theIASHub | 05 Jul, 2025 | 15
Biomass Mortality : Recently, a study published in Ecology Letters revealed that short-lived yet intense convective storms are significantly accelerating tree mortality in tropical regions, especially in the Amazon.
o Though they cover relatively small areas compared to hurricanes or typhoons, their high wind speeds and lightning strikes can cause disproportionate destruction:
ü Wind damage: Uproots or breaks trees, which often crash into and damage neighboring trees.
ü Lightning strikes: A single bolt can damage up to 24 trees and kill five, even without fire.
o These storms may account for 12% to 118% of the observed rise in biomass mortality.
o Wind and lightning from these storms are estimated to be responsible for 30–60% of total tropical tree mortality.
o Lethal Role of Lightning: A single lightning strike can affect 24 trees and kill five, even without causing fire. Tropical forests face 35–67 million lightning strikes annually, killing billions of trees.
o Thunderstorm activity in the tropics has increased by 5–25% per decade over the past 50 years, a trend expected to worsen with global warming.
o Carbon Sink at Risk: Rising storm-related tree deaths are weakening the carbon absorption capacity of tropical forests, making storms as destructive as droughts and heat stress in terms of forest carbon balance.
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