys Publishers, Leiden, pp 277–290Google Scholar
- Ryan KC, Noste NV (1985) Evaluating prescribed fires. En: Lotan JE, Kilgore BM, Fischer WC, Mutch RW (Eds.), Proceedings, Symposium and Workshop on Wilderness Fire, 15–18 November 1983, Missoula, MT. USDA Forest Service, Intermountain Forest and Range Experiment Station, General Technical Report INT-182, Missoula, MT, pp. 230–238.Google Scholar
- Trabaud L (1987) Fire and survival traits of plants. In: Trabaud L (ed) The role of fire in ecological systems. SPB Academic Publishing, The HagueGoogle Scholar
- Underwood AJ (1997) Ecological experiments: their logical design and interpretation using analysis of variance. Cambridge University Press, Cambridge, 504ppGoogle Scholar