Aerial Seeding Saves Ancient Forests from Fire's Fury

Southeastern Australia's mountain ecosystems, vital habitats for native species, are increasingly vulnerable to climate change-induced wildfires. These fires are occurring with greater frequency and outside typical patterns, overwhelming the natural recovery capacity of forests.

A significant challenge arises from the unique biology of alpine ash trees, which are obligate seeders. Unlike some eucalyptus species that can resprout, these trees are killed by intense fires, relying solely on canopy seeds for regeneration. A study highlighted how closely spaced fires between 2003 and 2013 pushed these trees to the brink of extinction.

To combat this, an innovative aerial seeding project was launched, using planes and helicopters to distribute millions of seeds across affected areas like Alpine National Park. This intervention aims to re-establish forests where natural seed sources were destroyed by recent, intense bushfires that occurred too close together for young trees to mature.

Research indicates that seedlings from aerially sown seeds show promising survival rates, comparable to those from natural regeneration. However, land managers must protect these young trees from further fires for approximately twenty years, allowing them to mature and produce seeds for future generations.