This window is reached from the Edit Episodic Events Window by clicking on the "Natural Disturbance" tab and selecting "New" or "Edit".
This window is where you create a new natural disturbance event or edit an existing one. Along the left portion of the window, you enter data about the natural disturbance. On the map in the center, you select the area of the plot to which to apply your natural disturbance. If a tree map has been entered, those trees are displayed on the map and the species key is to the right. (For more on tree maps and disturbance events, see the Edit Silviculture and Disturbance Window topic.)
In this document:Timestep. Enter the timestep in which you wish the natural disturbance to occur. You can create more than one natural disturbance per timestep.
Species applied to. Put a checkbox next to each species to which this natural disturbance is to apply. If a species is not checked, no trees of that species will be killed. You can kill trees of the same species more than once in a timestep, but if the areas of the two natural disturbances overlap, there is no attempt to consolidate them and you may not get the results you expect.
Amount of disturbance type. Enter how you intend to specify the amount of trees to kill in each size class to which the disturbance applies. The same amount type applies to all size classes.
Diameter Range(s) to kill. Enter the size class ranges you are killing. You must enter at least one. For each size class, enter the minimum and maximum DBH, and the amount to kill in that range. The units of amount to kill will depend on what you have entered in "Amount of disturbance type". Kill ranges may not overlap.
To specify the plot area to which to apply the natural disturbance, select the appropriate cells on the map. Cells are each 8 meters by 8 meters. Selected cells will show up in color, and unselected cells will be white. You can click and drag to mark out an area, or click on individual cells. Clicking or dragging on selected (colored) cells causes them to become unselected (white).
07-Jun-2004 01:54 PM