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

Nyyssönen, Aarne; Vuokila, Yrjö

Full text of this article is only available in PDF format.

Aarne Nyyssönen , 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

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

Click this link to register to Silva Fennica.

If you are a registered user, log in to save your selected articles for later access.

Contents alert

Export reference to EndNote / RefWorks

Your selected articles
Send to email

Park B.-J., Morikawa T. et al. (2009) Physiological effects of ingesting eucalyptus es.. Silva Fennica vol. 43 no. 1 article id 223 (remove) | Edit comment

Suuriniemi I., Matero J. et al. (2012) Factors affecting enlargement of family forest h.. Silva Fennica vol. 46 no. 2 article id 58 (remove) | Edit comment

Westman C. J., Laine J. et al. (1985) A comparison of gravimetric and volumetric soil .. Silva Fennica vol. 19 no. 1 article id 5232 (remove) | Edit comment

Heikkilä J., Sirén M. et al. (2009) Energy wood thinning as a part of stand manageme.. Silva Fennica vol. 43 no. 1 article id 220 (remove) | Edit comment

Heikurainen L., (1957) Eutrophic pine bogs and their suitability for dr.. Silva Fennica vol. no. 93 article id 4672 (remove) | Edit comment

Kallio A. M. I., (2001) Interdependence of the sawlog, pulpwood and sawm.. Silva Fennica vol. 35 no. 2 article id 598 (remove) | Edit comment

Kalliokoski T., Nygren P. et al. (2008) Coarse root architecture of three boreal tree sp.. Silva Fennica vol. 42 no. 2 article id 252 (remove) | Edit comment

Kaitaniemi P., Riihimäki J. et al. (2007) Experimental evidence for associational resistan.. Silva Fennica vol. 41 no. 2 article id 295 (remove) | Edit comment

Lapointe B., Bradley R. et al. (2006) Nutrient and light availability to white spruce .. Silva Fennica vol. 40 no. 3 article id 330 (remove) | Edit comment

Nurmi J., (1993) Heating values of the above ground biomass of sm.. Acta Forestalia Fennica vol. 0 no. 236 article id 7682 (remove) | Edit comment

Kozlowski T. T., Sasaki S. et al. (1967) Effects of temperature on phytotoxicity of monur.. Silva Fennica vol. 1 no. 3 article id 4752 (remove) | Edit comment

Hellberg E., Josefsson T. et al. (2009) The transformation of a Norway spruce dominated .. Silva Fennica vol. 43 no. 5 article id 173 (remove) | Edit comment

Laurila J., Lauhanen R. (2010) Moisture content of Norway spruce stump wood at .. Silva Fennica vol. 44 no. 3 article id 140 (remove) | Edit comment

Monteleone I., Ferrazzini D. et al. (2006) Effectiveness of neutral RAPD markers to detect .. Silva Fennica vol. 40 no. 3 article id 476 (remove) | Edit comment

Luoranen J., Konttinen K. et al. (2009) Frost hardening and risk of a second flush in No.. Silva Fennica vol. 43 no. 2 article id 209 (remove) | Edit comment

Sarkkola S., Hökkä H. et al. (2004) Natural development of stand structure in peatla.. Silva Fennica vol. 38 no. 4 article id 408 (remove) | Edit comment

Rosenberg O., Jacobson S. (2004) Effects of repeated slash removal in thinned sta.. Silva Fennica vol. 38 no. 2 article id 423 (remove) | Edit comment

Rouvinen S., Kouki J. (2011) Tree regeneration in artificial canopy gaps esta.. Silva Fennica vol. 45 no. 5 article id 88 (remove) | Edit comment

Katila M., (2006) Empirical errors of small area estimates from th.. Silva Fennica vol. 40 no. 4 article id 324 (remove) | Edit comment

Hänninen R., Kallio A. M. I. (2007) Economic impacts on the forest sector of increas.. Silva Fennica vol. 41 no. 3 article id 286 (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