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Flashcards in Biogeochemical Cycles Deck (16)
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1

biogeochemical cycle

path an element takes as it moves from abiotic systems through producers, consumers & decomposers and back again

nutrient flow in biotic/abiotic factors

2

soil organic matter

organic (carbon containing) compounds found in soil

3

humus

decayed organic matter in soils

4

watershed

area drained by a single stream or river

5

global water cycle

estimated amount of water moving btwn major reservoirs over a course of a year, powered by sun

6

groundwater

water below land surface

7

aquifer

underground layer of soil saturated w/ water
- takes thousands of years to recharge
- contained/closed or uncontained/open

8

water table

upper limit of underground layer of soil saturated w/ water

9

global nitrogen table

movement of nitrogen among terrestrial ecosystem, oceans & atmospheres

10

nitrogen fixation

incorporation of atmospheric of N2 into NH3, which can be used to make many organic compounds
- occurs in a few lineages of bacteria & archaea

11

dead zone

anoxic

12

global carbon cycle

worldwide movement of carbon among terrestrial ecosystems, oceans & atmospheres

13

how lost nutrients can be replaced

(1) ions become rock weather
(2) blow in on soil particles OR dissolved in streams
(3) nitrogen-fixing bacteria conversions

14

biogeochemical cycle questions

(1) nature/size of storage reservoir
(2) movement patterns: speed & process
(3) interactions

15

contained/closed aquifer

nonporous rock layers overlie aquifer

16

uncontained/open aquifer

replenished water percolating down from surface