quiz 6 Ch 19 Flashcards Preview

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Flashcards in quiz 6 Ch 19 Deck (20)
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1
Q

energy goes __ through an ecosystem

A

one way

2
Q

energy is lost as

A

heat

3
Q

nutrients move in

A

cycles

4
Q

nutrient cycling

A

use, transformation, movement, and reuse of nutrient in ecosystem

5
Q

most phosphorous comes from

A

mineral deposits and marine sediments released from weathering

6
Q

rate of decomposition

A

nutrient made available to primary producers

7
Q

decomposition are determined by

A

rate of mineralization

8
Q

mineralization

A

organic molecule converted to inorganic

9
Q

decomposition influences

A

temperature.
moisture.
chemical composition of organism.

10
Q

factors for faster decomposition

A

higher temp.
greater moisture.
less lignin and more N content.

11
Q

litter bag experiments

A

take air dried leaves and placed in bag with mesh small enough to not lose leaf but large enough to allow air and invertebrates in

12
Q

evapotranspiration

A

effect of climate on terrestrial primary production due to temp and precipitation

13
Q

leaf mass loss in tropical forest and temperate forest

A

more mass loss in tropical forest compared to temperate

14
Q

toughness and N content effect on mass loss

A

tougher leaves with low N content decompose slower than soft leaves with high N content

15
Q

lignin effects of decomposition

A

inhibits fungi colonization of leaves so they decompose at slower rates

16
Q

effect of nitrogen on decomposition

A

lower concentrations of nitrogen have a lower decomposition rate

17
Q

nutrients in streams are transported

A

downstreams

don’t allow nutrient cyclin in place

18
Q

nutrient spiraling

A

stream nutrient dynamics to better represent stream nutrient dynamics with help of micro invertebrates

19
Q

pocket gopher contribution to nutrient cycling

A

bring N poor soil to surface.

allow greater horizontal heterogeneity in N availability and light penetration

20
Q

prairie dog colonies

A

feeding activities reduce above ground biomass. leave young grass with a higher N content.