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Title 190-Forestry Inventory Methods Technical Note <br />❑m® Example Stand -Level Diameter Distribution Table Using 2-Inch Size Classes Between <br />10 and 18 Inches DBH <br />❑ <br />❑m1911 <br />❑Ctl= <br />❑ ❑IE r❑111CIrE11❑ <br />DBH <br />TPA <br />BA <br />TPA <br />BA <br />TPA <br />BA <br />10 <br />12 <br />7 <br />6 <br />3 <br />12 <br />7 <br />12 <br />13 <br />10 <br />4 <br />3 <br />8 <br />7 <br />14 <br />16 <br />16 <br />0 <br />0 <br />0 <br />0 <br />16 <br />7 <br />10 <br />0 <br />0 <br />0 <br />0 <br />18 <br />0 <br />0 <br />0 <br />0 <br />0 <br />0 <br />❑EI= <br />3❑ <br />Z7 <br />• Tree Regeneration Sampling in Conjunction With Point Sampling <br />o To obtain a complete stand description, consider collecting nested fixed -radius plots <br />for trees in the seedling, sapling, or pole size at the same time as conducting point <br />sampling of the stand overstory. A fixed -radius plot with the same plot center as the <br />point sample can yield useful information for either a forest management plan or a <br />conservation practice job sheet. Plot size is dependent on tree density. <br />o Choose a plot size that will capture stocking without having to count more trees than <br />necessary; a cursory walk through the stand will help determine an appropriate plot <br />size. If tree density appears low enough that a 1/300th acre plot will often be empty, <br />where a 1/100th acre plot will capture regeneration, then utilize the larger plot. <br />Conversely, when surveying an extremely dense stand, the smaller plot is better to <br />avoid missing stems. As with the BA factor, keep the same plot size for the entire <br />stand to make expansion calculations easier. <br />o Calculating Regeneration TPA <br />Using the example tally sheet in figure 6, the fixed area plots are 1/100th acre in <br />size (11.8 feet). <br />There were 11 trees tallied in the 8-inch diameter class and smaller. So, <br />TPA = 11 counted trees X 100 / 3 = 366 trees per acre <br />o Again, a diameter distribution table is very useful to help target treatment options <br />(table 3). <br />❑m®3: Example Stand -Level Conifer Regeneration Table Showing Number of Trees in <br />Seedling, Sapling, and Pole Size Classes <br />❑❑❑❑ <br />❑mire❑ <br />11EI=E1=11Om <br />❑ EIH:k❑111 [ArIL❑ <br />❑EEEM <br />0-1 <br />167 <br />0 <br />0 <br />167 <br />2-3 <br />0 <br />0 <br />0 <br />0 <br />4-5 <br />0 <br />0 <br />0 <br />0 <br />6-7 <br />0 <br />66 <br />33 <br />99 <br />8-9 <br />0 <br />100 <br />0 <br />100 <br />❑ <br />33❑ <br />3=❑❑❑ <br />Note that in different geographic areas and forest types, size classes are defined differently, so <br />that some of the DBH classes shown in this table would be part of overstory tallies. <br />(Technical Note No. 190-FOR-01, Jul 2018) <br />11 <br />