Physiological Significance of Hydraulic Segmentation, Nocturnal Transpiration and Capacitance in Tropical Trees: Paradigms Revisited

Goldstein, Guillermo; Scholz, Fabián Gustavo; Meinzer, Frederick C.

doi:10.1007/978-3-319-27422-5_9

Cited by 15 publications

(13 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other studies of C ft,x have found that although the water derived from capacitive processes may only comprise 10–30% of total daily transpiration, there can be a strong buffering effect of C ft,x on plant water status (Sperry et al ., ). Daily minimum xylem water potential tends to increase with increasing capacitance across a range of tropical forest studies (Meinzer et al ., , ; Scholz et al ., ), suggesting that the buffering effect of C ft,x on daily fluctuations in xylem water potential can dampen the magnitude of the trade‐off between xylem safety and efficiency (Sperry et al ., ; Bucci et al ., ). This appears to be the case in the humid lowland tropical forest of Paracou, where soil water deficit is relatively rare, relative humidity is usually above 85%, and C ft,x shows greater coordination with other hydraulic traits than P 50 .…”

Section: Discussionmentioning

confidence: 97%

“…This potential artefact is important to consider because it should be proportional to the amount of vessels and therefore k s,max,x . However, because it should only affect the initial points of the curve, this technique is still widely used for calculating C ft,x (Meinzer et al, , 2009Sperry et al, 2008;Bucci et al, 2016;De Guzman et al, 2017).…”

Section: Sapwood Pressure-volume Curves and Wood Densitymentioning

confidence: 99%

“…New Phytologist water potential can dampen the magnitude of the trade-off between xylem safety and efficiency (Sperry et al, 2008;Bucci et al, 2016). This appears to be the case in the humid lowland tropical forest of Paracou, where soil water deficit is relatively rare, relative humidity is usually above 85%, and C ft,x shows greater coordination with other hydraulic traits than P 50 .…”

Section: Researchmentioning

confidence: 99%

See 2 more Smart Citations

Coordination and trade‐offs among hydraulic safety, efficiency and drought avoidance traits in Amazonian rainforest canopy tree species

et al. 2018

View full text Add to dashboard Cite

Predicting responses of tropical forests to climate change-type drought is challenging because of high species diversity. Detailed characterization of tropical tree hydraulic physiology is necessary to evaluate community drought vulnerability and improve model parameterization. Here, we measured xylem hydraulic conductivity (hydraulic efficiency), xylem vulnerability curves (hydraulic safety), sapwood pressure-volume curves (drought avoidance) and wood density on emergent branches of 14 common species of Eastern Amazonian canopy trees in Paracou, French Guiana across species with the densest and lightest wood in the plot. Our objectives were to evaluate relationships among hydraulic traits to identify strategies and test the ability of easy-to-measure traits as proxies for hard-to-measure hydraulic traits. Xylem efficiency was related to capacitance, sapwood water content and turgor loss point, and other drought avoidance traits, but not to xylem safety (P ). Wood density was correlated (r = -0.57 to -0.97) with sapwood pressure-volume traits, forming an axis of hydraulic strategy variation. In contrast to drier sites where hydraulic safety plays a greater role, tropical trees in this humid tropical site varied along an axis with low wood density, high xylem efficiency and high capacitance at one end of the spectrum, and high wood density and low turgor loss point at the other.

show abstract

Section: Discussionmentioning

confidence: 97%

Section: Sapwood Pressure-volume Curves and Wood Densitymentioning

confidence: 99%

Section: Researchmentioning

confidence: 99%

See 1 more Smart Citation

Coordination and trade‐offs among hydraulic safety, efficiency and drought avoidance traits in Amazonian rainforest canopy tree species

et al. 2018

View full text Add to dashboard Cite

show abstract

“…December 2017). Furthermore, evidence shows that most types of plants in every biome where it has been examined continue to lose water to some degree through their open stomata at night-the degree of this nocturnal transpiration varies among species, and the functional significance is not well understood, though it may (at least in some cases) relate to competition for nutrients (Dawson et al 2007;Cramer et al 2009;Rosado et al 2012;Bucci et al 2016). Night-time sap-flow and transpiration are greatest in species with rapid growth, high concentrations of leaf nitrogen and lower shade tolerances (Marks and Lechowicz 2007).…”

Section: Vapourmentioning

confidence: 99%

Forests, atmospheric water and an uncertain future: the new biology of the global water cycle

Sheil

2018

For. Ecosyst.

