lecture 25 Flashcards

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1
Q

ecosystem function

A

the interaction that occurs within an ecosystem that affects the rate of input or output of energy and matter

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2
Q

net primary production npp

A

rate of which community makes primary producer biomass; measure of flow of materials and energy into the biotic component of the ecosystem

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3
Q

gross primary production gpp

A

rate at which primary producers capture energy from the sun and convert it into chemical energy

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4
Q

what is the gpp equation

A

npp+Rp (plant respiration)

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5
Q

what percentage of npp is equivalent to gpp

A

50%

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6
Q

terrestrial npp

A

increases in the equator but decreases in colder dryer (deserts) areas

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7
Q

npp varies with

A

temp and precipitation; more sun good but moderate rain because too little cant photosynthesize and too much makes cells fat

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8
Q

marine npp is highest where and why

A

near coastlines due to getting constant nutrients

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9
Q

how much of npp is the ocean responsible for

A

46%

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10
Q

earth is what kind of system in terms of energy

A

open system since we conserve energy and lose it and gain it back

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11
Q

earth is what kind of system in terms of matter

A

closed system because we dont get nutrients from outside the plant

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12
Q

pool/reservoir

A

amount of material contained within each compartment (boxes)

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13
Q

flux

A

rate at which materials enters and leaves compartments (arrows)

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14
Q

boxes will stay the same size if

A

the fluxes into the pool are equal to the fluxes going out

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15
Q

what are the three essential materials for ecosystems

A

water nitrogen and carbon

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16
Q

water is responsible for the movement of what

A

the physical movement of materials and has heat capacity

17
Q

what is the biggest pool in the water cycle

A

ocean

18
Q

what is the biggest flux

A

evaporation (sea)

19
Q

what flux exceeds evaporation over land

A

precipitation

20
Q

human effects on global water cycle

A

removing vegetation dries ecosystems, pumping depletes fossil water and warming climate is causing sea rise, INCREASE RUN OFF AND DECREASED PRECIPITATION

21
Q

what is floridas primary water use

A

ground water

22
Q

rising sea levels causes what to aquafers

A

salt water intrusion

23
Q

what percent of water is used indoors

A

70%

24
Q

what is stats on lack to safe water

A

1 in 9 lack access to safe water

25
Q

what is stats on lack to a toilet

A

1 in 3 lack access to a toilet

26
Q

what is stats on death by water related disease

A

every 2 mins a child dies from a h20 related disease

27
Q

denitrification

A

nitrogen going back into atmosphere

28
Q

fixation

A

changing chemical comp of nitrogen to make it usable

29
Q

where do plants get nitrogen

A

soil and dead things

30
Q

how have humans contributed to the nitrogen cycle

A

we have livestock, and factories, an fossil fuel burning