Areas established within a unit of the National Forest System shall include not less than 50 percent of the National Forest System lands in that unit identified as commercial forest land capable of producing twenty cubic feet of timber per acre. (2) Reduction prohibited Except as provided in paragraph (3), once a Forest Active Management Area is established, the Secretary may not reduce the number of acres of National Forest System land included in that Forest Active Management Area. (3) Collaborative adjustment authority The Secretary may reduce the number of acres of National Forest System land included in a Forest Active Management Area, including an acreage reduction resulting in the inclusion of a quantity of commercial forest land below the percentage required by paragraph (1) and section 101(5)(B), if the reduction is developed and agreed upon through a collaborative process. (g) Map The Secretary shall submit a map of all Forest Active Management Areas established under subsection (a) and a map of any Forest Active Management Area whose acreage is adjusted made pursuant to subsection (f)(3)— (1) to the Committee on Agriculture and the Committee on Natural Resources of the House of Representatives