McDowell Lab
@McDowell_Trees
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We study #WhatKillsTrees @ PNNL!
Joined September 2019
Note we are open to empiricists or modelers for these postdoc and technician positions on plant physiological ecology responses to elevated CO2 and temperature.
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Check out this online seminar for the latest ideas on drought-induced tree mortality, by Tansley Medal winner Anna Trugman. Should be great!
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New postdoc and technician positions available on tree mortality.
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The competition for the Linus Pauling postdoctoral fellowship at PNNL is coming up, with a Nov 16 due date for applications. These fellowships allow research of your choosing in collaboration with a PNNL scientist. DM for more information.
pnnl.gov
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So stoked about this new experiment. Instead of droughting trees to death as we've done for decades, this time we are adding seawater to understand the impacts of elevated salinity on tree mortality. Very different, yet with strong physiological similarities during mortality!.
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All, a great new postdoc position working with myself and a broad group of scientists. Options include ecosystem ecology, tree physiology, and a great option available to the candidate is studying how coastal forest trees die! This will be a fun project!.
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A new one led by Alex Pivovaroff demonstrating that increasing rooting depth may allow tropical trees to withstand drought. A nice integration of data and modeling.
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Nice. this is what happens to the trees after they die. These are critical numbers for understanding the carbon consequences of tree mortality.
Out now and the cover story of this weeks @Nature: A global experiment led by @SebSeibold quantifies the C flux from deadwood (11 Pg) and highlights the functional importance of insects for deadwood decomposition.
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More forest dynamics, this time on the coastlines.
Via @McDowell_Trees , White et al. in @EcosystemsJ : Climate Change Driving Widespread Loss of Coastal Forested Wetlands Throughout the North American Coastal Plain.
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This is a great chance for undergraduates to work with DOE scientists. Check it out if interested.
The Science Undergraduate Laboratory Internships (SULI) Program is now accepting applications for the 2022 Spring Term.
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More bad news for SW USA pines from the Sevilleta drought experiment. Trees turning brown, super low water potentials, insects abound. but it did rain a tad bit this week so lets see. .
Good times were had at out Sevilleta, NM experiment the other week. Stressed Pinus edulis had water potentials ranging from -2.5 to -7.5 MPa. (Yes, 3 twigs ~7-7.5 MPa!) With @amy_trowbridge @ecofiz1 @ShealynMalone @PeltierDrew @McDowell_Trees @wtp_abq
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Clever one led by Rutuja Chitra-Tarak suggesting a relationship between rooting depth and hydraulic resistance to embolism in the tropics. Very nice!.
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New one led by Hongxia Zhang examining hydraulic function conifers dying from seawater exposure. Nice results and compelling interpretation. upland trees do not like novel seawater exposure!.
Seawater exposure causes hydraulic damage in dying Sitka-spruce trees #PlantSci #AbioticStress @hongxia0618 @McDowell_Trees
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A useful statistical approah for all of us that measure water potentials to quantify drought impacts on plants.
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New one from down-under: a look at the potentially critical role of CO2 in mitigating drought and rising vapor pressure deficit impacts on plants.
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Don't miss it! The big summary on what we know about drought and heat related tree mortality. Should be a good one!.
Please join us for Craig Allen’s talk on #treemortality under hotter droughts 🌲🌲 tomorrow 🌳 🌳 Register now, places are filling up quickly.
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Wow. global estimates (sattelite driven) of increasing water stress impacts on growth, with progressive increases in drought sensitivity and shrinking on non-drought impacted areas.
"Increasing water constraints associated with increasing drought impacts are hidden in overall greening trends, with plants becoming increasingly sensitive to drought". Observed increasing water constraint on vegetation growth over the last three decades
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Nice one from Alex Pivovaroff--homeostatic traits across a Panamanian climate gradient, but strong role of hydraulics on species moisture dependencies.
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We have a new postdoctoral fellowship available to study the response of tropical forests to climate, and the associated physiological mechanisms underlying growth and survival. Awesome field sites throughout the tropics. If interested, check out
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