The Hubbard Brook watershed experiment demonstrated that A) following a disturba

Question

The Hubbard Brook watershed experiment demonstrated that

A) following a disturbance such as clearcutting, nitrate concentrations in stream water increased by 40 to 50 times that in an undisturbed forest

B) following a disturbance such as clearcutting, phosphate concentrations in stream water increased by 500%

C) following a disturbance such as clearcutting, denitrification rates were 10 times greater than in an undisturbed forest

D) following a disturbance such as clearcutting, populations of mycorrhizal fungi were 50 times smaller than those in undisturbed forest

E) following a disturbance such as clearcutting, nitrogen fixation rates were 1/10th as great as in an undisturbed forest

Explanation / Answer

the answer is A: Following a disturbance such as clearcutting, nitrate concentrations in stream water increased by 40 to 50 times that in an undisturbed forest.

In watershed 2: The annual average nitrate concentration in streamwater increased from <1 mg/L to >50 mg/L with 2 years.

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