Claim · model-written summary
A cross-wire sighting tube minimized pin-thickness errors, but intertangled foliage requires caution.
- Taxon
- heathlandt0
- Treatment
- cross-wire sighting tubee0
- Outcome
- Thesee0
- Direction
- minimizede0
- Comparator
- intertangling of the foliagee0
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleSettingValueQualifier
Verbatim
e0“These can be minimized by the use of a cross-wire sighting tube, but an experiment shows that caution must be exercised in using this device because of the intertangling of the foliage of the various species”
t0“heathland”
Title
The use of point quadrats for the analysis of heathland
RE Winkworth Australian Journal of Botany 1955. doi:10.1071/bt9550068
Other claims from this paper (5)
- Method / resource Inclined quadrats usually yielded higher percentage-cover estimates for heathland species than vertical quadrats.
- Method / resource Inclined quadrats gave no precision advantage for estimating vegetation percentage contribution.
- Method / resource Pin thickness caused large errors in percentage cover estimates for microphyllous heathland vegetation.
- Method / resource Pin size hardly affected percentage-contribution estimates.
- Method / resource Independently randomized pins lowered variance of percentage cover and contribution estimates compared with frames of 10.