Methods and techniques to study soils affected by fire
EGU2013, Vienna, Austria
Description and scopeFire is a global phenomenon with important implications in many world ecosystems. Tropical, temperate, Mediterranean and boreal areas are affected recurrently by fire, which has shaped these ecosystems, altered their characteristics and changed their distribution. Thus fire is considered as a natural element with a wide range of diverse impacts. Among these, the impact on soils is the objective and focus of the course.
Soil properties can be substantially changed in space and time after fire. These changes can produce positive or negative impacts on the system, depending on the type of soil affected and fire severity. Fire severity and the degree of change depends in turn on fire behaviour and temperatures reached in soil, the residence time, and other biophysical variables (ecosystem type, fuel characteristics, topography, weather, etc.).
These changes can lead to deep post-fire changes in the ecosystem. Vegetation canopy is dramatically reduced by burning, increasing soil erosion risk and altering soil properties as water infiltration rates, hydrophobicity, structure, chemical and biological properties. In addition, the ash deposited has important physical, hydrological and chemical effects. The importance of these impacts depends especially on the post-fire conditions (wind and rain) and topography of the burned area. The combined degree of all these variables determines the ability of the ecosystem to recover. A novel topic related to soils and fires is smouldering. Smouldering combustion, the slow, low-temperature, flameless burning of porous soil organic layers, like peatlands, represents the most persistent type of combustion phenomena and leads to the largest fires on Earth. Smouldering mega-fires involving peat occur with considerable frequency in Indonesia, Canada, Russia, USA and the UK. In terms of mass removal, burnt layers loss most of its organic content (up to 90% of its mass in peat). Moreover, the prolonged heating rates from smouldering result in high severity. Temperatures in excess of 300 °C for residence times of 1 h lead to sterilization of the soil and severe irreversible changes of physical, chemical and biological nature. Dates and locationEuropean Geosciences Union General Assembly 2013
Vienna, Austria 8th April 2013 15:30 - 17:00 Austria Center Vienna, Room R2 (red level) |
OrganizationConvener
Paulo Pereira (Mykolas Romeris University, Lithuania) Co-conveners Antonio Jordán (University of Sevilla, Spain) Guillermo Rein (Imperial College London, UK) Victoria Arcenegui (University Miguel Hernández, Spain) Xavier Úbeda (University of Barcelona, Spain) Lorena M. Zavala, (University of Sevilla, Spain) TeachersDr. María Fernández-Raga (University of León, Spain)
Dr. Antònio Ferreira (Polytechnic Institute of Coimbra, Portugal) Antonio Jordán (University of Sevilla, Spain) Jan Jacob Keizer (University of Aveiro, Portugal) Paulo Pereira (Mykolas Romeris University, Lithuania) Guillermo Rein (Imperial College London, UK) Claudio Zaccone (University of Foggia, Italy) |
Objetives
AudienceBachelor, Master, PhD students and professionals working in forest management.
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Programme 15:30-15:40. Opening ceremony (Dr. Paulo Pereira, Dr. Antonio Jordán, Dr. Guillermo Rein)
15:40-15:55. Methodologies for measuring rainsplash effects in fire-affected soils. Dr. María Fernández-Raga (University of León, Spain) 15:55-16:10. Methods for studying soil and water conservation after fires. Dr. António Ferreira (Polytechnic Institute of Coimbra, Portugal) 16:10-16:25. Measurement methods of post-fire export of sediments, nutrients and pollutants by runoff. From the plot- to catchment-scale. Dr. Jan Jacob Keizer (University of Aveiro, Portugal) 16:25-16:40. Methods to study the extent, depth and damage of smouldering fires in organic soils. Dr. Guillermo Rein (Imperial College London, UK) 16:40-16:55. Physico-chemical and spectroscopic investigations of organic matter evolution in peat affected by smouldering. Dr. Claudio Zaccone (University of Foggia, Italy) 16:55-17:00. Closing ceremony and delivery of the certificates of participation. |
SupportLITFIRE, Fire effects in Lithuanian soils and ecosystems (MIP-048/2011), funded by the Lithuanian Research Council.
HYDFIRE project, Water repellency in Mediterranean fire-affected soils. Involved factors, temporal changes and implications for hydrology and soil system functioning (CGL2010-21670-C02-01), funded by the Spanish Ministry of Economy and Competitiveness. FIRECNUTS, WildFIRE effects on topsoil Carbon and NUTrient Stocks, dynamics and exports, funded by the Portuguese Foundation for Science and Technology (FCT; PTDC/AGR-CFL/104559/2008), with co-funding by FEDER through the COMPETE Programme FUEGORED, Spanish Network Fire Effects on Soil Properties |