8/9/2019 ecosystems test correction.docx
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Emily Coash
Ecosystem Function Test Corrections
1(dii) State two factors that limit the primary productivity of
such ecosystems
Factors that limit the primary productivity of deserts are low
rainfall and high temperature.
2(aiii) Outline and evaluate a method to measure one of the
selected abiotic factors
A method to measure light intensity would be to use a light
meter. In order to properly do this,
you would hold the meter at the surface of the sol and loin the
meter in the direction with the strongest
light intensity. Do this multiple times to ensure the results
are accurate and consistent.. This would be
a good method to use because it is easy to do with the help of
an instrument. A problem you may
encounter by using this method is not measuring the light
intensity of the light at the same
direction/angle each trial.
2b) Name an organism found in the ecosystem specified above.
Describe and evaluate a
method for estimating its abundanceTrees are found within
tropical rainforest to estimate abundance of trees you can use
the
quadrate method. To do this you pick random sections of a chosen
area to collect data then you use a
population index formula. Make sure you redo this process
several times to ensure the data collected
is accurate and consistent. This method would be good to use
because it is collecting data throughout
an area in various parts which would be more accurate to
represent the area as a whole rather than
one small section of it. A mistake that may be encountered while
using this method would be
calculation errors while using the population index formula.
3) For a named consumer organism shown in the diagram
above,describe and evaluate a
method for measuring its gross and net secondary
productivity
4c) State and explain the changes in the total biomass in the
graph
4f) Determine the total plant biomass 200 years after the
retreat of the glacier
Paper 2Essay #1
The net primary productivity of an ecosystem is different in
each biome. In Tropical rain forests,
the net primary productivity falls over 2000 gm-2/yr-2. In
deserts, the net primary productivity falls
under 500gm-2/yr-2. These two biomes are very different which
causes the net primary productivitys
to be so different. The tropical rainforest has a very diverse
and complex population. There are many
different plant species and the abiotic factors such as hot,
humid climate and high amounts of
precipitation, cause the net primary productivity to be at a
high rate. Deserts have a very dry and hot
climate which is a reason for its low net primary
productivity.
A factors that influence productivity are the quality of soil in
an ecosystem. When the soil is
fertile and has high quality, more productivity takes place.
Temperature is also another factor that can
