Proper quadrat and sample sizes for sampling species frequency vary among vegetation types. This study found 10 × 10-cm quadrats most appropriate for frequency sampling dry mountain meadows when using a single quadrat size. If large, broad-leaved forbs are of special interest, 25 × 25-cm, 25 × 50-cm, or 50 × 50-cm quadrats may be useful. One hundred 10 × 10-cm quadrats adequately sampled most common species at alpha = 0.20 ± 10% frequency. In contrast, more than five hundred 0.29-m2 circular plots usually were needed to sample individual species yield at alpha = 0.20 ± 20% of the mean.
Mosley, Jeffrey C.; Bunting, Stephen C.; and Hironaka, M.
"Quadrat and sample sizes for frequency sampling mountain meadow vegetation,"
Great Basin Naturalist: Vol. 49
, Article 11.
Available at: http://scholarsarchive.byu.edu/gbn/vol49/iss2/11