Giant tropical trees, exceeding 70 meters in height, have been found to effectively transport water to their tops, maintaining drought resilience akin to smaller trees. A study published on July 2, 2026, in the journal Science highlights these trees' internal adaptations that allow them to thrive even during severe droughts.
Understanding Water Transport in Tall Trees
Research has traditionally suggested that taller trees face challenges in transporting water due to the greater distance between roots and leaves and the effects of gravity. However, this new study reveals that the xylem conduits—microscopic tubes that transport water and nutrients—increase in diameter as the tree grows taller. This adjustment compensates for the increased resistance to water flow, making it easier for these trees to transport water even under drought conditions.
Paulo Bittencourt, a professor at Cardiff University and a lead author of the study, noted, "There’s little data on how a plant’s hydraulic functions change as it grows. We were very surprised by the results of our study, which showed that they have an internal adjustment mechanism." This research challenges the long-held belief that taller trees are more susceptible to water stress.
Leaf Adaptations to Drought Conditions
In addition to their water transport mechanisms, the study found that the leaves of these giant trees adapt to lower hydration levels during droughts. This adaptation allows them to maintain their function without significant loss of photosynthesis. As water potential becomes more negative due to gravity, leaves tend to wilt and close their stomata earlier. However, these trees have developed increased tolerance to such conditions.
- Giant trees can reach heights of 70 meters (230 feet).
- They maintain growth rates similar to smaller trees during droughts.
- Internal adaptations in xylem conduits enhance water transport.
- Leaves exhibit increased tolerance to lower hydration levels.
The Role of Giant Trees in Climate Change
The findings of this research not only enhance our understanding of the biology of giant trees but also underscore their importance in combating climate change. Bittencourt explained that 1% of the largest trees on the planet store more than half of the carbon in tropical forest ecosystems. These trees also play a vital role in the rainfall cycle through their process of evapotranspiration.
The study involved a sample of 38 Dipterocarpaceae trees located in the Kabili-Sepilok Forest Reserve in Malaysia, known for its biodiversity and conservation efforts. The insights gained from this research can guide conservation efforts aimed at maintaining the balance of the carbon cycle and biodiversity in tropical forests.
🤖 This article was rewritten by Feed and Figures' editorial AI from a report originally published by Phys.org. Facts and quotes are preserved from the original; the rewrite focuses on clarity and structure. For the unedited original, see the source link below.
