Unit 6: Chapter 20: Production

Question 1

Energy in an ecosystem originates with…

Answer 1

Primary producers

Question 2

Total ecosystem photosynthesis

Answer 2

Gross primary production (GPP)

Question 3

What percentage of the ground area does a leaf of Leaf Area Index (LAI) 0.6 cover?

Answer 3

60%

Question 4

What layer are the emergent trees at the top of a canopy?

Answer 4

Layer 1

Question 5

NPP = GPP - R meaning

Answer 5

Net primary production = Gross primary production - respiratory losses

Question 6

Plants allocate NPP to roots or shoots depending on requirements. What environments would warrant highest shoot and highest root allocation?

Answer 6

Tropical forest

Temperate grassland

Question 7

NPP is a measure of ecosystem health and influences…

Answer 7

Carbon cycle

Question 8

By remote sensing reflection ___ can be estimated on a global scale

Answer 8

NPP

Question 9

Direct measure of CO2

Answer 9

Net Ecosysem Exchange (NEE)

Question 10

Explain NEE = GPP - (AR + HR)

Answer 10

Net ecosystem exchange = Gross primary production - Auototrophic and heterotrophic respiration

Question 11

NPP is constrained by what types of factors?

Answer 11

Physical and biotic

Question 12

Global precipitation and Global temperature combo for high NPP

Answer 12

Moderate precipitation and high temperature

Question 13

T/F On graph of GPP and R GPP is higher atm but will switch on the future

Answer 13

True

Question 14

In aquatic ecosystems NPP is controlled primarily by…

Answer 14

Nutrient availability

Question 15

Still water ecosystems

- Low phosphorus/nitrogen limits NPP

Answer 15

Lentic

Question 16

Moving water ecosystems

- Usually limited by turbidity

Answer 16

Lotic

Question 17

NPP of these ecosystems usually limited by nitrogen

Answer 17

Ocean ecosystems

Question 18

Highest average NPP of aquatic environments

Answer 18

Estuaries