Subtitle:

Methods for measuring the population density of higher plants ; Metody pomiaru zagęszczenia roślin wyższych

Contributor:

Polska Akademia Nauk. Komitet Ekologii

Publisher:

Państwowe Wydawnictwa Naukowe

Place of publishing:

Warszawa

Description:

Pages 127-143 ; 24 cm ; Bibliographical references (pages 141-143) ; Abstract in English

Type of object:

Journal/Article

Abstract:

The methods for measuring the density of the population of higher plants are described and discussed. These methods can be divided into two main groups: surface and unsurface.Surface methods are based on the estimate of the number of individuals per a unit of sample plot. The measuring result depends first of all on the size of this plat (Fig. 1) and the number of repeats, to a lesser extent on its shape (Table I).The distance between a determined point and an individual of the population is the basis of unsurface methods: the closest individual method, the nearest neighbour method, random pairs method, point-centered quarter method, wander- ing quarter method (Fig. 2, Fig. 3). The number of repeats and the distance between points affect mainly the results.Both in surface and unsurface methods there are (according to the purpose and object of investigations) four sampling plans: random, ‘ systematic, random- -systematic and systematic-random.The principal condition for the representative character of the sample, independently of the method, is an appropriate number of repeats. The sample size, the size of sample plot (in surface methods) or the distance between points (in unsurface methods), the date and frequency of sampling (Fig. 4) should be empirically determined for a given object using the method of initial small sample.

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Relation:

Wiadomości Ekologiczne

Volume:

24

Issue:

2

Start page:

127

End page:

143

Detailed Resource Type:

Article

Resource Identifier:

oai:rcin.org.pl:156873 ; ISSN 0013-2969

Source:

MiIZ PAN, call no. P.3259 ; click here to follow the link

Language:

pol

Language of abstract:

eng

Rights:

Creative Commons Attribution BY 3.0 PL license

Terms of use:

Copyright-protected material. [CC BY 3.0 PL] May be used within the scope specified in Creative Commons Attribution BY 3.0 PL license, full text available at: ; -

Digitizing institution:

Museum and Institute of Zoology of the Polish Academy of Sciences

Original in:

Library of the Museum and Institute of Zoology of the Polish Academy of Sciences

Projects co-financed by:

Operational Program Digital Poland, 2014-2020, Measure 2.3: Digital accessibility and usefulness of public sector information; funds from the European Regional Development Fund and national co-financing from the state budget.

Access:

Open