Nutrient distribution and cycling.

Escarré A, Rodà F, Terradas J, Mayor X (1999) Nutrient distribution and cycling. In Rodà F, Retana J, Gracia C, Bellot J (eds) Ecology of Mediterranean evergreen oak forests. Springer, Berlin, pp. 253-269.

Gas exchange and water relations.

Savé R, Castell C, Terradas J (1999) Gas exchange and water relations. In Rodà F, Retana J, Gracia C, Bellot J (eds) Ecology of Mediterranean evergreen oak forests. Springer, Berlin, pp. 135-147.

L'ecosistema urbà.

Terradas J (1999) L'ecosistema urbà. In García A, Rueda R (eds) La ciutat sostenible. Centre de Cultura Contemporània de Barcelona, Barcelona, pp. 75-84.

Spain.

Fernández A, Terradas J (1999) Spain. In Parviainen J et al (eds) Research in forest reserves and natural forests in European countries. EFI Proceedings No. 16. EFI, pp. 233-244.

Holm oak and holm oak forests: an introduction.

Terradas J (1999) Holm oak and holm oak forests: an introduction. In Rodà F, Retana J, Gracia C, Bellot J (eds) Ecology of Mediterranean evergreen oak forests. Springer, Berlin, pp. 3-14.

Reflexiones para una transición: del estado del bienestar al futuro.

Terradas J (1999) Reflexiones para una transición: del estado del bienestar al futuro. En Homenaje a Don Ángel Ramos Fernández (1926-1998). Real Academia de Ciencias Exactas Físicas y Naturales Academia de Ingeniería

Barcelona 1985-1999. Ecologia d'una ciutat.

Barracó H, Parés M, Prat A, Terradas J (1999) Barcelona 1985-1999. Ecologia d'una ciutat. Ajuntament de Barcelona, Barcelona.

Las causas ambientales de la biodiversidad en los Monegros.

Terradas J (1999) Las causas ambientales de la biodiversidad en los Monegros. In Meliá A, Blasco-Zuneta J (eds) Manifiesto científico por los Monegros. Boletín de la Sociedad Entomológica Aragonesa 24:87-88.

Variability of plant nitrogen and water use in a 100-m transect of a subdesertic depression of the Ebro valley (Spain) characterized by leaf δ13C and δ15N

Peñuelas J., Filella I., Terradas J. (1999) Variability of plant nitrogen and water use in a 100-m transect of a subdesertic depression of the Ebro valley (Spain) characterized by leaf δ13C and δ15N. Acta Oecologica. 20: 119-123.
Enllaç
Doi: 10.1016/S1146-609X(99)80024-1

Resum:

We studied carbon and nitrogen isotopic composition (δ13C and δ15N) in sunlit leaves of four dominant species (Rosmarinus officinalis L., Stipa parviflora L., Juniperus thurifera L. and Pinus halepensis L.) in a characteristic gradient of water and nitrogen availability produced by relief and micrometeorology in a subdesertic valley of central-NE Spain. Minimum values of δ13C were found at the foothills, and higher values were found both in the valley and oil the top of the hill where water availability was lower. However, different species (functional groups) presented different δ13C values in the same valley. The lowest values of δ15N were found on the top of the hill and the highest ones in the valley, where N losses would thus be higher. In general, when growing together, trees showed 2 ‰ higher values for δ13C as well as for δ15N than shrubs and grasses. The specific responses show that they use different available water and nitrogen resources within small catchments. For this ecosystem type, C and N isotope analyses are sensitive enough to resolve fine spatial and functional patterns even over a very short distance (100 m), where topography generates great gradients in microclimate, hydrology, soil physical conditions, vegetation and biogeochemistry.

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