The model user can also force the land in forest area to increase or decrease at the expense of crop and grazing land via a forest multiplier forestm . The change in forestland, LDSHIFT, is bound. In the case of an increase, i.e., forestm > 1, the amount of added land is limited to 20 percent of crop and grazing land; in the case of a decrease, i.e., forestm < 1, the amount of forest land removed is limited to 20 percent of existing forest land.

The amount of land taken from cropland and grazing land is proportional to the amount of each.