Exam 23: Biogeochemical Cycles

Although nitrogen can act as a fertilizer initially,too much nitrogen added to a forest system can cause forest decline.

The main reservoir of plant-available phosphorus is organic matter in the soil.

Atmospheric carbon dioxide concentrations in a forest are greater during the day than during the night.

The two basic types of biogeochemical cycles are gaseous and ________.

Soil formation and soil characteristics have major influence on the processes of nutrient retention and release.

In aquatic ecosystems,the phosphorous cycle moves through three states: particulate organic phosphorous,dissolved organic phosphates,and ________ phosphates.

The difference between the rate of carbon uptake in photosynthesis and the rate of carbon loss due to autotrophic and heterotrophic respiration is the net ________ productivity.

Lightening converts N2 to a nitrogen form that enters soil and can be readily assimilated by plants.

Fire results in the production of ash from vegetation and soil organic matter.This ash contains nutrients that are most often

Biological nitrogen fixation is accomplished by

Carbon dioxide concentrations fluctuate in predictable seasonal patterns on the surface of the planet largely as a result of

Nearly all of the phosphorus in terrestrial ecosystems comes from the ________ of calcium phosphate minerals.

The main reservoirs of oxygen are water and ________.

Biological nitrogen fixation is accomplished by symbiotic ________ living in mutualistic association with plants.

The branch of chemistry dealing with the quantitative relationships of elements in combination is called ________.

The phosphorus cycle is a sedimentary cycle with essentially no gaseous cycle.

Without the cycling of water,biogeochemical cycles would cease.

The ability of the surface waters of the ocean to take up carbon dioxide is governed by the reaction of carbon dioxide with the ________ ion to form bicarbonates.

One way that sulfur enters the atmosphere is through volcanic activity.

Which of the two basic types of biogeochemical cycles is most likely to have global cycle patterns?