Current issue: 59(1)

Under compilation: 59(2)

Scopus CiteScore 2023: 3.5
Scopus ranking of open access forestry journals: 17th
PlanS compliant
Select issue
Silva Fennica 1926-1997
1990-1997
1980-1989
1970-1979
1960-1969
Acta Forestalia Fennica
1953-1968
1933-1952
1913-1932

Articles containing the keyword 'sample plot size'

Category : Article

article id 4776, category Article
K. Stern. (1968). Some considerations on optimal plot size in field experiments with forest trees. Silva Fennica vol. 2 no. 4 article id 4776. https://doi.org/10.14214/sf.a14561
Original keywords: metsänarviointi; menetelmät; koealat; inventointi; koealakoko; metsänmittaus
English keywords: forest inventory; sampling; forest mensuration; methods; sample plots; sample plot size
Abstract | View details | Full text in PDF | Author Info

18 permanent sample subplots of the Swedish and the Hassian Forestry Institute, each measured in equal intervals for several decades, were divided into subplots of different size. An analysis of variance was calculated for every set of subplot size. The development of intraclass-correlations over years and over different sizes of subplots could be explained if three different correlations were assumed: soil-correlation, correlations from irregular distribution of the trees, and correlation resulting from competition. Intraclass-correlations were positive or negative depending on dominance of one or two of these correlations.

An explanatory simultation study of competitional variance showed the effect of the degree of competitional correlations on the variance of means of subplots of different sizes. If this coefficient was small, all variances of subplots means within the range investigated became larger than expected in experiments without competition, with larger coefficients the variances of means of the smaller subplots became smaller, those of larger subplots larger than expected.

Plots of medium or large size are probably optimal for long term experiments with forest trees, if all sources of costs in such experiments are taken into account.

The PDF includes a summary in English and Finnish.

  • Stern, E-mail: ks@mm.unknown (email)

Category : Article

article id 7550, category Article
Aarne Nyyssönen, Pentti Roiko-Jokela, Pekka Kilkki. (1971). Studies on improvement of the efficiency of systematic sampling in forest inventory. Acta Forestalia Fennica no. 116 article id 7550. https://doi.org/10.14214/aff.7550
Keywords: forest inventory; costs; sampling; sample plots; sample plot size; systematic sampling
Abstract | View details | Full text in PDF | Author Info

Emphasis was laid on the finding of regression equations to indicate the dependence of standard error upon various variables in systematic sampling. As a result, the size of sample for a given precision could be computed, under varying alternatives of sample plot size and type. Another task was that of examining inventory costs by means of time studies. On combination of the results in regard to the sample size and survey time, the relative efficiency of different alternatives could be discussed, with a view to the precision of the total volume of growing stock.

The PDF includes a summary in Finnish.

  • Nyyssönen, E-mail: an@mm.unknown (email)
  • Roiko-Jokela, E-mail: pr@mm.unknown
  • Kilkki, E-mail: pk@mm.unknown

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
Your selected articles
Send to email
Finnish Society of Forest Science ., (1977) Seminar on the targets of forestry research and .. Silva Fennica vol. 11 no. 2 article id 4968 (remove) | Edit comment
Helander A. Benj., (1923) Employment in the forestry in Finland Acta Forestalia Fennica vol. 26 no. 1 article id 7089 (remove) | Edit comment
Shimotori S., (1986) Private and municipal forests and the forestry p.. Silva Fennica vol. 20 no. 4 article id 5299 (remove) | Edit comment
Nyyssönen A., (1979) International contacts of Finnish forest research Silva Fennica vol. 13 no. 4 article id 5050 (remove) | Edit comment
Löfgren K. G., (1986) Effects of permanent and non-permanent forest po.. Silva Fennica vol. 20 no. 4 article id 5289 (remove) | Edit comment
Hyttinen O., (1957) Valuable timber trees on settlement farms Silva Fennica vol. no. 92 article id 4658 (remove) | Edit comment
Sarvas R., (1948) Forest tree breeding Silva Fennica vol. no. 64 article id 4586 (remove) | Edit comment
Cubbage F. W., Hodges D. G. (1986) Public and private technical assistance programs.. Silva Fennica vol. 20 no. 4 article id 5298 (remove) | Edit comment
Seppänen V., (1939) Charcoal burning Silva Fennica vol. no. 52 article id 4557 (remove) | Edit comment
Järveläinen V.-P., Vadén T. (1968) Professional insight and its diffusion within fa.. Silva Fennica vol. 2 no. 4 article id 4773 (remove) | Edit comment
Cajander A. K., (1931) Research and higher education of agriculture and.. Silva Fennica vol. no. 18 article id 4459 (remove) | Edit comment