ES Ch 2 Summary Reading

What was the main goal of the controlled experiment conducted by Bormann and Likens?

• To compare the loss of water and soil nutrients from an uncut forest with a deforested area

• To measure the growth rate of trees in different environments

• To analyze the impact of herbicides on plant regrowth

• To study the biodiversity of the Hubbard Brook Experimental Forest

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

What was the role of the V-shaped concrete dams in the experiment?

• To measure the volume and nutrient content of surface water leaving the valleys

• To prevent water from leaving the experimental site

• To store water for the forest

• To create a barrier for wildlife

Tags

NGSS.MS-ESS2-4

What was the percentage increase in water outflow from the deforested valley?

• 30-40%

• 10-20%

• 50-60%

• 70-80%

What was sprayed on the experimental site to prevent regrowth of vegetation?

• Herbicides

• Fertilizers

• Pesticides

• Water

How much greater was the loss of key soil nutrients in the experimental forest compared to the control forest?

• Six to eight times greater

• Two to three times greater

• Ten to twelve times greater

• Equal

Tags

NGSS.MS-LS2-3

In what year did the loss of calcium from the experimental site begin a sharp increase?

• 1963

• 1965

• 1968

• 1971

What type of feedback loop most likely caused the sharp increase?

• Positive

• Negative

Tags

NGSS.HS-LS4-5

In what year did calcium losses peak?

• 1963

• 1967

• 1971

• 1975

Why might calcium losses have reached a peak?

(Why did the soil stop losing calcium?)

• All or most of the calcium may have been washed away

• Rain in the area increased.

In what year were the calcium losses from the two sites closest together?

• 1961

• 1964

• 1968

• 1973