Question

Concerning the impact of gaseous losses of nitrogen, which statement(s) is/are accurate?

1. Gaseous losses of nitrogen can influence the chemical properties of the atmosphere.
2. These losses contribute to air pollution.
3. They mitigate the greenhouse effect.

• A. ii only
• B. i, ii
• C. i only
• D. All

Answer 1

Answer:

B. i, ii

• Nutrients are lost from ecosystems by leaching, tracegas emission, wind and water erosion, fire, and the removal of materials in harvest.

• Most of the nitrogen and phosphorus required for plant growth in unmanaged ecosystems is supplied by the decomposition of plant litter and soil organic matter.

• Gaseous losses of nitrogen influence the chemical and radiative properties of the atmosphere, causing air pollution and enhancing the green-house effect.

• The combustion of fossil fuels has released large quantities of nitrogen and sulfur oxides to the atmosphere and increased their inputs to eco-systems.