. Research methods in ecology. Plant ecology. QUADRATS 165 203. Locating quadrats. In staking a quadrat, the end tapes are in- variably placed so that the numbers read from left to right, and the side tapes so that they read down. In mapping, a fifth tape is stretched parallel to the top, and as each decimeter strip is marked, the outer tape is shifted to delimit the new strip. Indeed, the side tapes can be placed alone, and the plotting tapes moved down one at a time as the mapping proceeds, but it is usually more satisfactory to locate the quadrat exactly and to square it first, a task most
. Research methods in ecology. Plant ecology. QUADRATS 165 203. Locating quadrats. In staking a quadrat, the end tapes are in- variably placed so that the numbers read from left to right, and the side tapes so that they read down. In mapping, a fifth tape is stretched parallel to the top, and as each decimeter strip is marked, the outer tape is shifted to delimit the new strip. Indeed, the side tapes can be placed alone, and the plotting tapes moved down one at a time as the mapping proceeds, but it is usually more satisfactory to locate the quadrat exactly and to square it first, a task most easily done by enclosing the whole quadrat, and then using a fifth tape. In the case of list quadrats in open vegetation, the measuring strip is unnecessary, but as a rule it facilitates counting, as well as tl^ -L^ â »â -j,vr*v. *- AiJ^ J? jp^ "HtwC>Ttu«^-ri ^,. â ^'%>^::"- Fig. 50. Mapping a major quadrat on Mount Garfield at 3,600 m. The List Quadrat 204. Description. This, as the simplest form of quadrat, is employed primarily to ascertain the abundance of species in a formation or during a- particular aspect of it. Since this can be obtained readily from the chart, the list quadrat has fallen more and more into disuse, except where it is desired to determine abundance alone, or to aid in deciding whether a chart is really representative. The size depends almost wholly upon the nature of the vegetation. When the number of trees is to be determined, a quadrat of 10 or 50 meters is necessary. In ordinary herbaceous forma- tions", the usual size is 2 meters, while the meter quadrat is used when the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Clements, Frederic E. (Frederic Edward), 1874-1945. Lincoln, Neb. , University Pub. Co.
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