NREA 2 sem 2 quiz Q's

Which sampling method can result in low accuracy of population estimates if there is some periodic (or cyclical) variation in the population that you're studying?

1. full census

2. simple random

3. systematic

4. stratified random

3. systematic

Which sampling method takes into consideration prior knowledge about the population that you're studying?

1. simple random

2. systematic

3. stratified

3. stratified

See the chart (scroll up/down/sideways if needed to see all of it; zoom in if you have to). You have a stand with 125 trees per acre and basal area of 115 square feet per acre. What is the percent stocking? Only enter as a whole number and without the percent sign

93

Match which sampling method should be used in which situation.

___if you will be carrying out a scientific research study that you will then try to published in a refereed journal, you should use

___if you have a large stand and you want to study the forest dynamics over time (tree growth, survival, mortality, whether seedlings survive best near or further from the mature trees of their species, relative spatial distribution of trees from different species, etc.), you should use

___if you will be carrying out a forest inventory in one forest stand as a consulting forester, you should use

___if you will be inventorying the Jericho School Forest, which is divided into multiple stands, you should use

1. simple random sampling

2. systematic sampling

3. stratified sampling

4. full census

1, 4, 2, 3

See the chart (scroll up/down/sideways if needed to see all of it; zoom in if you have to). You have a stand with 125 trees per acre and basal area of 115 square feet per acre. Using the chart, determine the quadratic mean diameter. Only enter as a number, to the nearest tenth; don't enter the units, which we know are inches.

13

Calculate the quadratic mean diameter, QMD, in inches to the nearest 10th of an inch, if your Basal Area per acre is 180 square feet per acre and you have 65 trees per acre.

22.5

You inventoried a variable radius plot using a prism with a basal area factor (BAF) of 20. You had just two trees on the plot and their diameters were 3.1 inches and 8.4 inches, respectively. How many trees per acre do you have? (whole number)

434

You inventoried a plot with a radius of 36 ft and the trees on the plot have a combined (total) basal area of 10 square feet. What is the basal area per acre (in the usual units of square feet per acre)? (provide answer as a whole number)

107

Calculate the Importance Value Percent (IVP) for white pine from the data in the table below. Provide answer a whole number from 0 to 100, and no units (we know it's in percent)

Species Trees per acre Basal area (ft²/ac)

Red maple 30 45

White ash 50 35

White pine 20 55

30

You inventoried a plot with a radius of 30 ft and you had 9 trees on it. How many trees per acre do you have? (whole number)

139

See the table below. Reminder that MBF stands for Thousand Board Feet. Calculate the 10-year Periodic Annual Increment for age 34. Give the answer as just the number (no units, we know it is MBF/ac) and precision of two digits after the decimal.

stand age	merch vol (MBF/ac)
20	6.10
21	6.90
22	7.70
23	8.50
24	9.40
25	10.40
26	11.30
27	12.10
28	12.90
29	13.60
30	14.20
31	14.80
32	15.50
33	16.40
34	17.10
35	17.90
36	18.60

0.77

You are using a prism or an angle gauge with a Basal Area Factor (BAF) of 10. You counted 3 tree as being IN. What is your basal area per acre? Provide answer as a whole number.

30

See the table below. Reminder that MBF stands for Thousand Board Feet. Calculate the Current Annual Increment for age 31. Give the answer as just the number (no units, we know it is MBF/ac) and precision of two digits after the decimal. 

stand age	merch vol (MBF/ac)
20	6.10
21	6.90
22	7.70
23	8.50
24	9.40
25	10.40
26	11.30
27	12.10
28	12.90
29	13.60
30	14.20
31	14.80
32	15.50
33	16.40
34	17.10
35	17.90
36	18.60

0.60

Calculate tree height if the reading on the clinometer at the base of the tree is -4%, the reading at the top of the tree is 66%, and you are 100 ft away from the tree. Answer to be a whole number, no decimals, spaces, units, etc.

70

See the table below. Reminder that MBF stands for Thousand Board Feet. Calculate the Mean Annual Increment for age 26. Give the answer as just the number (no units, we know it is MBF/ac) and precision of two digits after the decimal. 

stand age	merch vol (MBF/ac)
20	6.10
21	6.90
22	7.70
23	8.50
24	9.40
25	10.40
26	11.30
27	12.10
28	12.90
29	13.60
30	14.20
31	14.80
32	15.50
33	16.40
34	17.10
35	17.90
36	18.60

0.43

See the table below. Reminder that MBF stands for Thousand Board Feet. Calculate the 5-year Periodic Annual Increment for age 32. Give the answer as just the number (no units, we know it is MBF/ac) and precision of two digits after the decimal. 

stand age	merch vol (MBF/ac)
20	6.10
21	6.90
22	7.70
23	8.50
24	9.40
25	10.40
26	11.30
27	12.10
28	12.90
29	13.60
30	14.20
31	14.80
32	15.50
33	16.40
34	17.10
35	17.90
36	18.60

0.68

Calculate the quadratic mean diameter, QMD, in inches to the nearest 10th of an inch, if your Basal Area per acre is 120 square feet per acre and you have 45 trees per acre. 

22.1

You calculated Shannon's diversity index for a forest and it was 1.5. There were 15 tree species in the forest. Calculate Pielou's evenness to the nearest hundredth (i.e., two digits after the decimal point)

0.55

See the table below. Reminder that MBF stands for Thousand Board Feet. Calculate the Mean Annual Increment for age 30. Give the answer as just the number (no units, we know it is MBF/ac) and precision of two digits after the decimal. 

stand age	merch vol (MBF/ac)
20	6.10
21	6.90
22	7.70
23	8.50
24	9.40
25	10.40
26	11.30
27	12.10
28	12.90
29	13.60
30	14.20
31	14.80
32	15.50
33	16.40
34	17.10
35	17.90
36	18.60

0.47

Select all that apply. What are the sources of green house gas emissions in a forest:

1. respiration

2. burning

3. decomposition

4. photosynthesis

1, 2, 3

Several forests are the same age, species, and site index. Which forest contains more carbon:

1. the forest that has not been thinned

2. the forest that has been thinned once, where the trees are larger, on average, than the trees in the unthinned forest

3. the forest that has been thinned several times, where the trees are therefore the largest in diameter and volume than the trees in the other two forests

1. the forest that has not been thinned

See the table below. Reminder that MBF stands for Thousand Board Feet. Calculate the 10-year Periodic Annual Increment for age 31. Give the answer as just the number (no units, we know it is MBF/ac) and precision of two digits after the decimal.

stand age	merch vol (MBF/ac)
20	6.10
21	6.90
22	7.70
23	8.50
24	9.40
25	10.40
26	11.30
27	12.10
28	12.90
29	13.60
30	14.20
31	14.80
32	15.50
33	16.40
34	17.10
35	17.90
36	18.60

0.79