quadrat

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Related to quadrats: quadrat sampling

quad·rat

 (kwŏd′rət, -răt′)
n.
1. Printing A piece of type metal lower than the raised typeface, used for filling spaces and blank lines. Also called quad2.
2. Any of a group of small, usually rectangular plots of land used for sampling the occurrence of species or of archaeological artifacts.

[Middle English, a square geometric instrument, rectangular area; see quadrate.]

quadrat

(ˈkwɒdrət)
n
1. (Botany) ecology an area of vegetation, often one square metre, marked out for study of the plants in the surrounding area
2. (Environmental Science) the frame used to mark out such an area
[C14 (meaning "a square"): variant of quadrate]

quad•rat

(ˈkwɒd rət)

n.
2. a square or rectangular plot of land marked off for the study of plants and animals.
[1675–85; variant of quadrate]

quadrat

a plot of land, square or rectangular, marked off or set out for the study of plant or animal life.
See also: Animals
References in periodicals archive ?
1986; Upton and Fingleton, 1985), we limited our analysis to quadrats for which we had a minimum of eight pairs of samples each for at least the first four distance classes (0-32, 32-64, 64-96, and 96-128 cm).
Soil samples were collected from quadrats 0-10, 20-30 and 50-60 metres from the edge of each site and germinated, and the resulting seedlings identified.
We examined the correlation between seed size (mass) and spatial and temporal distribution and abundance of plants, using both published data from northern England and 18 years of census data from permanent quadrats in the Chihuahuan Desert, Arizona, USA.
Leaf height (0-10 cm, 11-20 cm, 21-40 cm, 41-80 cm, 81-160 cm, [greater than]160 cm) was classified based on the tallest individual observed in the study quadrats.
To map the spatial location of individual plants sampled for genetic analyses, I divided the False Bay intertidal eelgrass population into eight 100 m x 100 m quadrats in 1991 and 10 equally sized quadrats in 1992 [ILLUSTRATION FOR FIGURE 1 OMITTED].
In these studies, the biomass for different fishing zones was estimated using the samples obtained by scraping the rocky surface within quadrats.
quadrats within the entire 200 m reach, extending across the entire width of the river for the length of the survey area.
Floristic information was recorded in 1 m(2) quadrats along either 50 m or 100 m transects (14 and 6 sites, respectively).
Within the four sampling sites (Site I-IV) adjacent quadrats of 20 m x 20 m were designated (16 quadrats in Site I and II, 12 quadrats in Site III and IV, see Fig.
Around the pans, 14 sampling sites were positioned and 34 quadrats or belts were sampled within these sites.