Upgrade to remove ads
Only $35.99/year

last quiz hon enviro lab

Terms in this set (48)

what is the primary source of energy for the earths ecosystems?
the sun
what are organisms called that are photosynthetic?
producers
the formation of carbon dioxide, water and sunlight is called what
primary production
the term production refers to the creation of what in photosynthesis?
biomass (mass or weight of a living organism)
another name for producers
autotrophs
like consumers the producers have the ability to what
respire
net primary production
the difference between the energy initially trapped by photosynthesis and the amount of energy remaining as plant biomass within the plant for itself
net primary production is the
biomass available to the consumers
gross primary production
the rate at which energy is captured during photosythesis
equation for npp
net primary production = gross primary production - respiration
photosynthesis occurs
in bright light
decomposition activity
as organic material decays, microbial processes consume oxygen
turbulence and wind at the air water interface
wave action, rapid aerate water and increase oxygen concentration
temperature of the water
as temp increases the ability to hold oxygen decreases
salinity
as water becomes more salty its ability to hold oxygen decreases
oxygen is one of the most easily measured products of both photosynthesis and respiration so measuring ___________ primary productivity
dissolved oxygen is a good way to gauge
oxygen within water droplets is known as
dissolved oxygen (DO)
when DO is low
water quality is bad
when DO is high
water quality is good
when BOD is high
water quality is bad
when BOD is low
water quality is good
our atmosphere contains
21% of oxygen
DO is measured by
mg/l or ppm (parts per million) or percent of saturation
at sea level DO percent range is
7.65mg/L - 14.62 mg/L
different organisms need
different amounts of DO to survive in water
things that can affect DO
temp, salinity, higher respiration, higher rates of photosynthesis, higher barometric pressure
the demand for oxygen by bacteria decomposing organic matter that use oxygen to metabolize
biochemical oxygen demand BOD
runoff of fertilizer is also problematic as the nutrients from the fertilizers
stimulate the growth of aquatic plants and photosynethic organisms
as aquatic plants and microorganisms die, aerobic bacteria consume oxygen while decomposing the dead organisms causing
DO to fall
erosion
is a type of land degradation that occurs when soil, rock, and other material are removed from the land surface
land development is the most common way
soil degradation, stormwater runoff and erosion occur
the increase of impervious surfaces results in more frequent and more instense
stormwater runoff
in agricultural settings sometimes land is left bare and in
furrows
a single farm field can loose __________ from a single runoff event
20 metric tons (2mm) of soil per hectare
soil regenerates around
1mm 11 metric tons per year
the use of cover crops and crop rotation dramatically reduces
soil erosion and stormwater runoff
USDA recommendations to farmers to prevent runoff
contour farming
avoid planting on steep slopes
wind breaks
grass- lined waterways
nutrients within soil particles
nitrates and phosphates
when water is filled with elevated nitrogen levels
results in blue baby syndrome and blue tongue disease in deer
when waters are enriched with phosphorous
the result is an increase in algal blooms, increase in BOD and decrease in DO
increasing pervious surfaces in cities would
decrease surface runoff, increase bioremediation, increase plants available in water and general cleansing of water before its reaches surface waters
bioremediation
The use of living organisms to detoxify and restore polluted and degraded ecosystems
the flow of energy can be studied by assessing the
energy requirements of a top predator within a food chain
in a typical food chain no more than
10% of high quality energy is transferred from one trophic level to another
this 10 percent rule is within accordance of
the second law of thermodynamics
a food calorie is equivalent is a
kilo calorie
for lab we used 1.5kcal/g as average
yup
kcal is highest in the summer at 1.7kcal/gram and drops to
1.3kcal/gram in the winter
Other sets by this creator