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Data Recording and Calculations to Determine Frequency

Data Recording and Calculations to Determine Frequency

The field sheet to record frequency usually includes a species list and a tally is made for every quadrat where the species is recorded. Only a single tally is made for each quadrat, which represents the presence of the species regardless of its abundance. If nested quadrats are used, more than one column is needed to separately recorded each quadrat.


Frequency

Frequency

Frequency is the vegetation attribute that describes the probability of finding a species within a particular area. The probability is based on the occurrence of that species in a series of sample units. For example, if a species has a frequency of 75%, we expect it to occur in three out of every four quadrats examined.


Use of Equipment

Use of Equipment

Poorly functioning equipment can jeopardize sample accuracy and sample precision. All measuring equipment, such as scales used to weigh samples for herbage biomass, should be regularly checked to confirm their accuracy. Other sources of measurement error include plastic tapes stretching with use and variations in pace-length among observers.

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