Figure 2.5 Loss of nitrate ions (NO3?) from a deforested watershed in the Hubbard Brook Experimental Forest(Core Case Study, Figure 2.1, p. 30).
?
With reference to the accompanying figure, explain the significant difference that occurred between 1966 and 1970 in terms of the two lines representing the control watershed and the experimental watershed.
What will be an ideal response?
The line labeled "Disturbed (experimental) watershed" represents the level of loss of nitrates following the removal of vegetation in the experimental watershed. Without vegetation the soil rapidly lost the nitrates to rainfall until they were substantially gone.
You might also like to view...
The practice of suspending rust particles in contaminated water, and then drawing out the rust with hand-held magnets, has been effective in dealing with
a. DDT contaminated water b. arsenic contaminated water c. oil contaminated water d. heavy metal contaminated water e. acidified water secondary to acid rain
Which of the following explains why advection fog is more likely to form at headlands than at beaches along an irregular coastline?
A. the occurrence of converging surface winds and rising air B. the occurrence of diverging surface winds and sinking air C. the occurrence of converging surface winds and sinking air D. the occurrence of diverging surface winds and rising air
A cirque basin may serve as an accumulation zone for alpine glaciers. Using contour lines on the mountains and on the glaciers, how many ice-filled cirques (scooped out amphitheater-like basins) do you identify on the map? What is the elevation of the highest glacial ice surface on the map?
What will be an ideal response?
According to Figure 14.5, a major difference between the B horizons of forest soil and desert soil is
A) desert soil is enriched in calcite when compared to the parent material. B) forest soil is enriched in calcite when compared to the parent material. C) desert soil is depleted in clay minerals when compared to the parent material. D) forest soil is depleted in clay minerals when compared to the parent material.