There is a large spectrum of harvesting behaviors in forest systems on Earth. However, in the absence of global data and a model to describe harvesting behavior in various types of forest institutional agreements, the choice was made to use the dataset and model of Canham, Rogers & Buchholz (2013) (link). This model represents the most accomplished effort to date to predict the probability of individual RUs of harvesting trees in forests in the United States. It describes a succession of decisions that emerge at three scales of observation: at the stand level (biomass and basal area), at the species level (21 species with a wide spectrum of LHTs), and at the individual tree level (size). The main interest of this dataset and model is that the harvesting rates are assumed to match every species’ ecological state and biological characteristic considered in the RI model. For this reason, any harvesting model combined with the multi-species forest model is assumed to independently apply sustainable harvesting rates on every species, but without making prior assumptions about their impact on the demographic structure and dynamics of other competing species not directly impacted by each specific harvesting rate. Therefore, applying a diversity of species-specific harvesting rates, simultaneously or as a temporal succession, is expected to impact the coexistence of tree species within the forest in a complex way.
Consistent with Canham, Rogers & Buchholz (2013) (link), the harvesting behavior of individual RUs can be modeled as a hierarchical chain of four decisions:

Decision 2.3.1.1 (stand level): the RU decides whether or not to harvest given the biomass state of the forest and the average timber density of the trees.

Decision 2.3.1.2 (stand level): the RU determines the average basal area harvested given the average timber density of the trees.

Decision 2.3.1.3 (species level): the RU determines the probability for every tree species to be harvested based on its life-history traits (SWD, SS/maximal height of the tree species, SLA).

Decision 2.3.1.4 (individual tree level): the RU determines the probability for every tree to be harvested given its size (diameter at breast height dbh).

Using this approach, it becomes possible to predict the supply of timber for every species at a given year of harvest. These four decisions are now explained in detail.
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