STOCK grazing can be beneficial rather than harmful to forest health, according to new research by a NSW Government forest expert.

The research, by State Forests NSW silviculturist Vic Jurskis, found that in the absence of burning off, grazing could effectively control exotic weed species that thrive in forest areas.

"Frequent fire removes leaf litter and the seedlings from trees and shrubs, helping to maintain soil conditions," Mr Jurskis said.

"Grazing performs a similar role to these fires.

"If we exclude stock from forest areas we could cause problems, particularly the increased density and loss of control over native weeds."

The research was carried out across Australia and took Mr Jurskis 10 years.

It has been seized on by opponents of the Victorian Environmental Assessment Council's proposal to lock up more river red gum forests in national parks.

The Rivers and Red Gum Environment Alliance, which is campaigning against VEAC's proposals, said the research highlighted the dangers of locking up more forest.

Secretary Max Rheese said a ban on grazing in the red-gum forests would lead to a decline in tree health from an overgrown understorey and a build-up of litter in the forests.

"Cattlemen have long argued that grazing is essential not only for their livelihood but for the health of the forests," Mr Rheese said.

"They have struggled to prove it but this research is the proof they need."

Piangle Grazier Ian Hickory said the Nyah, Vinifera and Lindsay Island forests that had already been closed to stock had been gradually taken over by weeds.

"Our biggest problem is the native cherry,"Mr Hickory said. "But the weed is quite palatable to stock and grazing also helps facilitate the establishment of new plants."

Last month, Planning Minister Gavin Jennings announced a new community engagement panel to work through VEAC's recommendations. The panel will carry out more community consultation before advising the Government on the management of the river red gum area.

Advisory panel chairman John McQuilten said any research that was relevant would be considered.

Mr McQuilten said he had requested a copy of Mr Jurskis' research report so the panel could take its findings into consideration.