Classification by natural breaks (Jenks' optimization) into low, moderate, and high production forest categories delineated these areas more clearly (Figure 2).
Classification by natural breaks (Jenks' optimization) into low, moderate, and high production forest categories delineated these areas more clearly.
The forests concerned either have low production potential, are small areas, or areas that require large investment in access roads.
Then there are the low production costs.
Under Suharto, the government, through its 1967 Forestry Regulation and later reinforced by its forest land-use categories (production forest, protection forest, parks and reserves), claimed large portions of Indonesia's land for forests and forest plantations.
Additionally, Broich et al. [ 31] identified a relatively lower forest cover in 2000 within production forest and non-forest-use zones, and the greatest decrease in forest cover between 2000 and 2008, compared to other land allocation zones.
Production forest land was leased to corporations for logging and timber or pulp plantations.
After Bonferroni's correction, pairwise comparisons showed that the mean AGB was significantly lower in the non-forest land zone (M = 152, P < 0.001) compared to the other categories, and was significantly higher in watershed protection forest (M = 272) and the forest limited production zone (M = 253), compared to production forest (M = 193) and conservation forest (M = 211).
Low aboveground biomass densities can be found in the lowlands in burned areas, and in non-forest zones and production forests.
Low AGB or carbon stock lands, such as found in the lowlands in burned areas and in non-forest lands and production forests, should be considered for either regeneration or utilisation purposes, dependent on the regeneration capacity of the vegetation.
