Edit Harvest Window

This window is reached from the Edit Episodic Events Window by clicking on the "Harvest" tab and selecting "New" or "Edit".

This window is where you create a new harvest event or edit an existing one. Along the left portion of the window, you enter data about the harvest. On the map in the center, you select the area of the plot to which to apply your harvest. 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 episodic events, see the Edit Episodic Events Window topic.)

Timestep. Enter the timestep in which you wish the harvest to occur. You can create more than one harvest per timestep.

Species applied to. Put a checkbox next to each species to which this harvest is to apply. If a species is not checked, no trees of that species will be cut. You can cut the same species more than once in a timestep, but if the cut areas of the two harvests overlap, there is no attempt to consolidate them and you may not get the results you expect.

Cut type. Select the type of cut you are performing. The cut type makes no difference to the way that trees are selected for harvest. Its main effect is to change the substrate composition of the plot. If you want to select multiple size classes for cutting, select "Partial cut".

Cut amount type. This only applies if you have selected "Partial cut" under "Cut type". Enter how you intend to specify the amount to cut in each size class you want to cut. The same cut amount type applies to all size classes.

• % of density. You intend to specify cut amounts as a percentage of total density to remove, from 0 to 100. The trees removed will be randomly distributed between the minimum and maximum diameters in the size class. For small tree populations, the amount actually removed may not be exactly what was entered.
• Amt. density (#/ha). You intend to specify cut amounts as a number of trees per hectare to remove. SORTIE will calculate the actual number of trees to remove by multiplying this number by the area to which the harvest is applied. The trees are removed in size order, starting with the tallest in the size class, until the target number has been reached or there are no more trees in that size class.
• % of basal area. You intend to specify cut amounts as a percentage of total basal area to remove, from 0 to 100. SORTIE will add up the basal area in the size class in the cut area and take the percentage in order to figure out how much to cut. SORTIE will work its way down the trees in the cut area in size order, removing each one that brings the amount of basal area removed closer to the target amount without going over. If the size class range and the cut area are both large, the amount of basal area removed is likely to be very close to the target.
• Amt. basal area (m²/ha). You intend to specify cut amounts as an amount of basal area to remove, in square meters per hectare. SORTIE will calculate the actual amount of basal area to remove by multiplying the cut amount by the area to which the harvest is applied. SORTIE will work its way down the trees in the cut area in size order, removing each one that brings the amount of basal area removed closer to the target amount without going over. If the size class range and the cut area are both large, the amount of basal area removed is likely to be very close to the target.

Diameter Range(s) to cut. Enter the size class ranges you are cutting. You must enter at least one, but in order to enter more than one, you must specify "Partial cut" under "Cut type". For each size class, enter the minimum and maximum DBH, and the amount to cut in that range. The units of amount to cut will depend on what you have entered in "Cut amount type". Cut ranges may not overlap.

To specify the plot area to which to apply the harvest, 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).