quiz 6 Ch 19 Flashcards
energy goes __ through an ecosystem
one way
energy is lost as
heat
nutrients move in
cycles
nutrient cycling
use, transformation, movement, and reuse of nutrient in ecosystem
most phosphorous comes from
mineral deposits and marine sediments released from weathering
rate of decomposition
nutrient made available to primary producers
decomposition are determined by
rate of mineralization
mineralization
organic molecule converted to inorganic
decomposition influences
temperature.
moisture.
chemical composition of organism.
factors for faster decomposition
higher temp.
greater moisture.
less lignin and more N content.
litter bag experiments
take air dried leaves and placed in bag with mesh small enough to not lose leaf but large enough to allow air and invertebrates in
evapotranspiration
effect of climate on terrestrial primary production due to temp and precipitation
leaf mass loss in tropical forest and temperate forest
more mass loss in tropical forest compared to temperate
toughness and N content effect on mass loss
tougher leaves with low N content decompose slower than soft leaves with high N content
lignin effects of decomposition
inhibits fungi colonization of leaves so they decompose at slower rates
effect of nitrogen on decomposition
lower concentrations of nitrogen have a lower decomposition rate
nutrients in streams are transported
downstreams
don’t allow nutrient cyclin in place
nutrient spiraling
stream nutrient dynamics to better represent stream nutrient dynamics with help of micro invertebrates
pocket gopher contribution to nutrient cycling
bring N poor soil to surface.
allow greater horizontal heterogeneity in N availability and light penetration
prairie dog colonies
feeding activities reduce above ground biomass. leave young grass with a higher N content.
