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25 Cards in this Set
- Front
- Back
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productivity |
the conver-ion of energy into biomass over a certain period of time
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productivity unit |
per unit area per unit time, eg per metre squared per year
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gross |
total amount of something made as a result of an activity |
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net |
the amount left after desicions are made |
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primary/secondary |
plants/animals |
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biomass |
the living mass of an organism, sometimes dry |
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gross productivity |
total gain in energy or biomass per unit area per unit time |
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net productivity |
the gain in energy or biomass per unit area per unit time that remains after deductions due to respiration |
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gross primary productivity |
total gain in energy or biomass per unit area per unit time by green plants |
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net primary productivity |
total gain in energy or biomass per unit area per unit time by green plants after allowing for losses due to respiration |
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NPP equation |
npp = GPP - R where R = respiratory loss |
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Gross secondary productivity |
GSP = food eaten - fecal loss in heterotrophs |
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net secondary productivity |
GSP - Respiratory losses |
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biogeochemical cycles |
when |
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the carbon cycle |
just like, do it |
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carbon fixation |
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nitrogen cycle |
storages: organisms, soil, fossil fuels, the atmosphere, in water flows: nitrocen fixation, nitrification, denitrification, feeding, absorption, assimilation, consumption, execretion, death decomposition |
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nitrogen fixation |
atmospheric nitrogen is made available to plants, fixing to bacteria in soil, in roots, in water, lightning, |
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nitrification |
convert ammonium to nitrites or nitrites to nitrates |
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denitirification |
reversed convertation |
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assimilation |
organisms building nitrogen into more complex molecules |
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Efficiency of assimilation |
(gross productivity * 100) : food eaten |
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efficiency of biomass productivity |
(net productivity * 100) : gross productivity |
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energy budget |
quantities of energy entering, staying, and leaving the animal population |
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maximum sustainable yield |
the largest crop or catch that can be taken from the stock of a species without depleting the species |
