Ecosystem ecology Flashcards
1
Q
ecosystem
A
the organisms in a community and the physical enviorment .
2
Q
Nitrogen cycle:
A
- N2
- nitrogen transformations
- only a few microorgansims are able to convert N2 to N
3
Q
Human effect of nitrogen cycle:
A
- 60 percent of nitrogen gas leads to runoff
- eutrophication(enriched with minreals) caused by excess runoff pollution
4
Q
Phosphorus:
A
- primary source in from soil
5
Q
Human effect on phosphorus:
A
- mining for p leads to excess runoffs
- runoffs enters water sources leading to dead zones
6
Q
Carbon cycle:
A
- ## atmosphere and natural resvoir
7
Q
Humans effect on carbon cycle:
A
- Humans alter the carbon cycle by burning fossil fuels releasing carbon dioxide into the environment
- alter land use by removing natural sinks
8
Q
Short term cycling of carbon
A
- Photosynthesis
- Respiration
- Up and down graph
9
Q
Long term cycling of carbon
A
industrial revolution
10
Q
Examples of short term cycling carbon:
A
- the leaving and returning of leaves
- Release of carbon dioxide
- photosynthesis
11
Q
Reservior:
A
the places where
carbon is found on the Earth.
Rocks and sentiments
12
Q
Fluxes
A
the rates at which carbon fluxes from one reservior to another
13
Q
evidence that shows human effecting co2 levels
A
the ratio of 13c to 12c has declines
only organic matter formed by photosynthesis has the same ratio to account for the decline
14
Q
co2 sources (released)
A
-deforestation in and out the tropic
- fossil fuel
-
15
Q
co2 (stored)
A
- ocean
- land
- atomspheric CO2
