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Flashcards in Exam 2 Deck (19)
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1
Q

GPP

A

Gross primary productivity

NPP+r

2
Q

NEP

A

Net Ecosystem Productivity
GPP- r(plants)-r(consumers)-r(decomposers)

Tells whether a forest is a carbon source or sink

3
Q

What’s more productive a tropical rain forest a a temperate forest or the open ocean? Tropical versus woodlands and grasslands?

A

Tropical rain forest is 50% more productive than a temperate forest but not as productive as the open ocean.

3-5x as productive as woodlands and grasslands

4
Q

How much of the GPP of a rainforest is respirated?

A

50-60%

5
Q

Terrestrial ecosystem model

A

Uses five components

  • carbon in veg
  • carbon in soils and detritus
  • N in veg
  • N in soils and detritus
  • available inorganic soil N

Other variables

  • temp
  • cloudiness
  • elevation
  • precip
  • soil texture
  • veg type
6
Q

What is a carbon sink?

A

More sequestration less respiration

7
Q

Leaf area index (LAI)

A

The lead area above a square meter of forest floor.

High in the tropics

8
Q

Water use efficiency

A

Ratio of water used in plant metabolism to water lost via transpiration

9
Q

Diffuse radiation (solar dimming)

A

Increased light use efficiency due to increasing fraction of diffuse light (dust, aerosols)

May reduce c losses via photorespiration (temp stress)

Wet tropics benefit greatly

10
Q

Disturbance recovery hypothesis

A

Lighter wooded species decline and heavier wooded species increases proportionately with succession

11
Q

Resource availability hypothesis

A

No relationship between C stocks and wood density

12
Q

Effects of deforestation on climate

A

Temperature increase in the tropics by 2 Celsius and drier air above tropics and drought in northwest America

13
Q

Increased temp effects

A

Higher tree mortality

14
Q

Theory of island biogeography

A

With time areas or islands will attain dynamic equilibrium

15
Q

How is Chagas’ disease being effected by fragmentation

A

Lives in palm oil trees

More palms =more bugs that are infected = more people with the disease

16
Q

How is soil formed?

A
P-parent material
C-climate
O-organisms
R-topography
T-time
17
Q

Role of n and p in tropical soils

A

N is limiting in temperate and high latitude

P is limiting in lowland tropics
N constrains growth due to high P in montane tropical forests

18
Q

Grazing and fire on North American vs South African Savannah

A

SA has more history with fire and grazing also larger herbivores affecting the grassland in different ways than that of a NA grassland

19
Q

NPP

A

Net primary productivity

GPP-r(plants)