Association between forest type and forest history near Barcelona (Catalonia) - a GIS approach.

Basnou C, Guirado M, Pino J, Rodà F (2003) Association between forest type and forest history near Barcelona (Catalonia) - a GIS approach. Contributii Botanice 38:135-140.

Influence of fire severity on plant regeneration by means of remote sensing imagery

Díaz-Delgado R., Lloret F., Pons X. (2003) Influence of fire severity on plant regeneration by means of remote sensing imagery. International Journal of Remote Sensing. 24: 1751-1763.
Enllaç
Doi: 10.1080/01431160210144732

Resum:

In this paper we analyse the interactions between fire severity (plant damage) and plant regeneration after fire by means of remote sensing imagery and a field fire severity map. A severity map was constructed over a large fire (2692 ha) occurring in July 1994 in the Barcelona province (north-east of Spain). Seven severity classes were assigned to the apparent plant damage as a function of burning intensity. Several Landsat TM and MSS images from dates immediately before and after the fire were employed to monitor plant regeneration processes as well as to evaluate the relationship with fire severity observed in situ. Plant regeneration was monitored using NDVI measurements (average class values standardized with neighbour unburned control plots). Pre-fire NDVI measurements were extracted for every plant cover category (7), field fire severity class (7), and spatial cross-tabulation of both layers (33) and compared to post-fire values. NDVI decline due to fire was positively correlated with field fire severity class. Results show different patterns of recovery for each dominant species, severity class and combination of both factors. For all cases a significant negative correlation was found between damage and regeneration ability. This work leads to a better understanding of the influence of severity, a major fire regime parameter on plant regeneration, and may aid to manage restoration on areas burned under different fire severity levels.

Llegeix més

Tot perdent i guanyant carboni: La resposta dels boscos al canvi global.

Pla E, Gracia C, Espelta JM (2003) Tot perdent i guanyant carboni: La resposta dels boscos al canvi global. Viu la Ciència 2003. Societat Catalana de Biologia. Institut d'Estudis Catalans.

Modelización de la dinámica de combustible en ecosistemas arbustivos mediterráneos.

Pla E, Rodà F, Gracia C (2003) Modelización de la dinámica de combustible en ecosistemas arbustivos mediterráneos. In VII Congreso Nacional de la Asociación Española de Ecología Terrestre. AEET-CREAF. Soft Congres, Barcelona, pp. 1243-1261.

La matriz del paisaje.

Rodà F (2003) La matriz del paisaje. In Folch R (ed) El territorio como sistema. Concepto y herramientas de ordenación. CUIMP, Centre Ernest Lluch, Territorio y Gobierno Visiones 3, Diputació de Barcelona, Barcelona, pp. 43-55.

Jornades sobre biodiversitat i conservació biològica.

Vilà M, Rodà F, Ros J (eds) (2003) Jornades sobre biodiversitat i conservació biològica. Institut d'Estudis Catalans, Sèrie jornades científiques 10, Barcelona, 412 pp. ISBN 84-7283-685-1.

Partitioning of water and nitrogen in co-occurring Mediterranean woody shrub species of different evolutionary history

Filella I., Peñuelas J. (2003) Partitioning of water and nitrogen in co-occurring Mediterranean woody shrub species of different evolutionary history. Oecologia. 137: 51-61.
Enllaç
Doi: 10.1007/s00442-003-1333-1

Resum:

We studied the interspecific and intraspecific variation in the development of water stress and in the use of different water and nitrogen sources during the spring (wet season) and summer (dry season) in a shrub community in NE Spain. We measured shoot water potentials, stable deuterium isotopic composition (δD) of xylem sap, leaf mass per area, leaf N and C concentrations, gas exchange, leaf δ13C, and leaf δ 15N of the dominant species (Quercus coccifera, Arbutus unedo, Pistacia lentiscus, Erica multiflora, Globularia alypum). The δD, the δ13C and the shoot water potential values showed diurnal, seasonal, intraspecific and interspecific variation in the source and use of water. There was also seasonal, intraspecific and interspecific variation in the foliar δ15N and N concentrations. In summer, some species (A. unedo, P. lentiscus and E. multiflora) presented significantly different δD values in morning and afternoon measurements likely indicating that they used different sources of water during the day, and a dual root system in these species. We conjecture that dew may be one of these water sources. Species predawn water potential was negatively correlated with species xylem water δD. There was also a positive correlation between δ 13C and δD in P. lentiscus, species for which we took additional samples from nearby sites. These results suggest that the access to water from greater depths allowed the maintenance of more favourable plant water supply. Multivariate principal component analysis based on the studied hydrological and isotope variables clearly separated the seasons (wet spring and dry summer) and the species. The species resulted separated according to their evolutionary history (Pre-Mediterranean and Mediterranean) and the associated root and functional traits. These results show water (and nitrogen) partitioning among coexisting species of the same functional type (Mediterranean woody shrubs). They also show the great intraspecific plasticity of responses to resource availability.

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Els boscos madurs dels Pirineus.

Lloret F (2003) Els boscos madurs dels Pirineus. In Boscos vells, Artists for Nature als Pirineus Catalans. Fundació Territori i Paisatge, pp. 32-36

Responses of Mediterranean plant species to different fire frequencies in Garraf Natural Park (Catalonia, Spain): field observations and modelling predictions.

Lloret F, Pausas JG, Vilà M (2003) Responses of Mediterranean plant species to different fire frequencies in Garraf Natural Park (Catalonia, Spain): field observations and modelling predictions. Plant Ecology 167:223-235.

Diversity patterns of plant functional types in relation to fire regime and previous land use in Mediterranean woodlands.

Lloret F, Vilà M (2003) Diversity patterns of plant functional types in relation to fire regime and previous land use in Mediterranean woodlands. Journal of Vegetation Science 14:387-398.

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