ESSCOSMOS/2009:FieldSampling: Difference between revisions
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'''Under Construction''' | |||
==Overview== | ==Overview== | ||
In this activity, we will study the organisms and environment along a gradient from the edge of a marsh to the top of the hill. | In this activity, we will study the organisms and environment along a gradient from the edge of a marsh to the top of the hill. |
Revision as of 22:26, 29 June 2009
Under Construction
Overview
In this activity, we will study the organisms and environment along a gradient from the edge of a marsh to the top of the hill.
Objectives
- Evaluate small scale gradients in biological and environmental conditions along a transect.
- Create graphical summaries of the findings
- Enter data into class database [link to google doc]
Background
The UCI Arboretum map of UCI Arboretum
Materials
- GPS device
- TDR probe for measuring soil moisture
- Thermometer for measuring soil temperature
- Map of garden and surrounding area with 10 x 10 m aligned to one corner of garden (add link to pdf here)
- Portable scale for measuring plant and insect biomass
- Meter stick
- Soil corer
Methods
Class will be divided into five groups of four, and each group will be asked to survey a 100m transect at 20m intervals.
At each 20m interval, record the latitude, longitude, soil moisture, and soil temperature. Sample plants and insects (see below); we will measure biomass in the lab.
Soils
- Measure soil moisture with TDR probe
- Measure soil temperature using thermometer
Insects
Insect Biomass
- take a soil core and place it in a bin
- mix the core well
- pairs of students should place a portion of the soil and count the number insects in each group
- after counting an insect, place it in a pre-weighed tube
- weigh tubes with insects from each group and record
- subtract original tube weight from weight of tube plus insects, this is the insect biomass
Plants
Biomass
- Clip plants along a 150 cm by 10 cm strip at ground level.
- collect plants in a paper bag that is labeled with your group number and site information
- weigh plants and record mass
Results
- Create a spreadsheet based on this template:
- Fill in data for each sample site
- Calculate biomass of plants and insects in units of g or mg per m2
Graphical summary
Graph plant and insect biomass, soil temperature, and soil moisture on a chart. Here is an example; example transect results
Analysis
- Look at your graph and describe any patterns that you see
- Are plant and insect biomass correlated along the gradient?
- How are soil temperature and soil moisture related to plant and insect biomass?
- What other patterns did you see?
- Why do you think that these patterns exist?
Homework
Write a one paragraph summary of your analysis.