main reserve of phosphorus exists in
the earth's crust
how is phosphorus cycled back into the soil?
1. weathering and erosion release phos. into the soil.
2. animals consume phosphorus and after they excrete it, it is decomposed back into the soil.
How do plants acquire their phos?
absorb ionized forms of it (phosphate)
Herbivores get their phosphorus by_____.
from eating plants
relationship b/w primary production and total phosphorus concentration.
as primary production of phosphorus inc, phos. concentration inc. too
main reserve of carbon exists in______.
rocks and fossil fuels
How is carbon cycled b/w atmosphere and organisms?
1. plants-absorb CO2 from atmosphere via photosynthesis releasing O2 into the atmosphere.
2. Organisms breath in O2 and breath out CO2 via respiration
gas, goal, and oil that form from decomposition of dead organisms
not readily available for use by most organisms
the process by which bacteria convert N2 (atmospheric nitrogen) into forms usable by other organisms (NH3 or NH4+)
bacteria convert NH3 or NH4+ to nitrate (NO3-) which can be used by plants
where inorganic substances are incorporated into organic molecules
-conversion of nutrients into usable forms
ex: organisms assimilate nitrogen by taking up NH3, NH4, and NO3- and incorporating them into other molecules
how do humans get nitrogen?
through eating foods with nitrogen
effects of deforestation on nutrient concentration
deforestation-causes nutrients levels to significantly increase
main phenomena responsible for the movement of water within the global ecosystem
evaporation and percipitation