A prolonged drought, strong berg winds, and a landscape choked by invasive alien plants created a “perfect storm” that led to the catastrophic and infamous Knysna Fires. Nearly 100,000 hectares of land were burnt (in 2018 alone, read more here), over 600 homes were destroyed, and devastatingly, seven human lives were lost.
The fire burned directly through the Heartland property, a patch of forestry near Southern Africa’s largest forest complex. The damage was severe and largely due to large-scale monoculture pine plantations in combination with invasive vegetation, such as pine and eucalyptus, which both contain high levels of flammable volatile oils, allowing them to burn far hotter and faster than naturally occurring fynbos fires.
Agents of Widespread Land Degradation
Wildfires are complex phenomena, ignited by a variety of factors, and can be caused naturally or by human intervention. Regardless of the initial spark, a fire requires three key elements to ignite and spread: fuel (such as dry vegetation or volatile oils), oxygen, and heat. The coastal mountain landscapes of the Western Cape have been shaped by a unique and intertwined relationship between forest and fynbos, with the latter relying on fire to thrive, while the afromontane forest evolved to be fire resilient.
This dance between fire, fynbos and forestland has shaped these landscapes for eons. Now, highly flammable invasive species, like pine, in large scale monoculture plantations spanning thousands of hectares – as well as eucalyptus and cattle – are literally adding fuel to the fire, contributing to catastrophic fire risk given observed wildfire trends locally and globally. In addition – post fires, the invasive feedback springs to life, in even higher density, compounding the fire risk even further.