Aseasonal leaf abscission in Populus induced by volcanic ash
1Department of Forestry and Range Management, Washington State University, 99164, Pullman, WA, USA.
Oecologia
|March 18, 2017
Summary
Mount St. Helens volcanic ash caused premature leaf drop in Populus trees. Abrasion from ash particles damaged leaf tissues, leading to turgor loss and leaf abscission.
Area of Science:
- Plant Science
- Environmental Science
- Ecology
Background:
- Volcanic ashfall can impact plant physiology and survival.
- Populus trees are economically and ecologically significant in many regions.
Purpose of the Study:
- To investigate the physiological response of Populus to volcanic ash abrasion.
- To determine the mechanism behind premature leaf abscission following ashfall.
Main Methods:
- Simulated ashfall abrasion on Populus nigra var. italica leaves under glasshouse conditions.
- Assessment of leaf tissue damage, turgor, and stomatal conductance.
Main Results:
- Abrasion of leaf epidermis and mesophyll by ash particles.
- Permanent loss of leaf turgor and reduced stomatal conductance observed.
- Substantial abscission of still-green leaves occurred.
Conclusions:
- Wind-borne volcanic ash can cause significant physical damage to Populus leaves.
- Leaf abrasion is a likely cause of premature leaf abscission following ashfall events.
- This damage mechanism highlights a potential threat to vegetation from ash-laden winds.
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