C = volume harvested over growth period

Is this an estimate of gross or net growth? Explain.

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4.2 An inventory plot was measured at 10-year intervals and the following measurements taken

Tree volume in cubic feet.
Tree	First inventory	Second inventory	Comment
1	21	41
2	42	53
3	27	38
4		19	In-growth
5	97		Tree died
6	86		Tree cut
7		24	In-growth

Calculate the following for the plot

(a) Gross increment including in-growth

(b) Gross increment of initial volume

(c) Net increment including in-growth

(d) Net increment of initial volume

(e) Net increase in growing stock

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4.3 Fill in the missing entries in this even-aged growth analysis table (units in cubic feet).

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4.4 Give a convincing verbal and/or mathematical argument why either periodic annual increment always equals mean annual increment at the age when mean annual increment is at its maximum value, or, why it does not.

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4.5 Give some biological reasons why there would be fewer trees per acre at a given age for better quality sites, as shown in figure 4.8

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4.6 Review the definition of sustainability for uneven-aged structures [equation(4.7)].

(a) Discuss the biological assumption about how trees regenerate and grow that are required to support a conclusion that any specified residual stand structure, including negative exponential structures, is sustainable. Consider aspects of tree tolerance in your answer.

(b) How would you articulate such a sustainability constraint for snags, deer feeding habitat, or stand tree canopy structure? Define some specific attributes to characterize these outcomes and conditions that could be monitored in future inventories. Then state some rules based on these attributes to guide an assessment of whether or not they are being sustained.

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4.7 Consider three additional ecological outcomes: spotted owl nesting habitat, per acre carbon dioxide to oxygen conversion, and annual yield per acre of merchantable mushrooms. For each, (a) define the quantifiable attributes you would use to measure the amount or kind of outcome, and (b) describe the kinds of data, research, and inventory data that would be needed to quantify your attributes and enter the results as additional rows in table 4.2

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4.8 Three trees were measured on each of three plots in order to estimate the site index of a ponderosa pine stand for growth and yield estimation purposes. Estimate the site index of this stand using the curves for ponderosa pine in figure 4.11.

None of the trees showed any signs of early suppression and all appeared to be the most competitive dominant trees in the plot.