Development of regional mixed-effects height–diameter models for natural black pine stands
In this study, linear mixed-effects height-diameter models were developed for natural black pine (Pinus nigra J. F. Arnold.) stands in the Isparta-Eğirdir region. Data collected from 135 sample plots between 2021 and 2022, consisting of 4,271 sample trees, were used for parameter estimation and cali...
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| Format: | Article |
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Isparta University of Applied Sciences Faculty of Forestry
2024-12-01
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| Series: | Turkish Journal of Forestry |
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| Online Access: | https://dergipark.org.tr/tr/download/article-file/4277643 |
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| author | Ramazan Ozçelik Onur Alkan |
| author_facet | Ramazan Ozçelik Onur Alkan |
| author_sort | Ramazan Ozçelik |
| collection | DOAJ |
| description | In this study, linear mixed-effects height-diameter models were developed for natural black pine (Pinus nigra J. F. Arnold.) stands in the Isparta-Eğirdir region. Data collected from 135 sample plots between 2021 and 2022, consisting of 4,271 sample trees, were used for parameter estimation and calibration testing. The mean diameter and height in the model development group were 34.35 cm and 15.40 m, respectively, while in the test group, these values were 31.26 cm and 14.07 m. Various calibration alternatives, utilizing 1 to 10 trees, were tested to improve prediction performance. The results showed significant improvements in prediction accuracy of the models, especially with calibrations involving 5 or 10 trees. Compared to the fixed-effects model, the mixed-effects model achieved a 32% reduction in the root mean square error (RMSE). The findings suggest that the proposed model is highly suitable for forest inventory studies to predict tree heights in black pine stands. |
| format | Article |
| id | doaj-art-990f9ed5af2a4d8791fc0b500af1d94b |
| institution | Kabale University |
| issn | 2149-3898 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Isparta University of Applied Sciences Faculty of Forestry |
| record_format | Article |
| series | Turkish Journal of Forestry |
| spelling | doaj-art-990f9ed5af2a4d8791fc0b500af1d94b2025-01-04T13:20:04ZengIsparta University of Applied Sciences Faculty of ForestryTurkish Journal of Forestry2149-38982024-12-0125439940710.18182/tjf.15647101656Development of regional mixed-effects height–diameter models for natural black pine standsRamazan Ozçelik0Onur Alkan1ISPARTA UYGULAMALI BİLİMLER ÜNİVERSİTESİISPARTA UYGULAMALI BİLİMLER ÜNİVERSİTESİ, ORMAN FAKÜLTESİ, ORMAN MÜHENDİSLİĞİ BÖLÜMÜ, ORMAN AMENAJMANI ANABİLİM DALIIn this study, linear mixed-effects height-diameter models were developed for natural black pine (Pinus nigra J. F. Arnold.) stands in the Isparta-Eğirdir region. Data collected from 135 sample plots between 2021 and 2022, consisting of 4,271 sample trees, were used for parameter estimation and calibration testing. The mean diameter and height in the model development group were 34.35 cm and 15.40 m, respectively, while in the test group, these values were 31.26 cm and 14.07 m. Various calibration alternatives, utilizing 1 to 10 trees, were tested to improve prediction performance. The results showed significant improvements in prediction accuracy of the models, especially with calibrations involving 5 or 10 trees. Compared to the fixed-effects model, the mixed-effects model achieved a 32% reduction in the root mean square error (RMSE). The findings suggest that the proposed model is highly suitable for forest inventory studies to predict tree heights in black pine stands.https://dergipark.org.tr/tr/download/article-file/4277643boy tahminitahmin performansıdoğrusal regresyonkalibrasyonheight predictionprediction performancelinear regressioncalibration |
| spellingShingle | Ramazan Ozçelik Onur Alkan Development of regional mixed-effects height–diameter models for natural black pine stands Turkish Journal of Forestry boy tahmini tahmin performansı doğrusal regresyon kalibrasyon height prediction prediction performance linear regression calibration |
| title | Development of regional mixed-effects height–diameter models for natural black pine stands |
| title_full | Development of regional mixed-effects height–diameter models for natural black pine stands |
| title_fullStr | Development of regional mixed-effects height–diameter models for natural black pine stands |
| title_full_unstemmed | Development of regional mixed-effects height–diameter models for natural black pine stands |
| title_short | Development of regional mixed-effects height–diameter models for natural black pine stands |
| title_sort | development of regional mixed effects height diameter models for natural black pine stands |
| topic | boy tahmini tahmin performansı doğrusal regresyon kalibrasyon height prediction prediction performance linear regression calibration |
| url | https://dergipark.org.tr/tr/download/article-file/4277643 |
| work_keys_str_mv | AT ramazanozcelik developmentofregionalmixedeffectsheightdiametermodelsfornaturalblackpinestands AT onuralkan developmentofregionalmixedeffectsheightdiametermodelsfornaturalblackpinestands |