But there are some areas which are just as desolate as they were after fires swept through.

Australian National University ecologist Dr Ben Scheele visited the eastern part of the park this week, which was one of the areas hardest hit by the Orroral Valley fire due to its hilly terrain and the dry conditions.

There's been little change in the area since April, even though other areas of the park are bouncing back.

"Anecdotally, you can see the vegetation is recovering much quicker in areas that were burnt less severely," Dr Scheele said.

Australian National University senior lecturer Dr Marta Yebra flew over Namadgi to assess the damage in the aftermath of the fires.

She found 45 per cent of the burnt areas were impacted at a high severity, which could explain the lack of regeneration.

"Research has shown less regeneration or resprouting in areas that have been repeatedly burned," Dr Yebra said.

"On the other hand, low-intensity fuel-reduction fires [like] prescribed burning programs can reduce the fire severity and therefore facilitate regeneration."

With the Orroral Valley fire, Dr Yebra's research showed that deep within the interior, areas that had already been burnt nine months earlier were almost untouched. Areas burnt four years previously were mostly burnt by the fire but at a lower severity.

Rain - or the lack of it at the right time - has also played a role.

Australian National University Fenner School professor of water science Albert Van Dijk has examined bushfire recovery across Australia after the Black Summer fires.

While northern NSW and the Central Coast received great dumps in February and March, meaning 63 per cent of lost leaf areas had recovered by June, "it took a bit longer for the rain to come through the south".

When the rain did come through, the weather had turned cold and the vegetation did not respond as fast, Professor Van Dijk said. It meant only 43 per cent of vegetation had recovered in south-east Australia by June.

"That said, I wouldn't necessarily see that as a lasting negative. Once it starts to warm up again, I think you can expect that a lot of those trees will start to get new growth as well," he said.

However there are concerns about the long-term recovery of the area, and the precious threatened species which call it home.

Dr Scheele said the area he visited was also devastated by the 2003 Canberra fires.

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Research had shown forests of an intermediate age - 10, 15 or even 20 years old - contained higher fuel loads than older forests.

If severe fires continued to sweep through these areas at increasing intervals due to climate change, they would become more combustible and the ecosystem may not have time to recover.

"I think it would be probably highly unlikely the ecosystem could withstand that," Dr Scheele said.

Dr Van Dijk warned it would become more difficult for species to bounce back if the impacts of climate change were not addressed.

"The last big fire before this year was 2003. I think that is still an interval or a period that that these forests and these ecosystems can reasonably well recover from," Dr Van Dijk said.

"But if it gets more often than that, then we'll probably start to lose a lot [of species]. You start to lose big trees and you start to lose all the all the wildlife that depends on it.

"That really depends on climate change. So we know that we really have to get serious about stopping greenhouse gas emissions."