Diurnal dynamics of water transport, storage and hydraulic conductivity in pine trees under seasonal drought

Klein, Tamir; Cohen, Shabtai; Paudel, Indira; Preisler, Yakir; Rotenberg, Eyal; Yakir, Dan

doi:10.3832/ifor2046-009

Cited by 38 publications

(30 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is consistent with previous studies that showed a higher stress level in smaller trees than in larger ones (Dobbertin, Baltensweiler, & Rigling, ). Large biomass also provided the tree with a larger diameter roots (Table , Figure b), more extensive water conduits, improved tree water storage (Klein et al, ) and consequently improved resistance to prolonged dry conditions. The above‐ground biomass in the D plots was <60% of the biomass in L plots.…”

Section: Discussionmentioning

confidence: 99%

Mortality versus survival in drought‐affected Aleppo pine forest depends on the extent of rock cover and soil stoniness

et al. 2019

View full text Add to dashboard Cite

Drought‐related tree mortality had become a widespread phenomenon in forests around the globe. This process leading to these events and its complexity is not fully understood. Trees in the dry timberline are exposed to ongoing drought, and the available water for transpiration in the soil can determine their survival chances. Recent drought years led to 5%–10% mortality in the semi‐arid pine forest of Yatir (Israel). The distribution of dead trees was, however, highly heterogeneous with parts of the forest showing >80% dead trees (D plots) and others with mostly live trees (L plots). At the tree level, visible stress was associated with low pre‐dawn leaf water potential at the dry season (−2.8 MPa vs. −2.3 MPa in non‐stressed trees), shorter needles (5.5 vs. 7.7 mm) and lower chlorophyll content (0.6 vs. 1 mg/g dw). Trends in tree‐ring widths reflected differences in stress intensity (30% narrower rings in stressed compared with unstressed trees), which could be identified 15–20 years prior to mortality. At the plot scale, no differences in topography, soil type, tree age or stand density could explain the mortality difference between the D and L plots. It could only be explained by the higher surface rock cover and in stoniness across the soil profile in the L plots. Simple bucket model simulations using the site’s long‐term hydrological data supported the idea that these differences could result in higher soil water concentration (m3/m3) in the L plots and extend the time above wilting point by several months across the long dry season. Accounting for subsurface heterogeneity may therefore critical to assessing stand‐level response to drought and projecting tree survival, and can be used in management strategies in regions undergoing drying climate trends. A plain language summary is available for this article.

show abstract

Section: Discussionmentioning

confidence: 99%

Mortality versus survival in drought‐affected Aleppo pine forest depends on the extent of rock cover and soil stoniness

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The species is adapted to the xerothermic conditions (high temperatures and droughts) of the Mediterranean, due to its drought avoidance strategy of reducing stomatal conductance under water shortage [4]. This isohydric response allows Aleppo pine to limit the reduction of needle water potential and xylem cavitation, to which it is quite vulnerable [5,6]. Moreover, Aleppo pine has adapted its physiological activity to the seasonally changing climatic regime in the region.…”

Section: Introductionmentioning

confidence: 99%

Environmental Controls on the Seasonal Variation in Gas Exchange and Water Balance in a Near-Coastal Mediterranean Pinus halepensis Forest

Fotelli¹,

Korakaki²,

Paparrizos

et al. 2019

Forests

View full text Add to dashboard Cite

Aleppo pine (Pinus halepensis Mill.) is widespread in most countries of the Mediterranean area. In Greece, Aleppo pine forms natural stands of high economic and ecological importance. Understanding the species’ ecophysiological traits is important in our efforts to predict its responses to ongoing climate variability and change. Therefore, the aim of this study was to assess the seasonal dynamic in Aleppo pine gas exchange and water balance on the leaf and canopy levels in response to the intra-annual variability in the abiotic environment. Specifically, we assessed needle gas exchange, water potential and δ13C ratio, as well as tree sap flow and canopy conductance in adult trees of a mature near-coastal semi-arid Aleppo pine ecosystem, over two consecutive years differing in climatic conditions, the latter being less xerothermic. Maximum photosynthesis (Amax), stomatal conductance (gs), sap flow per unit leaf area (Ql), and canopy conductance (Gs) peaked in early spring, before the start of the summer season. During summer drought, the investigated parameters were negatively affected by the increasing potential evapotranspiration (PET) rate and vapor pressure deficit (VPD). Aleppo pine displayed a water-saving, drought avoidance (isohydric) strategy via stomatal control in response to drought. The species benefited from periods of high available soil water, during the autumn and winter months, when other environmental factors were not limiting. Then, on the leaf level, air temperature had a significant effect on Amax, while on the canopy level, VPD and net radiation affected Ql. Our study demonstrates the plasticity of adult Aleppo pine in this forest ecosystem in response to the concurrent environmental conditions. These findings are important in our efforts to predict and forecast responses of the species to projected climate variability and change in the region.

