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Trees Are in Trouble: New Research Flips the Script on Forest Resilience

December 18, 2023
in Science
Trees Are in Trouble: New Research Flips the Script on Forest Resilience
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Tree Trouble Climate Change Concept

Recent research indicates that trees in wetter regions are more vulnerable to drought, challenging previous beliefs about tree resilience. This study, involving the analysis of over 6.6 million tree rings, reveals that trees in drier areas are surprisingly resilient to drought. The findings underscore the widespread impact of climate change on forests and suggest that genetic diversity in drier regions could be crucial for adapting to changing conditions. Credit: SciTechDaily.com

Scientists flip the script, revealing trees in wetter regions are more sensitive to drought.

This holiday season brings surprising news about your Christmas tree. Scientists just discovered that globally, trees growing in wetter regions are more sensitive to drought. That means if your tree hails from a more humid clime, it’s likely been spoiled for generations.

Debate Over Drought Resilience in Trees

Scientists have long debated whether arid conditions make trees more or less resilient to drought. It seems intuitive that trees living at their biological limits will be most vulnerable to climate change, since even just a little extra stress could tip them past the brink. On the other hand, these populations have adapted to a harsher setting, so they might be more capable of withstanding a drought.

Forest Trees Cascade Range of Washington

The trees in this lush, temperate forest in the Cascade Range of Washington are likely less resistant to drought than their counterparts in drier regions to the south. Credit: Joan Dudney

Insights From a New Study

According to a new study in the journal Science by researchers at UC Santa Barbara and UC Davis, greater water availability could “spoil” trees by reducing their adaptations to drought. “And that’s really critical to understand when we’re thinking about the global vulnerability of forest carbon stocks and forest health,” said ecologist Joan Dudney, an assistant professor at UCSB’s Bren School of Environmental Science & Management and in the Environmental Studies Program. “You don’t want to be a ‘spoiled’ tree when facing a major drought.”

Dudney and her co-authors expected trees growing in the most arid regions to be more sensitive to drought, since they’re already living at the edge of their limits. What’s more, climate change models predict that these regions will experience more rapid drying than wetter regions. This shift in climate could expose trees to conditions beyond their adaptive capacity.

Methodology: Analyzing Tree Rings

To measure drought sensitivity, the authors analyzed 6.6 million tree ring samples from 122 species worldwide. For each year, they measured whether the tree grew faster or slower than average based on its ring width. They linked these trends with historic climate data, including precipitation and temperature.

The team then compared drought responses across different regions. “As you move to the drier edge of a species’ range, trees become less and less sensitive to drought,” said lead author Robert Heilmayr, an environmental economist also in the Environmental Studies Program and at the Bren School. “Those trees are actually quite resilient.”

Dudney, Heilmayr, and their co-author Frances Moore were inspired, in part, by the work of UCSB professor Tamma Carleton on the effects climate change has on human populations. “This paper highlights the value of cross-disciplinary scientific work,” added Moore, an associate professor at UC Davis. “We were able to adapt methods from economics originally developed to study how people and businesses adjust to a changing climate and apply them to the ecological context to study forest sensitivity to drought.”

“A heatwave is likely to kill more people in a cool place like Seattle than in hotter cities like Phoenix,” Heilmayr said. The Southwest is already quite hot, so heatwaves there are scorching. But the region’s cities are adapted to an extreme climate, he points out. Now we know that forests display similar trends.

Implications for Warmer Regions

Unfortunately, warmer regions are slated to get disproportionately drier in the coming decades. “There is a pretty large portion of species’ ranges that are going to face a completely novel climate, something that those species don’t see anywhere in their range today,” Heilmayr explained. The authors found that 11% of an average species’ range in 2100 will be drier than the driest parts of their historic range. This increases to over 50% for some species.

“Broadly, our research highlights that very few forests will be unaffected by climate change,” Dudney said. “Even wetter forests are more threatened than we thought.”

But there is a flip side of the coin. Species have a reservoir of drought-hearty stock in the drier parts of their range that could bolster forests in wetter areas. Previous research out of UCSB revealed that many species do have the capacity to adapt to environmental change. However, those researchers also found that trees migrate slowly from one generation to the next. That means human intervention — such as assisted migration — may be necessary in order to take advantage of this genetic diversity.

Fate of Christmas Trees and Forests

Whether your Christmas trees grow in a dry or wet region, they’ll likely experience growth declines in the future. But understanding how trees will respond to climate change can help ensure the future of the Tannenbaum and its wild counterparts.

Reference: “Drought sensitivity in mesic forests heightens their vulnerability to climate change” by Robert Heilmayr, Joan Dudney and Frances C. Moore, 7 December 2023, Science.
DOI: 10.1126/science.adi1071

>>> Read full article>>>
Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/trees-are-in-trouble-new-research-flips-the-script-on-forest-resilience/

Tags: sciencetreesTrouble
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