lecture 20 - ecosystem energy flow Flashcards
energy ______ through ecosystem while chemicals ______
flow; cycle
can energy be lost
yes as heat
sun is what type of energy and heat lost to environment is what type of energy
sun = high energy
heat lost to environment = low-form energy
photoautotrophs convert
CO2 into organic moleqs
how do heterotrophs return CO2 to environment
by performing cellular respiration
what does photosynthtesis by plants remove
substantial amounts of atmospheric CO2 each year is about equal to CO2 added to atmosphere through celluluar respiration by producers and consumers
carbon can be sequestered in forms that are not readily…
bioavailable
burning of fossil fuels and wood is…
non biotic way in which CO2 is contributed to atmospher; volcanos contribute too
is nitrogen biologically available
no, but N2 is abundant
what forms of nitrogen are biologically useful as nutrients for microbes and plants
ammonium, nitrate, and nitrite
waht forms of N can animals take up
organic forms (ie amino acids)
nitrogen conversions are mediated by what
microbe metabolism
available ______ is often a limiting resource
nitrogen
what has increased total nitrogen
industrial production of N fertilzers
what are the main limiting micornutrients
-nitrogen (nitrite, nitrate, amminium)
-phosphate
-iron
-calcium
-potassium
