Publisher's Synopsis
Excerpt from Sensitivity of the Western Root Disease Model: Inventory of Root Disease
In the following example, the stand's tree data are from an actual timber inventory. The stand's shape and the arrangement of the disease centers are contrived to il lustrate points in the sampling and model simulation process. In figure 1, the general outline of stand 20257 is an irregular polygon (approximating a rectangle). Within this polygon are 10 root disease centers. The 10 lightly shaded circles represent reduced stand density in a root disease center. A series of seven smaller circles, connected by a line, represent the timber inventory plots. Note that two of the seven plots fall into root disease centers. The stand's size is 40 acres.
In simulating the stand, the Western Root Disease Model uses the timber inventory plot data. (assume that aerial photos of the stand show that all 10 root disease centers were found and their combined area estimated.) These starting conditions were then supplied to the model. Figure 2 represents the model's view of the stand. The model assumes a square stand of equal area. The model will, by default, assign these 10 centers as circles of equal size located randomly unless location and size are supplied for each.
Stand projections with and without considering root disease lead to very different expectations in merchant able cubic volume for the stand over the next 150 years (fig. The root disease model, like most pest models.
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