145

View full text Add to dashboard Cite

Theory and evidence indicate that trees and other vegetation influence the atmospheric water-cycle in various ways. These influences are more important, more complex, and more poorly characterised than is widely realised. While there is little doubt that changes in tree cover will impact the water-cycle, the wider consequences remain difficult to predict as the underlying relationships and processes remain poorly characterised. Nonetheless, as forests are vulnerable to human activities, these linked aspects of the water-cycle are also at risk and the potential consequences of large scale forest loss are severe. Here, for non-specialist readers, I review our knowledge of the links between vegetation-cover and climate with a focus on forests and rain (precipitation). I highlight advances, uncertainties and research opportunities. There are significant shortcomings in our understanding of the atmospheric hydrological cycle and of its representation in climate models. A better understanding of the role of vegetation and tree-cover will reduce some of these shortcomings. I outline and illustrate various research themes where these advances may be found. These themes include the biology of evaporation, aerosols and atmospheric motion, as well as the processes that determine monsoons and diurnal precipitation cycles. A novel theory-the 'biotic pump'-suggests that evaporation and condensation can exert a major influence over atmospheric dynamics. This theory explains how high rainfall can be maintained within those continental land-masses that are sufficiently forested. Feedbacks within many of these processes can result in non-linear behaviours and the potential for dramatic changes as a result of forest loss (or gain): for example, switching from a wet to a dry local climate (or visa-versa). Much remains unknown and multiple research disciplines are needed to address this: forest scientists and other biologists have a major role to play. New ideas, methods and data offer opportunities to improve understanding. Expect surprises.

show abstract

“…Plants that do not exhibit this trait sequence are expected to avoid drought damage by limiting water stress (i.e., maintaining a high Ψ min, MD relative to thresholds for damage) through deep roots, capacitance from stored water, drought deciduousness, or a preference for mesic environments (21,22), or to experience significant damage at Ψ min, MD and survive through recovery processes (23).…”

mentioning

confidence: 99%

The correlations and sequence of plant stomatal, hydraulic, and wilting responses to drought

Bartlett

Klein

Jansen

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

419

346

View full text Add to dashboard Cite

Climate change is expected to exacerbate drought for many plants, making drought tolerance a key driver of species and ecosystem responses. Plant drought tolerance is determined by multiple traits, but the relationships among traits, either within individual plants or across species, have not been evaluated for general patterns across plant diversity. We synthesized the published data for stomatal closure, wilting, declines in hydraulic conductivity in the leaves, stems, and roots, and plant mortality for 262 woody angiosperm and 48 gymnosperm species. We evaluated the correlations among the drought tolerance traits across species, and the general sequence of water potential thresholds for these traits within individual plants. The trait correlations across species provide a framework for predicting plant responses to a wide range of water stress from one or two sampled traits, increasing the ability to rapidly characterize drought tolerance across diverse species. Analyzing these correlations also identified correlations among the leaf and stem hydraulic traits and the wilting point, or turgor loss point, beyond those expected from shared ancestry or independent associations with water stress alone. Further, on average, the angiosperm species generally exhibited a sequence of drought tolerance traits that is expected to limit severe tissue damage during drought, such as wilting and substantial stem embolism. This synthesis of the relationships among the drought tolerance traits provides crucial, empirically supported insight into representing variation in multiple traits in models of plant and ecosystem responses to drought. drought tolerance | stem hydraulics | leaf hydraulics | stomatal closure | turgor loss point P lants worldwide are expected to face more frequent and severe droughts under climate change (1). Characterizing drought tolerance for diverse species is key to improved predictions of ecosystem responses to global change (2), and ecological and phylogenetic patterns have been established across many species for individual drought tolerance traits (3-7). However, plant drought tolerance is determined by multiple traits. The relationships among traits within plants and across species have not been evaluated for general patterns across global plant diversity. We synthesized the published data to elucidate global patterns in the relationships among stomatal, hydraulic, and leaf mesophyll drought tolerance traits. We evaluated the roles of functional coordination, covariance with water stress, and shared ancestry in driving trait correlations across species. Additionally, we focused on clarifying relationships among drought tolerance traits within plants of given species, i.e., determining the sequence of their water potential thresholds.Classical drought tolerance traits quantify the water potentials that induce declines in key physiological processes, such as stomatal conductance, hydraulic conductivity, and cell turgor pressure. Previous studies have shown that these water potential thresholds are i...

show abstract

Physiological Significance of Hydraulic Segmentation, Nocturnal Transpiration and Capacitance in Tropical Trees: Paradigms Revisited

Cited by 15 publications

References 72 publications

Coordination and trade‐offs among hydraulic safety, efficiency and drought avoidance traits in Amazonian rainforest canopy tree species

Coordination and trade‐offs among hydraulic safety, efficiency and drought avoidance traits in Amazonian rainforest canopy tree species

Forests, atmospheric water and an uncertain future: the new biology of the global water cycle

The correlations and sequence of plant stomatal, hydraulic, and wilting responses to drought

Contact Info

Product

Resources

About