Many of those forests affected are Maori-owned and some have been set aside for Treaty settlements.
"Today's decisions are a reflection of the balanced and responsible approach this Government has taken to reducing greenhouse gas emissions" Mr Groser said in a statement.
"They offer Kiwi exporters, employers and households certainty in a challenging and changing world economy."
The decisions announced today followed consideration of the recommendations of the ETS Review Panel, what those affected by the ETS were saying, and a review of what New Zealand's trading partners are doing as well as feedback through community consultation.
"The National-led Government remains committed to doing its part to reduce greenhouse gas emissions, but it is worth noting that we are the only country outside Europe with a comprehensive ETS," Mr Groser said.
"In these times of uncertainty, the Government has opted not to pile further costs on to households and the productive sector."
The Goverment would release more information about the changes later this week and legislation giving effect to them will be introduced later this year.