Percentile based basal area diameter distribution models for Scots pine, Norway spruce and birch species
Information about diameter distribution is used for predicting stand total volume, timber volume and stand growth for forest management planning. Often, the diameter distribution is obtained by predicting the parameters of some probability density function, using means and sums of tree character...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Finnish Society of Forest Science
2000-01-01
|
| Series: | Silva Fennica |
| Online Access: | https://www.silvafennica.fi/article/619 |
| _version_ | 1818362425910493184 |
|---|---|
| author | Kangas, Annika Maltamo, Matti |
| author_facet | Kangas, Annika Maltamo, Matti |
| author_sort | Kangas, Annika |
| collection | DOAJ |
| description | Information about diameter distribution is used for predicting stand total volume, timber volume and stand growth for forest management planning. Often, the diameter distribution is obtained by predicting the parameters of some probability density function, using means and sums of tree characters as predictors. However, the results have not always been satisfactory: the predicted distributions practically always have a similar shape. Also, multimodal distributions cannot be obtained. However, diameter distribution can also be predicted using distribution-free methods. In the percentile method, the diameters at certain percentiles of the distribution are predicted with models. The empirical diameter distribution function is then obtained by interpolating between the predicted diameters. In this paper, models for diameters at 12 percentiles of stand basal area are presented for Scots pine, Norway spruce and birch species. Two sets of models are estimated: a set with and one without number of stems as a predictor. Including the number of stems as a predictor improved the volume and saw timber volume estimates for all species, but the improvements were especially high for number of stems estimates obtained from the predicted distribution. The use of number of stems as predictor in models is based on the possibility of including this characteristic to measured stand variables. |
| first_indexed | 2024-12-13T21:32:23Z |
| format | Article |
| id | doaj.art-8012c39d73f342ba8723175d4f9027d4 |
| institution | Directory Open Access Journal |
| issn | 2242-4075 |
| language | English |
| last_indexed | 2024-12-13T21:32:23Z |
| publishDate | 2000-01-01 |
| publisher | Finnish Society of Forest Science |
| record_format | Article |
| series | Silva Fennica |
| spelling | doaj.art-8012c39d73f342ba8723175d4f9027d42022-12-21T23:30:46ZengFinnish Society of Forest ScienceSilva Fennica2242-40752000-01-0134410.14214/sf.619Percentile based basal area diameter distribution models for Scots pine, Norway spruce and birch speciesKangas, AnnikaMaltamo, MattiInformation about diameter distribution is used for predicting stand total volume, timber volume and stand growth for forest management planning. Often, the diameter distribution is obtained by predicting the parameters of some probability density function, using means and sums of tree characters as predictors. However, the results have not always been satisfactory: the predicted distributions practically always have a similar shape. Also, multimodal distributions cannot be obtained. However, diameter distribution can also be predicted using distribution-free methods. In the percentile method, the diameters at certain percentiles of the distribution are predicted with models. The empirical diameter distribution function is then obtained by interpolating between the predicted diameters. In this paper, models for diameters at 12 percentiles of stand basal area are presented for Scots pine, Norway spruce and birch species. Two sets of models are estimated: a set with and one without number of stems as a predictor. Including the number of stems as a predictor improved the volume and saw timber volume estimates for all species, but the improvements were especially high for number of stems estimates obtained from the predicted distribution. The use of number of stems as predictor in models is based on the possibility of including this characteristic to measured stand variables.https://www.silvafennica.fi/article/619 |
| spellingShingle | Kangas, Annika Maltamo, Matti Percentile based basal area diameter distribution models for Scots pine, Norway spruce and birch species Silva Fennica |
| title | Percentile based basal area diameter distribution models for Scots pine, Norway spruce and birch species |
| title_full | Percentile based basal area diameter distribution models for Scots pine, Norway spruce and birch species |
| title_fullStr | Percentile based basal area diameter distribution models for Scots pine, Norway spruce and birch species |
| title_full_unstemmed | Percentile based basal area diameter distribution models for Scots pine, Norway spruce and birch species |
| title_short | Percentile based basal area diameter distribution models for Scots pine, Norway spruce and birch species |
| title_sort | percentile based basal area diameter distribution models for scots pine norway spruce and birch species |
| url | https://www.silvafennica.fi/article/619 |
| work_keys_str_mv | AT kangasannika percentilebasedbasalareadiameterdistributionmodelsforscotspinenorwayspruceandbirchspecies AT maltamomatti percentilebasedbasalareadiameterdistributionmodelsforscotspinenorwayspruceandbirchspecies |