Simulation model for natural regeneration of Pinus sylvestris, Picea abies, Betula pendula and Betula pubescens.
In the model the regeneration process is derived into three subprocesses: birth, growth and mortality of seedlings. The main emphasis is on the birth process where the following phases are simulated: seed crop, quality of seeds, maturity of seeds, predation of seeds and germination. The parameters a...
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| Format: | Article |
| Language: | English |
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Finnish Society of Forest Science
1987-01-01
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| Series: | Silva Fennica |
| Online Access: | https://www.silvafennica.fi/article/5305 |
| _version_ | 1823997771916509184 |
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| author | Pukkala, Timo |
| author_facet | Pukkala, Timo |
| author_sort | Pukkala, Timo |
| collection | DOAJ |
| description | In the model the regeneration process is derived into three subprocesses: birth, growth and mortality of seedlings. The main emphasis is on the birth process where the following phases are simulated: seed crop, quality of seeds, maturity of seeds, predation of seeds and germination. The parameters are based on data published in Finland. Part of the parameters are obtained directly from the investigations and part is proposed by the author. The model can be calibrated by changing parameter values. The simulation is made with the help of random numbers which have the same means as the estimates and the same distributions as the residuals of the equations used in simulation. The time step of the model is one year. The number of emerged seedlings in one year is obtained by multiplying the seed crop with the probabilities that the seed passes different phases of the birth process. Because of stochasticity the regeneration period is simulated several times. From the results it is possible to evaluate the risk and succeeding probability of the regeneration. The main drawbacks of the simulation method are the lack of empirical parameters and the difficulty of testing. The model could be further developed by including spatiality into the model. The PDF includes an abstract in Finnish. |
| first_indexed | 2024-12-18T17:19:32Z |
| format | Article |
| id | doaj.art-9fb6ba8f5a9c41819f8a1daf447d3322 |
| institution | Directory Open Access Journal |
| issn | 2242-4075 |
| language | English |
| last_indexed | 2024-12-18T17:19:32Z |
| publishDate | 1987-01-01 |
| publisher | Finnish Society of Forest Science |
| record_format | Article |
| series | Silva Fennica |
| spelling | doaj.art-9fb6ba8f5a9c41819f8a1daf447d33222022-12-21T20:59:54ZengFinnish Society of Forest ScienceSilva Fennica2242-40751987-01-0121110.14214/sf.a15462Simulation model for natural regeneration of Pinus sylvestris, Picea abies, Betula pendula and Betula pubescens.Pukkala, TimoIn the model the regeneration process is derived into three subprocesses: birth, growth and mortality of seedlings. The main emphasis is on the birth process where the following phases are simulated: seed crop, quality of seeds, maturity of seeds, predation of seeds and germination. The parameters are based on data published in Finland. Part of the parameters are obtained directly from the investigations and part is proposed by the author. The model can be calibrated by changing parameter values. The simulation is made with the help of random numbers which have the same means as the estimates and the same distributions as the residuals of the equations used in simulation. The time step of the model is one year. The number of emerged seedlings in one year is obtained by multiplying the seed crop with the probabilities that the seed passes different phases of the birth process. Because of stochasticity the regeneration period is simulated several times. From the results it is possible to evaluate the risk and succeeding probability of the regeneration. The main drawbacks of the simulation method are the lack of empirical parameters and the difficulty of testing. The model could be further developed by including spatiality into the model. The PDF includes an abstract in Finnish.https://www.silvafennica.fi/article/5305 |
| spellingShingle | Pukkala, Timo Simulation model for natural regeneration of Pinus sylvestris, Picea abies, Betula pendula and Betula pubescens. Silva Fennica |
| title | Simulation model for natural regeneration of Pinus sylvestris, Picea abies, Betula pendula and Betula pubescens. |
| title_full | Simulation model for natural regeneration of Pinus sylvestris, Picea abies, Betula pendula and Betula pubescens. |
| title_fullStr | Simulation model for natural regeneration of Pinus sylvestris, Picea abies, Betula pendula and Betula pubescens. |
| title_full_unstemmed | Simulation model for natural regeneration of Pinus sylvestris, Picea abies, Betula pendula and Betula pubescens. |
| title_short | Simulation model for natural regeneration of Pinus sylvestris, Picea abies, Betula pendula and Betula pubescens. |
| title_sort | simulation model for natural regeneration of pinus sylvestris picea abies betula pendula and betula pubescens |
| url | https://www.silvafennica.fi/article/5305 |
| work_keys_str_mv | AT pukkalatimo simulationmodelfornaturalregenerationofpinussylvestrispiceaabiesbetulapendulaandbetulapubescens |