home
focus and scope
journal policies
Focus and scope Peer review process Openness and transparency Publication frequency Archiving Article processing charges Criteria for authorship and contributors Conflicts of interest Allegations of misconduct Complaints process Sponsors Journal History
author instructions
General Metadata Article Categories Openness and transparency Submission of manuscripts Manuscript text Citation standards Tables and figures Acknowledgements, funding and availability of research materials and data Supplementary files Procedures for revised and accepted manuscripts
special issues
editors
open access
other journals
Metsätieteen aikakauskirja Dissertationes Forestales Suo - Mires and Peat
contact
financial information
Full text of this article is only available in PDF format.

Aarne Nyyssönen (email), Yrjö Vuokila

The effect of stratification on the number of sample plots of different sizes

Nyyssönen A., Vuokila Y. (1963). The effect of stratification on the number of sample plots of different sizes. Acta Forestalia Fennica vol. 75 no. 2 article id 7136. https://doi.org/10.14214/aff.7136

Abstract

It is necessary to study the problems related to the size, number and location of sample plots as well as to the effect of stratification. This paper, mainly concerned with the volume of the growing stock based on measurements, comprises a part of the research in progress related to the issue.

The study contains a discussion of certain problems relevant to the planning of a forest inventory on the basis of variation in the volume of the growing stock. In particular, the aim has been to give data for selection of the size and number of sample plots, and to illustrate the importance of stratification, here based principally on dominant height.

The research material comprised two forest areas of 10 ha each; measurement of the growing stock was made in units of 49 m2. Based on the data was constructed a model area embracing 4 forested strata and one non-forested stratum. The mean and standard deviations of the volumes was calculated for the forest area as a whole and for the different strata. On studying stratification, two approaches were employed to distribute the sample plots among the strata: optimum allocation and proportional allocation. The latter is simple in application, and gave for forested areas number of sample plots which did not exceed by more than 10% those obtained by optimum allocation. It is obvious that the application of stratification is worthy of consideration within forest areas which comprise parts with distinct differences. The decrease in number of plots with increasing plot size is considerably more marked within a stratified area. Thus, larger sample plots should be used in the former case than in the later. The investigations give hints on how forest inventories should be carried out. However, it has some limitations, which are discussed in the paper.

The PDF includes a summary in English.

Keywords
forest inventory; inventory; methods; sample plots

Published in 1963

Views 3310

Available at https://doi.org/10.14214/aff.7136 | Download PDF

Creative Commons License CC BY-SA 4.0
Register
Click this link to register to Silva Fennica.
Log in
If you are a registered user, log in to save your selected articles for later access.
Contents alert
Sign up to receive alerts of new content
Export reference to EndNote / RefWorks
Related articles
Your selected articles
Send to email
Kalela E. K., (1936) Studies on the development of mixed forest of No.. Acta Forestalia Fennica vol. 44 no. 2 article id 7330 (remove) | Edit comment
Pasanen K., (1998) Integrating variation in tree growth into forest.. Silva Fennica vol. 32 no. 1 article id 697 (remove) | Edit comment
Nyyssönen A., Vuokila Y. (1963) The effect of stratification on the number of sa.. Acta Forestalia Fennica vol. 75 no. 2 article id 7136 (remove) | Edit comment
Your search results
Silva Fennica · Finnish Society of Forest Science