Dynamic Stand Attributes

Dynamic stand attributes describe the growth and change of any quantifiable stand characteristic. Dynamic stand attributes are age dependent and change over time with the age of the stand. Attributes typically describe physically measurable values such as growing stock, height, amount of course woody debris, or stems per hectare. Stand attributes are also commonly used to classify the polygon, for example: area by forest type, area by seral stage class, or area by habitat association. Stand attributes are defined in the input datasets and are matched to every block in the model. Every period in the planning horizon is represented in the attribute table so every stand attribute can be represented by a curve. Stand attributes are also area-weighted average attribute curves that represent aggregate conditions for all fragments in a block.

Figure 21. Example attribute curves

Each block is associated with many dynamic stand attributes that can be illustrated by time dependent curves.

It may seem a bit daunting that there are so many attributes as well as so many sets of for every current and future stand condition. It is very seldom, however, that attributes are generated from scratch for a Patchworks analysis. Attributes can be imported from existing non-spatial models such as Woodstock, SFMM or Sylva or converted from a spreadsheet of database system into the format required for the Patchworks forest model xml language.