Methods of sampling

This is a brief summary from the OCR requirement

HideShow resource information
  • Created by: Dillys
  • Created on: 19-05-11 06:49
Preview of Methods of sampling

First 281 words of the document:

METHODS OF SAMPLING
PLANT SAMPING
USING RANDOM QUADRATS
A quadrat is a square frame used to define the size of the sample area
Often 50cm or 1cm on each side
The quadrat is placed at random in the habitat
Imagine the area as a large grid and place the quadrat at the coordinates as pairs of
random numbers
The plants found within the frame are identified and their abundance measured
An abundance or percentage cover can be measured in the following ways
Using an ACFOR scale which involves observing the contents of the quadrat and
applying an abundance score to each specie.
By using a quadrat that has a grid of strings that divides the quadrat into a
number of smaller squares usually a hundred
Also using a point frame which has long needles or pointers. The frame is lowered
into the quadrat and the plants which touch the needles are recorded. Each plant
touching the needle has 1% cover, this is because if the frame has 10 needles
and used ten times there will be a hundred readings .
USING A TRANSECT
A transect is a line taken across a habitat
A long rope or tape measure is stretch across the habitat and samples along the line are
taken
When a quadrat is used at set intervals along the line in a large habitat it is called
interrupted bell transect
when a quadrat is placed along the line and a band or a belt is studied in detailed is called
a continuous transect
ANIMAL SAMPLING

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

SWEEP NETTING
This technique is suitable for a low vegetation, not too woody.…read more

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all resources »