Die hard: timberline conifers survive annual winter embolism
نویسندگان
چکیده
منابع مشابه
Uptake of water via branches helps timberline conifers refill embolized xylem in late winter.
Xylem embolism is a limiting factor for woody species worldwide. Conifers at the alpine timberline are exposed to drought and freeze-thaw stress during winter, which induce potentially lethal embolism. Previous studies indicated that timberline trees survive by xylem refilling. In this study on Picea abies, refilling was monitored during winter and spring seasons and analyzed in the laboratory ...
متن کاملFrost drought in conifers at the alpine timberline: xylem dysfunction and adaptations.
Drought stress can cause xylem embolism in trees when the water potential (psi) in the xylem falls below specific vulnerability thresholds. At the alpine timberline, frost drought is known to cause excessive winter embolism unless xylem vulnerability or transpiration is sufficiently reduced to avoid critical psi. We compared annual courses of psi and embolism in Picea abies, Pinus cembra, Pinus...
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Conifers growing at the alpine timberline are exposed to frost drought and freeze-thaw cycles during winter-stress factors known to induce embolism in tree xylem. The two dominant species of the European Central Alps timberline were studied: Norway spruce (Picea abies [L.] Karst) and stone pine (Pinus cembra), which usually reaches higher altitudes. We hypothesized to find embolism only at the ...
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Hatchlings of the painted turtle (Chrysemys picta marginata) are unique as the only reptile and highest vertebrate life form known to tolerate the natural freezing of extracellular body fluids during winter hibernation. Turtles survived frequent exposures to temperatures as low as -6 degrees C to -8 degrees C in their shallow terrestrial nests over the 1987-1988 winter. Hatchlings collected in ...
متن کاملAnnual Report 4 , Winter 2013
We study eective inference strategies for monotone trend functions in the presence of short range and long range dependence. Isotonic regression, which does not require specication of tuning parameters, is invoked to estimate the monotone trend. The problem of constructing reliable condence intervals for the trend function is addressed via the use of appropriate discrepancy statistics which ari...
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ژورنال
عنوان ژورنال: New Phytologist
سال: 2019
ISSN: 0028-646X,1469-8137
DOI: 10.1111/nph.16304