Contrasting impacts of continuous moderate drought and episodic severe droughts on the aboveground‐biomass increment and litterfall of three coexisting <scp>M</scp>editerranean woody species

Liu, Daijun; Ogaya, Romà; Barbeta, Adrià; Yang, Xiaohong; Peñuelas, Josep

doi:10.1111/gcb.13029

Cited by 73 publications

(102 citation statements)

References 70 publications

(165 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This reduction was not accompanied by a reduction in sapwood area, and thus the ratio of leaf to sapwood area was decreased at the shoot level (Limousin, Longepierre, et al 2010;Limousin et al 2012), indicating that tree-level transpiration was reduced by decreasing the transpiring (leaf) area, which is also in agreement with the long-term increase in leaf litterfall in the drought treatment observed in Prades (Liu et al 2015). Indeed, leaf-specific conductivity has increased in the long term in droughted plants as a consequence of a decrease in the ratio of leaf to sapwood area (MartinStpaul et al 2013).…”

Section: Trends Of Crown Defoliation and Their Relationship With Drousupporting

confidence: 77%

“…30% of the throughfall reduced soil moisture by an average of 13% in the drought-treatment plots in Prades (Liu et al 2015). An analogous reduction of ca.…”

Section: Trends Of Crown Defoliation and Their Relationship With Droumentioning

confidence: 96%

“…However, extreme droughts can impact roots by causing hydraulic dysfunction (Anderegg et al 2012;Meinzer and McCulloh 2013) and deplete below-ground reserves of NSC (Galiano et al 2012) and weaken the resprouting capacity of trees. Still, Q. ilex has shown full canopy recovery within a year after an extreme drought ) that induced extensive branch desiccation (Liu et al 2015). The presence of long-lived apical buds confers Q. ilex the capacity to resprout from stems and twigs (Table 1, Alla et al 2012).…”

Section: Trends Of Crown Defoliation and Their Relationship With Droumentioning

confidence: 99%

See 2 more Smart Citations

Sequence of plant responses to droughts of different timescales: lessons from holm oak (Quercus ilex) forests

Barbeta

Peñuelas

2016

Plant Ecology & Diversity

Self Cite

View full text Add to dashboard Cite

The functional traits of plants in regions of the world with a Mediterranean climate have been shaped to tolerate periods of water deficit. These species are adapted to summer droughts but may not be able to cope with future increases in drought intensity, duration, and/or frequency. Here, we review the mechanisms and traits of drought resistance and recovery of the well-studied holm oak (Quercus ilex), which we propose as a model species for Mediterranean-type ecosystems. Our aim was to understand the differences and links between the responses of Q. ilex to summer droughts, extreme droughts, and long-term drought experiments. A main goal was to provide an integral picture of drought responses across organisational and temporal scales for identifying the most relevant processes that are likely to contribute to determining the future of Mediterranean vegetation. Evidence from long-term drought experiments showed that acclimation processes from the molecular (e.g. epigenetic changes) to the ecosystem level (e.g. reductions in stand density) mitigate the effects of drought. Changes in leaf morphology and hydraulics, leaf-to-shoot allometry, and root functioning are among the key mechanisms for overcoming increasing drought. The duration of drought determines its severity in terms of canopy loss and stem mortality. Although Q. ilex can vigorously resprout after such episodes, its resilience may be subsequently reduced. In the future, higher frequency of return of extreme droughts will challenge thus the capacity of these forests to recover. The insights provided by this review of the complex interplay of processes that determine the response of trees to droughts of different duration, intensity, and frequency will also help us to understand the likely responses of other resprouting angiosperms in seasonally dry ecosystems that share similar functional traits with Q. ilex.

show abstract

Section: Trends Of Crown Defoliation and Their Relationship With Drousupporting

confidence: 77%

“…30% of the throughfall reduced soil moisture by an average of 13% in the drought-treatment plots in Prades (Liu et al 2015). An analogous reduction of ca.…”

Section: Trends Of Crown Defoliation and Their Relationship With Droumentioning

confidence: 96%

Section: Trends Of Crown Defoliation and Their Relationship With Droumentioning

confidence: 99%

See 1 more Smart Citation

Sequence of plant responses to droughts of different timescales: lessons from holm oak (Quercus ilex) forests

Barbeta

Peñuelas

2016

Plant Ecology & Diversity

Self Cite

View full text Add to dashboard Cite

show abstract

“…As a result, there is evidence of differential sensitivity among plant genotypes [37,38], species [9,[39][40][41] and functional groups [4,42,43] to climate extremes. Liu et al [44] observed large variation in long-term drought impacts to tree growth depending on the species considered in Mediterranean forest communities, with fruit production and growth largely impacted in certain species and others not affected. Similarly, Hoover et al [4] observed differential sensitivity to repeated droughts and heatwaves between the C 3 and C 4 co-dominant plant species.…”