show abstract

“…Although still implicit and invasive to a certain degree, hydraulic conductivity measures directly the consequence of embolism, and the technique has been the basis for early descriptions of the Table 1 Study cases on xylem refilling published since 2013, divided by biome and woody plant species. Source references are: (1) Leng et al (2013); (2) Zwieniecki et al (2013); (3) Ooeda et al (2016); (4) Ogasa et al (2013); (5) Umebayashi et al (2016); (6) Martorell et al (2014); (7) Christman et al (2012); (8) Choat et al (2015); (9) Laur and Hacke (2014); (10) Mayr et al (2014); (11) Christensen-Dalsgaard et al (2014); (12) Rolland et al (2015); (13) Ganthaler and Mayr (2015); (14) Trifilo et al (2015); (15) Savi et al (2016); (16) Klein et al 2016;(17) Li et al (2016); (18) Numbers in parentheses indicate the reference number of the respective study in the reference list. The observed changes in embolism level for each species are in Fig.…”

Section: Destructive Measurementsmentioning

confidence: 99%

“…; (3)Ooeda et al (2016); (4)Ogasa et al (2013);(5)Umebayashi et al (2016); (6) Martorell et al (2014); (7) Christman et al (2012); (8) Choat et al (2015); (9) Laur and Hacke (2014); (10) Mayr et al (2014); (11) Christensen-Dalsgaard et al (2014); (12)Rolland et al (2015); (13)Ganthaler and Mayr (2015); (14)Trifilo et al (2015); (15)Savi et al (2016); (16)Klein et al 2016; (17) Li et al (2016); (18)Chen et al (2017) …”

mentioning

confidence: 99%

Xylem embolism refilling and resilience against drought‐induced mortality in woody plants: processes and trade‐offs

Klein

Zeppel

Anderegg

et al. 2018

Ecological Research

138

View full text Add to dashboard Cite

Understanding which species are able to recover from drought, under what conditions, and the mechanistic processes involved, will facilitate predictions of plant mortality in response to global change. In response to drought, some species die because of embolism-induced hydraulic failure, whilst others are able to avoid mortality and recover, following rehydration. Several tree species have evolved strategies to avoid embolism, whereas others tolerate high embolism rates but can recover their hydraulic functioning upon drought relief. Here, we focus on structures and processes that might allow some plants to recover from drought stress via embolism reversal. We provide insights into how embolism repair may have evolved, anatomical and physiological features that facilitate this process, and describe possible trade-offs and related costs. Recent controversies on methods used for estimating embolism formation/repair are also discussed, providing some methodological suggestions. Although controversial, embolism repair processes are apparently based on the activity of phloem and ray/axial parenchyma. The mechanism is energetically demanding, and the costs to plants include metabolism and transport of soluble sugars, water and inorganic ions. We propose that embolism repair should be considered as a possible component of a 'hydraulic efficiency-safety' spectrum. We also advance a framework for vegetation models, describing how vulnerability curves may change in hydrodynamic model formulations for plants that recover from embolism.

show abstract

Diurnal dynamics of water transport, storage and hydraulic conductivity in pine trees under seasonal drought

Cited by 38 publications

References 51 publications

Mortality versus survival in drought‐affected Aleppo pine forest depends on the extent of rock cover and soil stoniness

Mortality versus survival in drought‐affected Aleppo pine forest depends on the extent of rock cover and soil stoniness

Environmental Controls on the Seasonal Variation in Gas Exchange and Water Balance in a Near-Coastal Mediterranean Pinus halepensis Forest

Xylem embolism refilling and resilience against drought‐induced mortality in woody plants: processes and trade‐offs

Contact Info

Product

Resources

About