Evolució de les zones ecològiques de Collserola (terme municipal de Barcelona, 1977-1993).

Burriel JA, Dalmases C, Pons X (2000) Evolució de les zones ecològiques de Collserola (terme municipal de Barcelona, 1977-1993). In Llimona F et al (eds) I Jornades sobre la recerca en els sistemes naturals de Collserola: aplicacions a la gestió del Parc. Parc de Collserola, Barcelona, pp. 173-176.

El mapa ecològic de Barcelona.

Burriel JA, Pons X, Terradas J (2000) El mapa ecològic de Barcelona. Ajuntament de Barcelona, 11 pp.

Aplicació del Mapa de Cobertes del Sòl de Catalunya a la gestió d'espais naturals.

Burriel JA, Pons X, Pino J, Rodà F (2000) Aplicació del Mapa de Cobertes del Sòl de Catalunya a la gestió d'espais naturals. In Llimona F et al (eds) I Jornades sobre la recerca en els sistemes naturals de Collserola: aplicacions a la gestió del Parc. Parc de Collserola, Barcelona, pp. 275-278.

Aula d'Ecologia. Cicles de conferències 1997 i 1998.

Estiarte M, Castells E (eds) (2000) Aula d'Ecologia. Cicles de conferències 1997 i 1998. Servei de Publicacions, Universitat Autònoma de Barcelona, Bellaterra, 195 pp.

Interpopulation esterase variation in the genus Petrocoptis A. Braun (Caryophyllaceae).

Mayol M, Rosselló JA (2000) Interpopulation esterase variation in the genus Petrocoptis A. Braun (Caryophyllaceae). Israel Journal of Plant Sciences 48:79-89.

Les introductions comme mode de gestion d'espèces végétales menacées: le cas de la centaurée de la clape.

Colas B, Riba M, Fréville H, Mignot A, Imbert E, Petit C, Olivieri I (2000) Les introductions comme mode de gestion d'espèces végétales menacées: le cas de la centaurée de la clape. Revue Ecologie (Terre Vie), Suppl. 7, pp 133-134.

A methodological approach of climatological modelling of air temperature and precipitation through GIS techniques

Ninyerola M., Pons X., Roure J.M. (2000) A methodological approach of climatological modelling of air temperature and precipitation through GIS techniques. International Journal of Climatology. 20: 1823-1841.
Enllaç
Doi: 10.1002/1097-0088(20001130)20:14<1823::AID-JOC566>3.0.CO;2-B

Resum:

This study proposes an empirical methodology for modelling and mapping the air temperature (mean maximum, mean and mean minimum) and total precipitation, all of which are monthly and annual, using geographical information systems (GIS) techniques. The method can be seen as an alternative to classical interpolation techniques when spatial information is available. The geographical area used to develop and apply this model is Catalonia (32000 km2, northeast Spain). We have developed a multiple regression analysis between these meteorological variables as the dependent ones, and some geographical variables (altitude (ALT), latitude (LAT), continentality (CON), solar radiation (RAD) and a cloudiness factor (CLO)) as the independent ones. Data for the dependent variables were obtained from meteorological stations, and data for the independent variables were elaborated from a 180 m resolution digital elevation model (DEM). Multiple regression coefficients (bn) were used to build final maps, using digital layers for each independent variable, and applying basic GIS techniques. The results are very satisfactory in the case of mean air temperature and mean minimum air temperature, with coefficients of determination (R2) between 0.79 and 0.97, depending on the month; in the case of mean maximum air temperature, R2 ranges between 0.70 and 0.89, while in the case of precipitation, it ranges between 0.60 and 0.91. Copyright © 2000 Royal Meteorological Society.

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A methodological approach of climatological modelling of air temperature and precipitation through GIS techniques

Ninyerola, M., Pons, X., Roure, J.M. (2000) A methodological approach of climatological modelling of air temperature and precipitation through GIS techniques. International Journal of Climatology. 20: 1823-1841.
Enllaç
Doi: 10.1002/1097-0088(20001130)20:14&lt;1823::AID-JOC566&gt;3.0.CO;2-B

Resum:

Comparative photochemical and phenomorphological responses to winter stress of an evergreen (Quercus ilex L.) and a semi-deciduous (Cistus albidus L.) Mediterranean woody species

Oliveira G., Peñuelas J. (2000) Comparative photochemical and phenomorphological responses to winter stress of an evergreen (Quercus ilex L.) and a semi-deciduous (Cistus albidus L.) Mediterranean woody species. Acta Oecologica. 21: 97-107.
Enllaç
Doi: 10.1016/S1146-609X(00)00121-1

Resum:

The impact of winter stress on plants from a Mediterranean area was evaluated through comparison of photosystem II (PS II) efficiencies and phenomorphological characteristics of two Mediterranean woody species - Quereus ilex (evergreen) and Cistus albidus (semi-deciduous). The studies were carried out in NE Spain, at two sites with different mean winter temperatures. The results showed that reductions of the efficiency of PS II may occur in Mediterranean plant communities during winter, and are especially remarkable on colder days. The extent and duration of the decrease in PS II efficiency (photoinhibition) depended not only on the climatic conditions, but also on the site, on the species considered and on the position of leaves in the plant canopy. Increased photoinhibition at the colder site was only clear for C. albidus. Nevertheless, the efficiencies of PS II were always higher in C. albidus than in Q. ilex. Phenological patterns, morphology and leaf inclination may protect C. albidus leaves from potentially photoinhibitory conditions in winter. Morphological and structural photoprotection is apparently not so well developed in Q. ilex, which probably relies more on increased protection at the photochemical level of its long-lived leaves. As has been reported in relation to summer-drought stress, Q. ilex has possibly developed a strategy of tolerance to photoinhibition, whereas C. albidus relies preferentially on avoidance features. (C) 2000 Editions scientifiques et medicales Elsevier SAS.

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Mitigation strategies in some motorway embankments (Catalonia, Spain).

Andrés P, Jorba M (2000) Mitigation strategies in some motorway embankments (Catalonia, Spain). Restoration Ecology 8:268-275.

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