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, Graça; Peñuelas, Josep

doi:10.1016/s1146-609x(00)00121-1

Cited by 74 publications

(50 citation statements)

References 36 publications

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“…In the Mediterranean area, warming effects are expected to be dependent on the season. Increased temperatures in the warmest seasons in this area may P. Prieto Á J. Peñuelas (&) Á J. Llusià Á D. Asensio Á M. Estiarte Ecophysiology and Global Change Unit CREAF-CEAB-CSIC, Centre for Ecological Research and Forestry Applications, Edifici C, Universitat Autònoma de Barcelona, 08193 Bellaterra (Barcelona), Spain e-mail: josep.penuelas@uab.cat decrease photosynthetic rates due to overheating Peñuelas and Llusià 2002;Llorens et al 2004), whereas warming may alleviate minimum temperatures in colder seasons to which some Mediterranean species are sensitive (Mitrakos 1980;Oliveira and Peñuelas 2000Peñuelas 2003a, b, 2007). Moreover, warming effects on plant growth may be related to indirect effects.…”

Section: Introductionmentioning

confidence: 99%

Effects of experimental warming and drought on biomass accumulation in a Mediterranean shrubland

et al. 2009

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We studied the effects of experimental warming and drought on the plant biomass of a Mediterranean shrubland. We monitored growth at plant level and biomass accumulation at stand level. The experimentation period stretched over 7 years (1999)(2000)(2001)(2002)(2003)(2004)(2005) and we focused on the two dominant shrub species, Erica multiflora L. and Globularia alypum L. and the tree species Pinus halepensis L. The warming treatment increased shoot elongation in E. multiflora, and the drought treatment reduced shoot elongation in G. alypum. The elongation of P. halepensis remained unaffected under both treatments. The balance between the patterns observed in biomass accumulation for the three studied species in the drought plots (reduction in E. multiflora and P. halepensis and increase in G. alypum) resulted in a trend to reduce 33% the biomass of the drought treatment plots with respect to the untreated plots, which almost doubled their biomass from 1998 to 2005. The results also suggest that under drier conditions larger accumulation of dead biomass may occur at stand level, which combined with higher temperatures, may thus increase fire risk in the Mediterranean area.

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Section: Introductionmentioning

confidence: 99%

Effects of experimental warming and drought on biomass accumulation in a Mediterranean shrubland

et al. 2009

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“…This fact could be interpreted in the sense that the photosystems recover their normal activity level at the end of the evening, even in summer time, when stress conditions are extreme, with plants undergoing heavy sun radiation, high temperatures and severe drought (Mulkey & Pearcy, 1992;Lovelock et al, 1994). Consequently, this suggests that the damage does not reach chronic levels (Oliveira & Peñuelas, 2000). There is an inversely proportional relationship between the decrease of F v /F m and the increase of PAR, a fact which indicates the impact of the luminous intensity on fluorescence emission (Demming-Adams & Adams, 1992).…”

Section: Discussionmentioning

confidence: 99%

Can gypsophytes distinguish different types of gypsum habitats?

