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An assessment of the statistical performance of the horizontal point sampling (HPS) in an open coppice forest
Department of Forest Resource Management, Swedish University of Agricultural Sciences, SLU, Umeå, Sweden.
Umeå University, Faculty of Science and Technology, Department of Physics.
Department of Forestry, Faculty of Natural, Resources, Sari University of Agricultural Sciences and Natural Resources, Mazandaran, Sari, Iran.
Department of Forestry, Faculty of Natural Resources, Lorestan University, Khorramabad, Lorestan, Iran.
2024 (English)In: Austrian Journal of Forest Science, ISSN 0379-5292, Vol. 141, no 3, p. 215-240Article in journal (Refereed) Published
Abstract [en]

Sampling surveys are broadly employed in forest inventories due to their efficiency in quantifying forest characteristics. To this end, selecting an appropriate sampling met-hod is essential. This study introduces a new application of horizontal point sampling (HPS). We assess the statistical properties of HPS with variations in crown basal area factor (CBAF) and sample sizes (n). The study further conducts a comparative analysis between HPS and fixed-radius (FR) plot sampling methods. The study was done in an actual open coppice forest and in a simulated forest, using sampling simulations with a large number of repetitions. In HPS, a greater CBAF for a given sample size lead to a higher relative standard error (RSE %). Multiple regression model showed that both n and CBAF influence RSE %. There was an inverse relationship between n and RSE%, whereas a positive relationship was found between CBAF and RSE %. A combination of HPS and crown relascope is easily applicable in forest inventories. This combined method demonstrates efficiency, when compared to the traditional FR for estimating crown cover area in open coppice forests.

Place, publisher, year, edition, pages
University of Natural Resources and Life Sciences; Austrian Research Centre for Forests , 2024. Vol. 141, no 3, p. 215-240
Keywords [en]
Monte-Carlo simulation, Forest inventory, Open sparse oak forest, Zagros forest, Sampling methods
National Category
Forest Science Environmental Sciences related to Agriculture and Land-use
Identifiers
URN: urn:nbn:se:umu:diva-232461ISI: 001335756000003OAI: oai:DiVA.org:umu-232461DiVA, id: diva2:1917235
Available from: 2024-12-02 Created: 2024-12-02 Last updated: 2024-12-02Bibliographically approved

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Austrian Journal of Forest Science
Forest ScienceEnvironmental Sciences related to Agriculture and Land-use

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf