Avaluació de treballs de rehabilitació de sòl en àrees afectades per activitats extractives a Catalunya: criteris de qualitat de la restauració.

Alcañiz JM, Ortiz O (2003) Avaluació de treballs de rehabilitació de sòl en àrees afectades per activitats extractives a Catalunya: criteris de qualitat de la restauració. Orsis 18:63-75.

Resprouting patterns after fire and response to stool cleaning of two coexisting Mediterranean oaks with contrasting leaf habits on two different sites.

Espelta JM, Retana J, Habrouk A (2003) Resprouting patterns after fire and response to stool cleaning of two coexisting Mediterranean oaks with contrasting leaf habits on two different sites. Forest Ecology and Management 179:401-414.

An economic and ecological multi-criteria evaluation of reforestation methods to recover burned Pinus nigra forests in NE Spain.

Espelta JM, Retana J, Habrouk A (2003) An economic and ecological multi-criteria evaluation of reforestation methods to recover burned Pinus nigra forests in NE Spain. Forest Ecology and Management 180:185-198.

Emisiones biogénicas de COVs y cambio global ¿Se defienden las plantas contra el cambio climático?

Peñuelas J, Lluisà J (2003) Emisiones biogénicas de COVs y cambio global ¿Se defienden las plantas contra el cambio climático? Ecosistemas 1.

Effect of drought on diameter increment of Quercus ilex, Phillyrea latifolia, and Arbutus unedo in a holm oak forest of NE Spain.

Ogaya, R, Peñuelas J, Martínez-Vilalta J, Mangirón M (2003) Effect of drought on diameter increment of Quercus ilex, Phillyrea latifolia, and Arbutus unedo in a holm oak forest of NE Spain. Forest Ecology and Management 180:175-184.

Photo- and antioxidative protection, and a role for salicylic acid drought and recovery in field-grown Phillyrea angustifolia plants.

Munné-Bosch S, Peñuelas J (2003) Photo- and antioxidative protection, and a role for salicylic acid drought and recovery in field-grown Phillyrea angustifolia plants. Planta 217:758-766.

Nitrogen and carbon concentrations, and stable isotope ratios in Mediterranean shrubs growing in the proximity of a CO2 spring.

Tognetti R, Peñuelas J (2003) Nitrogen and carbon concentrations, and stable isotope ratios in Mediterranean shrubs growing in the proximity of a CO2 spring. Biologia Plantarum 46:411-418.

Passeig ecofisiològic per l'espai i pel temps: l'estudi de les alteracions produïdes pels canvis climàtics i atmosfèrics en l'estructura i el funcionament de les plantes i dels ecosistemes terrestres.

Peñuelas J, Filella I, Estiarte M, Llusià J, Ogaya R, Ribas A, Llorens L, Mangiron M, Munné-Bosch S, Bruna P, Prieto P, Asensio D, Sardans J, Serrano L, Oliveira G, Castells E, Rodà F, Lloret F, Terradas J (2003) Passeig ecofisiològic per l'espai i pel temps: l'estudi de les alteracions produïdes pels canvis climàtics i atmosfèrics en l'estructura i el funcionament de les plantes i dels ecosistemes terrestres. Treballs de la Societat Catalana de Biologia 54:65-84.

Association between Opuntia species invasion and changes in land-cover in the Mediterranean region.

Vilà M, Burriel JA, Pino J, Chamizo J, Llach E, Porterias M, Vives M (2003) Association between Opuntia species invasion and changes in land-cover in the Mediterranean region. Global Change Biology 9:1234-1239.

Ecophysiological responses of two Mediterranean shrubs, Erica multiflora and Globularia alypum, to experimentally drier and warmer conditions

Llorens L., Peñuelas J., Estiarte M. (2003) Ecophysiological responses of two Mediterranean shrubs, Erica multiflora and Globularia alypum, to experimentally drier and warmer conditions. Physiologia Plantarum. 119: 231-243.
Enllaç
Doi: 10.1034/j.1399-3054.2003.00174.x

Resum:

A new approach was used to experimentally dry and warm a Mediterranean shrubland. By means of automatically sliding curtains, the drought period was extended by excluding rain over the two growing seasons (spring and autumn), and passive warming was created by avoiding infra-red dissipation at night over the whole year. The aim of the study was to test how a future extended drought period and an increase in temperatures could affect the photosynthetic and water use strategies of two co-occurring Mediterranean shrubs, Erica multiflora and Globularia alypum, which are common species of the dry coastal shrublands. The shoot water potential, leaf gas exchange rates and chlorophyll a fluorescence of plants was monitored seasonally during two years (1999-2001). In addition we measured the photosynthetic response curves to light and CO 2 in autumn 2001 and the foliar N concentration and leaf C and N stable isotopes in summer 1999 and 2000. Droughted plants of both shrub species showed lower shoot water potentials, transpiration rates and stomatal conductances than control plants, although there was a high seasonal variability. Drought treatment reduced significantly the overall leaf net photosynthetic rates of E. multiflora, but not of G. alypum. Droughted plants of E. multiflora also showed lower leaf net photosynthetic rates in response to light and CO2 and lower carboxylation efficiency than controls, but there was no significant effect of drought on its overall photosystem II (PSII) photochemical efficiency. Although warming treatment did not affect the leaf net photosynthetic rates of the two species overall the study, it increased significantly the carboxylation efficiency and leaf net photosynthetic rates of G. alypum plants in response to CO2 levels in autumn 2001. In addition, warming treatment increased the potential photochemical efficiency of PSII (Fv/Fm) of both species (but especially of G. alypum) at predawn or midday and mainly in autumn and winter. Thus, the results suggest that drier conditions might decrease the annual productivity of these Mediterranean shrubs, particularly of E. multiflora, and that future warming could alleviate the present low temperature constraints of the photosynthetic performance of the two studied species, but especially of G. alypum, during the colder seasons. Ultimately, drier and warmer conditions in the near future may change the competitive relationship among these species in such Mediterranean ecosystems.

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