Phosphorous Cycle

Question 1

Major Source of Phosphorous

Answer 1

rocks/sediment –> erosion

Question 2

Most Mobile form of Phosphorous

Answer 2

PO4- but that still depends on the environment (phosphorous in general is not super mobile)

Question 3

Limiting Nutrient in Freshwater Ecosystems

Answer 3

Phosphorous (Sometimes nitrogen)

Question 4

Soluable Reactive Phosphorous (SRP)

Answer 4

PO4 and reactive DOP

Question 5

Total Phosphorous

Answer 5

Dissolved + Particulate Phosphorous

Question 6

When are there low concentrations of avaliable phosphorous?

Answer 6

Summer

Question 7

Inorganic inputs of Phosphorous

Answer 7

Erosion, dust, humans (fertilizer and sewage)

Question 8

Organic inputs of Phosphorous

Answer 8

stream transport

Question 9

Do anoxic or oxic areas of the lake have more phosphorous normally?

Answer 9

anoxic

Question 10

Phosphorous cycle in oxic environment

Answer 10

Fe2+ oxidized to Fe3+ –> Fe3+ binds with PO4 to form FePO4

Question 11

Phosphorous cycle in anoxic environment

Answer 11

FePO4 dissolved to Fe3+ and PO4