Calvente¹,

Carrasco

Gómez

et al. 2009

Acta Botanica Gallica

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Abstract.-From an ecological point of view, gypsum outcrops and their corresponding vegetation are not yet fully understood. Most of the studies have concentrated on merely describing these plant communities. However, some researchers have tried to differentiate between these scrublands not only in terms of their geographical location, but also in terms of their ecological behaviour. Our botanical, edaphic and ecophysiological study, which adopts this last approach, makes use of chlorophyll fluorescence to distinguish the small-sized and sparse scrublands growing on gypsum barrens from the very different shrublike Ononis tridentata communities in the gypsum outcrop of the karst in Sorbas (Almería, Spain). In the three gypsophytes used to measure chlorophyll fluorescence values (Gypsophila struthium, Helianthemum squamatum and Teucrium turredanum), the records reveal that the environment has an impact on the F v/ F m minimum values, however different the reaction of the species may be.Key words : chlorophyll fluorescence -F v -F m -F 0 -PAR -photoinhibitiongypsophily -stress -restoration.Résumé.-Les gypses et leur végétation ne sont pas bien compris du point de vue écologique. La plupart des études realisées se sont concentrées sur la description des communautés végétales. Toutefois, quelques auteurs ont essayé de différencier ces broussailles, non seulement par leur distribution géographique mais aussi par leur comportement écologique. Ici, nous essayons d'approfondir cet aspect par une étude botanique, édaphique et écophysiologique. Nous utilisons la fluorescence de la chlorophylle pour différencier entre les broussailles ouvertes basses des barres de gypse et les communautés broussailleuses très différentes à Ononis tridentata des affleurements gypseux du karst de Sorbas (Almería, Espagne). Dans les trois gypsophytes pour lesquelles on a mesuré cette fluorescence (Gypsophila struthium, Helianthemum squamatum and Teucrium turredanum), l'environnement agit sur les valeurs minimales de F v /F m , mais toutes les espèces ne répondent pas de la même façon.

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“…In fact, photosynthesis rates in winter were measured in holm oaks in HR (Carevic, 2010), in line with other studies in Italy (Gratani et al, 2013;Catoni and Gratani 2014). Moreover, the positive response to temperatures in winter may indicate sensitivity to low temperatures leading to photoinibition (Oliveira and Peñuelas, 2000) and damage of the xylem (Lo Gullo and Salleo, 1993). On the other hand, the negative response to maximum temperatures in autumn/winter may indicate respiration-induced loss of carbohydrates.…”

Section: Trees Show Sensitivity To Increasing Droughtmentioning

confidence: 99%

The role of climate change in the widespread mortality of holm oak in open woodlands of Southwestern Spain

et al. 2016

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2 Highlights We obtained robust dendroclimatic signal in Quercus ilex from low latitudes in Iberia. We report massive die-off of Quercus ilex trees in SW Iberia. Tree growth was strongly controlled by climatic shifts in recent decades. Warmer climate with longer droughts had a key-role determining the mortality process. 3 AbstractForest decline and increasing tree mortality are of global concern and the identification of the causes is necessary to develop preventive measures. Global warming is an emerging factor responsible for the increasing tree mortality in drought-prone ecosystems. In the southwestern Iberian Peninsula, Mediterranean holm oak open woodlands currently undergo large-scale population-level tree die-off. In this region, temperature and aridity have increased during recent decades, but the possible role of climate change in the current oak mortality has not been investigated.To assess the role of climate change in oak die-off in managed open woodlands in southwestern Spain, we analyzed climate change-related signals in century-long tree ring chronologies of dead holm oaks. We examined the high/lowfrequency variability in growth and the relationship between growth and climate.Similar to other Mediterranean forests, growth was favored by precipitation from autumn of the year prior to ring formation to spring of the year of ring formation, whereas high temperatures during spring limited growth. Since the 1970s, the intensity of the high-frequency response to water availability increased simultaneously with temperature and aridity. The growth trends matched those of climatic changes. Growth suppressions occurred during droughts in the 1970s, 1980s and 1990s. Widespread stand-level, age-independent mortality occurred since 2005 and affected trees that can not be considered old for the species standards.The close relationship between growth and climate indicate that climate change strongly controlled the growth patterns.This suggests that harsher climatic conditions, especially increased aridity, affected the tree performance and could have played a significant role in the mortality process. Climate change may have exacerbated or predisposed trees to the impact of other factors (e.g. intense management and pathogens). These observations could suggest a similar future increase in oak mortality which may occur in more northern oak open woodlands if aridity further increases.

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

Cited by 74 publications

References 36 publications

Effects of experimental warming and drought on biomass accumulation in a Mediterranean shrubland

Effects of experimental warming and drought on biomass accumulation in a Mediterranean shrubland

Can gypsophytes distinguish different types of gypsum habitats?

The role of climate change in the widespread mortality of holm oak in open woodlands of Southwestern Spain

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