Ultrasound reveals why some trees can recover after drought and others die.
. Delving into the underlying mechanisms explained this difference.
through a tree’s thousands of tiny vessels — evaporation from pores in leaves drives water up the trunk . But if there’s insufficient water in the soil, this upward pull can generate embolisms that clog vessels. In the experiments, spruces pinged much more than beeches, suggesting they had far more embolisms.
Beeches suffered fewer embolisms than the spruce, even though they kept their pores open longer than the conifers did. Perhaps that’s because beeches have roots that extend into deeper, wetter soil as well as more robust water reserves, Beikircher says. Another set of experiments after the researchers relieved the drought suggests that’s the case.
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