A model for the sap yield of birches tapped by citizen scientists
The sap yield of birches ( Roth and Ehrh.) was modelled as a function of tree diameter (girth) at breast height, as well as site and stand characteristics measured and reported by citizen scientists representing mainly non-industrial private forest owners in the South Savo, North Karelia, and Northe...
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Finnish Society of Forest Science
2022
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ftdoajarticles:oai:doaj.org/article:fdfb1a4b96894abea3bc4209622a31a8 2023-05-15T17:00:20+02:00 A model for the sap yield of birches tapped by citizen scientists Jari Miina Mikko Kurttila 2022-01-01T00:00:00Z https://doi.org/10.14214/sf.10679 https://doaj.org/article/fdfb1a4b96894abea3bc4209622a31a8 EN eng Finnish Society of Forest Science https://www.silvafennica.fi/article/10679 https://doaj.org/toc/2242-4075 2242-4075 doi:10.14214/sf.10679 https://doaj.org/article/fdfb1a4b96894abea3bc4209622a31a8 Silva Fennica, Vol 56, Iss 2 (2022) Forestry SD1-669.5 article 2022 ftdoajarticles https://doi.org/10.14214/sf.10679 2022-12-31T08:02:03Z The sap yield of birches ( Roth and Ehrh.) was modelled as a function of tree diameter (girth) at breast height, as well as site and stand characteristics measured and reported by citizen scientists representing mainly non-industrial private forest owners in the South Savo, North Karelia, and Northern Ostrobothnia regions in Finland. Birches (tree species not recorded) growing on both mineral and peatland sites were tapped during the springs of 2019 and 2020. Citizen scientists were mainly voluntary forest owners who received the instructions and equipment (spouts, drop lines and buckets) for collecting sap from three birches of different diameters in the same birch stand. Citizen scientists were instructed to measure and report the sap yield and girth of the trees, as well as stand characteristics from the forest resource data, if available. Based on the linear mixed model fitted to the data, the sap yield increased with the increasing tree diameter and mean stand height, and varied between years, stands, and trees; between-region variation was not significant. In a birch stand, the simulated total sap yield haâ1 was depended on the average tree size and the stem number haâ1 and was at its highest just before the first commercial thinning and again before the second thinning. The sap model can be used to predict the necessary sap yield in profitability analyses for sap tapping.Betula pendulaB. pubescens Article in Journal/Newspaper karelia* Directory of Open Access Journals: DOAJ Articles Silva Fennica 56 2 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Forestry SD1-669.5 |
spellingShingle |
Forestry SD1-669.5 Jari Miina Mikko Kurttila A model for the sap yield of birches tapped by citizen scientists |
topic_facet |
Forestry SD1-669.5 |
description |
The sap yield of birches ( Roth and Ehrh.) was modelled as a function of tree diameter (girth) at breast height, as well as site and stand characteristics measured and reported by citizen scientists representing mainly non-industrial private forest owners in the South Savo, North Karelia, and Northern Ostrobothnia regions in Finland. Birches (tree species not recorded) growing on both mineral and peatland sites were tapped during the springs of 2019 and 2020. Citizen scientists were mainly voluntary forest owners who received the instructions and equipment (spouts, drop lines and buckets) for collecting sap from three birches of different diameters in the same birch stand. Citizen scientists were instructed to measure and report the sap yield and girth of the trees, as well as stand characteristics from the forest resource data, if available. Based on the linear mixed model fitted to the data, the sap yield increased with the increasing tree diameter and mean stand height, and varied between years, stands, and trees; between-region variation was not significant. In a birch stand, the simulated total sap yield haâ1 was depended on the average tree size and the stem number haâ1 and was at its highest just before the first commercial thinning and again before the second thinning. The sap model can be used to predict the necessary sap yield in profitability analyses for sap tapping.Betula pendulaB. pubescens |
format |
Article in Journal/Newspaper |
author |
Jari Miina Mikko Kurttila |
author_facet |
Jari Miina Mikko Kurttila |
author_sort |
Jari Miina |
title |
A model for the sap yield of birches tapped by citizen scientists |
title_short |
A model for the sap yield of birches tapped by citizen scientists |
title_full |
A model for the sap yield of birches tapped by citizen scientists |
title_fullStr |
A model for the sap yield of birches tapped by citizen scientists |
title_full_unstemmed |
A model for the sap yield of birches tapped by citizen scientists |
title_sort |
model for the sap yield of birches tapped by citizen scientists |
publisher |
Finnish Society of Forest Science |
publishDate |
2022 |
url |
https://doi.org/10.14214/sf.10679 https://doaj.org/article/fdfb1a4b96894abea3bc4209622a31a8 |
genre |
karelia* |
genre_facet |
karelia* |
op_source |
Silva Fennica, Vol 56, Iss 2 (2022) |
op_relation |
https://www.silvafennica.fi/article/10679 https://doaj.org/toc/2242-4075 2242-4075 doi:10.14214/sf.10679 https://doaj.org/article/fdfb1a4b96894abea3bc4209622a31a8 |
op_doi |
https://doi.org/10.14214/sf.10679 |
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Silva Fennica |
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56 |
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2 |
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1766052983000268800 |