Section: Scaling Individual Plant Responses To the Population And Commentioning

confidence: 99%

Integrating plant ecological responses to climate extremes from individual to ecosystem levels

Felton

Smith

2017

Phil. Trans. R. Soc. B

101

View full text Add to dashboard Cite

Climate extremes will elicit responses from the individual to the ecosystem level. However, only recently have ecologists begun to synthetically assess responses to climate extremes across multiple levels of ecological organization. We review the literature to examine how plant responses vary and interact across levels of organization, focusing on how individual, population and community responses may inform ecosystem-level responses in herbaceous and forest plant communities. We report a high degree of variability at the individual level, and a consequential inconsistency in the translation of individual or population responses to directional changes in community- or ecosystem-level processes. The scaling of individual or population responses to community or ecosystem responses is often predicated upon the functional identity of the species in the community, in particular, the dominant species. Furthermore, the reported stability in plant community composition and functioning with respect to extremes is often driven by processes that operate at the community level, such as species niche partitioning and compensatory responses during or after the event. Future research efforts would benefit from assessing ecological responses across multiple levels of organization, as this will provide both a holistic and mechanistic understanding of ecosystem responses to increasing climatic variability. This article is part of the themed issue ‘Behavioural, ecological and evolutionary responses to extreme climatic events’.

show abstract

“…It has been reported that drought and warming can advance the spring growing season, affect reproductive performance and decrease plant productivity of E. multiflora [63,64]. The drier and warmer conditions projected for the future could affect diversity, decrease biomass and increase mortality in Mediterranean ecosystems [11,18,21,65]. Additionally, warmer conditions generally imply that plants need more water due to higher transpiration.…”

Section: Pri Assessment Of Seasonal Photosynthesis Under Long-term Drmentioning

confidence: 99%

Photochemical Reflectance Index (PRI) for Detecting Responses of Diurnal and Seasonal Photosynthetic Activity to Experimental Drought and Warming in a Mediterranean Shrubland

et al. 2017

Self Cite

View full text Add to dashboard Cite

Climatic warming and drying are having profound impacts on terrestrial carbon cycling by altering plant physiological traits and photosynthetic processes, particularly for species in the semi-arid Mediterranean ecosystems. More effective methods of remote sensing are needed to accurately assess the physiological responses and seasonal photosynthetic activities of evergreen species to climate change. We evaluated the stand reflectance in parallel to the diurnal and seasonal changes in gas exchange, fluorescence and water contents of leaves and soil for a Mediterranean evergreen shrub, Erica multiflora, submitted to long-term experimental warming and drought. We also calculated a differential photochemical reflectance index (∆PRI, morning PRI subtracted from midday PRI) to assess the diurnal responses of photosynthesis (∆A) to warming and drought. The results indicated that the PRI, but not the normalized difference vegetation index (NDVI), was able to assess the seasonal changes of photosynthesis. Changes in water index (WI) were consistent with seasonal foliar water content (WC). In the warming treatment, ∆A value was higher than control in winter but ∆Yield was significantly lower in both summer and autumn, demonstrating the positive effect of the warming on the photosynthesis in winter and the negative effect in summer and autumn, i.e., increased photosynthetic midday depression in summer and autumn, when temperatures were much higher than in winter. Drought treatment increased the midday depression of photosynthesis in summer. Importantly, ∆PRI was significantly correlated with ∆A both under warming and drought, indicating the applicability of ∆PRI for tracking the midday depression of photosynthetic processes. Using PRI and ∆PRI to monitor the variability in photosynthesis could provide a simple method to remotely sense photosynthetic seasonality and midday depression in response to ongoing and future environmental stresses.

show abstract

Contrasting impacts of continuous moderate drought and episodic severe droughts on the aboveground‐biomass increment and litterfall of three coexisting Mediterranean woody species

Cited by 73 publications

References 70 publications

Sequence of plant responses to droughts of different timescales: lessons from holm oak (Quercus ilex) forests

Sequence of plant responses to droughts of different timescales: lessons from holm oak (Quercus ilex) forests

Integrating plant ecological responses to climate extremes from individual to ecosystem levels

Photochemical Reflectance Index (PRI) for Detecting Responses of Diurnal and Seasonal Photosynthetic Activity to Experimental Drought and Warming in a Mediterranean Shrubland

Contact Info

Product

Resources

About