Embolism resistance drives the distribution of Amazonian rainforest tree species along hydro‐topographic gradients

New Phytologist, Год журнала: 2018, Номер 221(3), С. 1457 - 1465

Опубликована: Окт. 8, 2018

Summary Species distribution is strongly driven by local and global gradients in water availability but the underlying mechanisms are not clear. Vulnerability to xylem embolism (P 50 ) a key trait that indicates how species cope with drought might explain plant patterns across environmental gradients. Here we address its role on sorting along hydro‐topographical gradient central Amazonian rainforest examine variance at community scale. We measured P for 28 tree species, soil properties estimated hydrological niche of each using an indicator distance table ( HAND ). found large hydraulic diversity, covering as much 44% angiosperm variation . show : contributes segregation hydro‐topographic Amazon, thus coexistence; result repeated evolutionary adaptation within closely related taxa; associated tolerance P‐poor soils, suggesting evolution stress‐tolerance syndrome nutrients drought; higher trees valleys than uplands. The observed diversity association topography has important implications modelling predicting forest resilience climate change.

Язык: Английский

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Greater focus on water pools may improve our ability to understand and anticipate drought‐induced mortality in plants

New Phytologist, Год журнала: 2018, Номер 223(1), С. 22 - 32

Опубликована: Дек. 18, 2018

Drought-induced tree mortality has major impacts on ecosystem carbon and water cycles, is expected to increase in forests across the globe with climate change. A large body of research past decade advanced our understanding plant relations under drought. However, despite intense research, we still lack generalizable, cross-scale indicators risk. In this Viewpoint, propose that a more explicit consideration pools could improve ability monitor anticipate Specifically, focus relative content (RWC), classic metric relations, as potential indicator risk physiologically relevant integrates different aspects related hydraulics, stomatal responses economy Measures are likely have strong mechanistic link be integrative, threshold-prone relatively easy measure at spatial scales, may complement current metrics based potential, loss hydraulic conductivity nonstructural carbohydrates. We discuss some advantages limitations these capacity predict drought-induced mortality.

Язык: Английский

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Responses to drought stress in Prunus sargentii and Larix kaempferi seedlings using morphological and physiological parameters

Forest Ecology and Management, Год журнала: 2020, Номер 465, С. 118099 - 118099

Опубликована: Март 31, 2020

Язык: Английский

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Detecting forest response to droughts with global observations of vegetation water content

Global Change Biology, Год журнала: 2021, Номер 27(23), С. 6005 - 6024

Опубликована: Сен. 3, 2021

Droughts in a warming climate have become more common and extreme, making understanding forest responses to water stress increasingly pressing. Analysis of trees has long focused on potential xylem leaves, which influences stomatal closure flow through the soil-plant-atmosphere continuum. At same time, changes vegetation content (VWC) are linked range tree responses, including fluxes carbon, mortality, flammability, more. Unlike potential, requires demanding situ measurements, VWC can be retrieved from remote sensing particularly at microwave frequencies using radar radiometry. Here, we highlight key frontiers significantly increase our stress. To validate observations landscape scale better relate them data assimilation model parameters, introduce an ecosystem-scale analog pressure-volume curve, non-linear relationship between average leaf or branch commonly used plant hydraulics. The sources variability these curves their response discussed. We further show what extent diel, seasonal, decadal dynamics reflect variations different processes relating also for inferring belowground conditions-which difficult impossible observe directly. Lastly, discuss how dedicated geostationary spaceborne observational system VWC, when combined with existing datasets, capture diel seasonal advance science applications global vulnerability future droughts.

Язык: Английский

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

Ecological Research, Год журнала: 2018, Номер 33(5), С. 839 - 855

Опубликована: Март 10, 2018

Язык: Английский

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