Biomass Mortality

 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.

• About Convective Storms: Small, localized weather events marked by vertical instability, strong winds, and frequent lightning.

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.

• Key Findings : Amazon forest inventory data shows that 51% of all trees die from being broken or uprooted, largely due to high winds.

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.