Distance-dependent models for predicting the development of mixed coniferous forests in Finland
Distance-dependent growth models and crown models, based on extensive material, were built for Scots pine and Norway spruce growing in a mixed forest. The crown ratio was also used as a predictor in a diameter growth model to better describe the thinning reaction. The effect of crown ratio on th...
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| Format: | Article |
| Language: | English |
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Finnish Society of Forest Science
1999-01-01
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| Series: | Silva Fennica |
| Online Access: | https://www.silvafennica.fi/article/670 |
| _version_ | 1811315070550933504 |
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| author | Vettenranta, Jouni |
| author_facet | Vettenranta, Jouni |
| author_sort | Vettenranta, Jouni |
| collection | DOAJ |
| description | Distance-dependent growth models and crown models, based on extensive material, were built for Scots pine and Norway spruce growing in a mixed forest. The crown ratio was also used as a predictor in a diameter growth model to better describe the thinning reaction. The effect of crown ratio on the growth dynamics was studied in simulation examples. Monte Carlo simulation was used to correct the bias caused by nonlinear transformations of predictors and response. After thinnings the crown ratio as a predictor was found to be a clear growth-retarding factor. The growth retarding effect was stronger among pines with thinnings from below, whereas the estimated yield of spruces over rotation was slightly greater when the crown ratio was included than without it. With each type of thinning the effect of crown ratio on pine growth was almost the same, but the growth of spruces was clearly delayed when the stand was thinned from above. Simulation examples also showed that it is profitable to raise the proportion of spruces during rotation, since spruces maintain the growth more vigorous at older ages. The total yield during 90 years rotation was about 20% higher if the stand was transformed into a pure spruce stand instead of pine. |
| first_indexed | 2024-04-13T11:23:43Z |
| format | Article |
| id | doaj.art-e422ee24b2a24676bf08b43d150aac3b |
| institution | Directory Open Access Journal |
| issn | 2242-4075 |
| language | English |
| last_indexed | 2024-04-13T11:23:43Z |
| publishDate | 1999-01-01 |
| publisher | Finnish Society of Forest Science |
| record_format | Article |
| series | Silva Fennica |
| spelling | doaj.art-e422ee24b2a24676bf08b43d150aac3b2022-12-22T02:48:45ZengFinnish Society of Forest ScienceSilva Fennica2242-40751999-01-0133110.14214/sf.670Distance-dependent models for predicting the development of mixed coniferous forests in FinlandVettenranta, JouniDistance-dependent growth models and crown models, based on extensive material, were built for Scots pine and Norway spruce growing in a mixed forest. The crown ratio was also used as a predictor in a diameter growth model to better describe the thinning reaction. The effect of crown ratio on the growth dynamics was studied in simulation examples. Monte Carlo simulation was used to correct the bias caused by nonlinear transformations of predictors and response. After thinnings the crown ratio as a predictor was found to be a clear growth-retarding factor. The growth retarding effect was stronger among pines with thinnings from below, whereas the estimated yield of spruces over rotation was slightly greater when the crown ratio was included than without it. With each type of thinning the effect of crown ratio on pine growth was almost the same, but the growth of spruces was clearly delayed when the stand was thinned from above. Simulation examples also showed that it is profitable to raise the proportion of spruces during rotation, since spruces maintain the growth more vigorous at older ages. The total yield during 90 years rotation was about 20% higher if the stand was transformed into a pure spruce stand instead of pine.https://www.silvafennica.fi/article/670 |
| spellingShingle | Vettenranta, Jouni Distance-dependent models for predicting the development of mixed coniferous forests in Finland Silva Fennica |
| title | Distance-dependent models for predicting the development of mixed coniferous forests in Finland |
| title_full | Distance-dependent models for predicting the development of mixed coniferous forests in Finland |
| title_fullStr | Distance-dependent models for predicting the development of mixed coniferous forests in Finland |
| title_full_unstemmed | Distance-dependent models for predicting the development of mixed coniferous forests in Finland |
| title_short | Distance-dependent models for predicting the development of mixed coniferous forests in Finland |
| title_sort | distance dependent models for predicting the development of mixed coniferous forests in finland |
| url | https://www.silvafennica.fi/article/670 |
| work_keys_str_mv | AT vettenrantajouni distancedependentmodelsforpredictingthedevelopmentofmixedconiferousforestsinfinland |