Question

the phosphorus cycle

1. what are the major reservoirs of the phosphorus cycle?
2. what are the limitations of the phosphorus cycle?
3. how can humans positively impact the phosphorus cycle?
4. how do humans negatively impact the phosphorus cycle?

Explanation:

1. The major reservoirs in the phosphorus cycle are rocks (where phosphorus is initially stored), underground phosphate reserves, and underwater phosphate reserves. These store large - amounts of phosphorus and release it slowly into the cycle through processes like weathering and leaching.
2. Limitations include its slow rate as it is a sedimentary cycle with long - term geological processes involved. Also, it is a non - gaseous cycle, so it doesn't cycle through the atmosphere easily, limiting its distribution in some ways.
3. Humans can positively impact the cycle by using phosphate fertilizers more efficiently, reducing runoff, and recycling phosphorus from waste products like sewage and agricultural residues.
4. Humans negatively impact the cycle by excessive use of phosphate fertilizers leading to runoff into water bodies, causing eutrophication. Deforestation can also increase soil erosion, releasing more phosphorus into water systems in an unregulated way.

Answer:

1. Rocks, underground phosphate reserves, underwater phosphate reserves
2. Slow rate due to geological processes, non - gaseous nature limiting atmospheric cycling
3. Efficient fertilizer use, reducing runoff, recycling phosphorus from waste
4. Excessive fertilizer runoff causing eutrophication, deforestation increasing soil erosion and unregulated phosphorus release