The microscopic engine powering Australia's vast forest ecosystems

Nature · Published 29 October 2026 Swipe more like this →

In short: Beneath the towering canopy of Australia lies a secret world hidden under fallen leaves. This isn't just debris; it is a complex, living infrastructure where thousands of species work in unison to recycle nutrients and regulate the climate.

Australia’s forests are massive and diverse, covering 133.6 million hectares—roughly 17% of the country's land area. While much of this is native forest (98%), these ecosystems vary wildly from eucalyptus forests to tropical rainforests like the Wet Tropics in Queensland. The latter is considered a 'living museum of evolution,' housing some of the highest biodiversity on Earth and providing critical scientific insights into how life developed both in Australia and globally. Queensland holds the largest portion of these woods at 51.8 million hectares. The Northern Territory follows with 23.3 million hectares. Western Australia contributes 20.4 million hectares to the national total.

The health of these forests depends heavily on the 'leaf litter'—a layer of fallen branches and leaves that serves as a vital secret ecosystem. This layer is not waste; it is home to thousands of different plants, animals, and microscopic organisms. These decomposers, such as the Allothyrid Mite (Allothyrus australasiae), perform the essential work of breaking down dead organic matter into nutrients that trees need to grow. These microscopic decomposers turn coarse wood into a soft forest underlay. This diversity of micro-monsters is essential for sustaining forest systems. The leaf litter provides necessary nutrients for tree growth.

This decomposition process is a cornerstone of climate regulation, as it helps lock carbon into the soil. However, these systems are under pressure. While eucalyptus forests require fire to regenerate, climate change is intensifying natural cycles into disasters. Extreme wildfires fueled by drought and rising temperatures can destroy habitats and displace wildlife, highlighting the need for sophisticated land management like cultural burning to maintain a healthy balance between human and animal kin. First Nations peoples have historically used cultural burning to manage land risks. These traditional knowledges can help treat fire with respect. This approach supports the succession of all biodiversity across the landscape.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• Australia's oldest rainforests hold half the nation's species in a tiny sliver of land
• These ancient Australian rainforests are living relics of a long-lost supercontinent
• This Australian rainforest is 100 million years older than the Amazon
• One hectare of rainforest can hold 42,000 insect species and 313 tree species
• Australia’s hidden biodiversity thrives in a landscape of extreme contrasts
• Turning gorse-infested wasteland into a thriving forest took 30 years
• The secret subterranean social network connecting our forests
• Britain's hidden wilderness reveals a surprising diversity of wildlife
• Why birds are essential allies in the fight to protect forests
• A pristine forest remains untouched by human feet in Mozambique
• Ancient forests do more than grow trees; they pump the planet's water
• Europe's forests are losing biomass 46% faster than previously thought

More in Forests · More in Nature · Latest · A–Z · All topics