lecture 25 Flashcards

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

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

24
Q

what is stats on lack to safe water

A

1 in 9 lack access to safe water

25
what is stats on lack to a toilet
1 in 3 lack access to a toilet
26
what is stats on death by water related disease
every 2 mins a child dies from a h20 related disease
27
denitrification
nitrogen going back into atmosphere
28
fixation
changing chemical comp of nitrogen to make it usable
29
where do plants get nitrogen
soil and dead things
30
how have humans contributed to the nitrogen cycle
we have livestock, and factories, an fossil fuel burning