A significant number of jobs lost in Te Urewera were scientists who monitored health of flora and fauna and informed policy, he said.
"How will the department maintain a service that will diminish with the loss of this money and staff? That is what we are interested in."
Mr Kruger said Tuhoe had met DoC's deputy director-general and senior staff seeking assurances that agreed governance sharing would still be delivered as promised, despite the cutbacks.
A "standard issue of statements wanting to calm and allay fears" had been received.
"We will be looking for an assurance at a ministerial level, that what we have negotiated with the Crown is not watered down."
Mr Kruger said the DoC cuts would likely affect treaty settlements that had already been made.
"A count needs to be made - how can DoC meet all these commitments?"