著者

沼田 眞

出版者

公益社団法人 日本植物学会

雑誌

植物学雑誌 (ISSN:0006808X)

巻号頁・発行日

vol.62, no.729, pp.35-38, 1949

被引用文献数

3

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1) Sampling methods in the statistics of plant communities are<br>1&deg;purposive selection by some standard areas<br>2&deg;random sampling by the theory of large samples<br>3&deg;random sampling (areal sampling) by the theory of small samples. We have used the first or second method till now but in plant ecology we are ought to use the third method from now on.<br>2) From the theory of small samples, the confidential interval of population mean is<br>x+d_??_m_??_x-d, d=&tau;u/&radic;N<br>(d is the deviation of the sample mean from the populatin mean under the level of significance &alpha;) The h=d/x will become an indicator of the homogeneity of a plant community. For example, I calculated &ldquo;the coefficient of homogeneity&rdquo; to study various distribution of species on the <i>Ophioglossum</i> <i>thermale-Imperata cylindrica</i> var. <i>Konigii</i>-soc. at Futtu sea-shore of Chiba pref.<br>3) We can know the homogeneity of distribution of a species by the coefficient (h) and then deside the number of sampling quadrats to estimate an analytical character of a community.