Study of different height-diameter models for hornbeam (Carpinus betulus L.) in uneven-aged stands of Shastkalateh forest of Gorgan
Projection of stand development over time relies on accurate height-diameter functions. In this study, we evaluated the capability of 18 nonlinear models to estimate hornbeam heights in a portion Shastkalateh experimental forest in Gorgan, Golestan province. We applied a systematic random sampling m...
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| Format: | Article |
| Language: | fas |
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Research Institute of Forests and Rangelands of Iran
2016-12-01
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| Series: | تحقیقات جنگل و صنوبر ایران |
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| Online Access: | http://ijfpr.areeo.ac.ir/article_109448_b3e4bbc48218724cb0ec08390f5dcfee.pdf |
| _version_ | 1828321865883451392 |
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| author | Jahangir Mohammadi Sha'ban Shataee |
| author_facet | Jahangir Mohammadi Sha'ban Shataee |
| author_sort | Jahangir Mohammadi |
| collection | DOAJ |
| description | Projection of stand development over time relies on accurate height-diameter functions. In this study, we evaluated the capability of 18 nonlinear models to estimate hornbeam heights in a portion Shastkalateh experimental forest in Gorgan, Golestan province. We applied a systematic random sampling method to collect field data within a 150×200 meter network (3.33% intensity). It resulted in 308 circular plots with 17.84 m (0.1 ha) radius. In each plot tree species, height and diameter at breast height (DBH) of all trees with DBH>12.5 cm were measured, resulting in 2177 pairs of measured height-diameter. From the available dataset, we included 75% in the model development and the remaining 25% to validate the models. The relationship between height (dependent variable) and DBH (independent variable) was analyzed using 18 non-linear regression models. The results showed no significant difference between the applied model diagnostics, and the applied t-test showed non-significant mean stand height estimation using all models and actual height at 99% confidence level, with the exception of the Prodan model. In addition, the results of Hyperbolic, Ratkofsky, Richard-chapman and Weibull models with RMSE% of 12.91%, 12.92%, 13.01% and 13.01% and Bias% of 0.21%, 0.21%, 0.22% and 0.22%, respectively were almost similar in that they were better predictors of hornbeam height. Based on the results, we conclude that these models can be used for predicting hornbeam height in similar broadleaved stands of northern Iran, provided that comparative studies are conducted elsewhere to approve the results obtained here. |
| first_indexed | 2024-04-13T18:32:31Z |
| format | Article |
| id | doaj.art-b208df4eaa2b4395be77fb2421b16d64 |
| institution | Directory Open Access Journal |
| issn | 1735-0883 2383-1146 |
| language | fas |
| last_indexed | 2024-04-13T18:32:31Z |
| publishDate | 2016-12-01 |
| publisher | Research Institute of Forests and Rangelands of Iran |
| record_format | Article |
| series | تحقیقات جنگل و صنوبر ایران |
| spelling | doaj.art-b208df4eaa2b4395be77fb2421b16d642022-12-22T02:35:01ZfasResearch Institute of Forests and Rangelands of Iranتحقیقات جنگل و صنوبر ایران1735-08832383-11462016-12-0124471270010.22092/ijfpr.2016.109448109448Study of different height-diameter models for hornbeam (Carpinus betulus L.) in uneven-aged stands of Shastkalateh forest of GorganJahangir Mohammadi0Sha'ban Shataee1Assistant Prof., Department of Forestry, Faculty of Forest Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, IranAssociate Prof., Department of Forestry, Faculty of Forest Science, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, IranProjection of stand development over time relies on accurate height-diameter functions. In this study, we evaluated the capability of 18 nonlinear models to estimate hornbeam heights in a portion Shastkalateh experimental forest in Gorgan, Golestan province. We applied a systematic random sampling method to collect field data within a 150×200 meter network (3.33% intensity). It resulted in 308 circular plots with 17.84 m (0.1 ha) radius. In each plot tree species, height and diameter at breast height (DBH) of all trees with DBH>12.5 cm were measured, resulting in 2177 pairs of measured height-diameter. From the available dataset, we included 75% in the model development and the remaining 25% to validate the models. The relationship between height (dependent variable) and DBH (independent variable) was analyzed using 18 non-linear regression models. The results showed no significant difference between the applied model diagnostics, and the applied t-test showed non-significant mean stand height estimation using all models and actual height at 99% confidence level, with the exception of the Prodan model. In addition, the results of Hyperbolic, Ratkofsky, Richard-chapman and Weibull models with RMSE% of 12.91%, 12.92%, 13.01% and 13.01% and Bias% of 0.21%, 0.21%, 0.22% and 0.22%, respectively were almost similar in that they were better predictors of hornbeam height. Based on the results, we conclude that these models can be used for predicting hornbeam height in similar broadleaved stands of northern Iran, provided that comparative studies are conducted elsewhere to approve the results obtained here.http://ijfpr.areeo.ac.ir/article_109448_b3e4bbc48218724cb0ec08390f5dcfee.pdfHeight-diameter modelhornbeaminventoryShast Kalate of Gorgan |
| spellingShingle | Jahangir Mohammadi Sha'ban Shataee Study of different height-diameter models for hornbeam (Carpinus betulus L.) in uneven-aged stands of Shastkalateh forest of Gorgan تحقیقات جنگل و صنوبر ایران Height-diameter model hornbeam inventory Shast Kalate of Gorgan |
| title | Study of different height-diameter models for hornbeam (Carpinus betulus L.) in uneven-aged stands of Shastkalateh forest of Gorgan |
| title_full | Study of different height-diameter models for hornbeam (Carpinus betulus L.) in uneven-aged stands of Shastkalateh forest of Gorgan |
| title_fullStr | Study of different height-diameter models for hornbeam (Carpinus betulus L.) in uneven-aged stands of Shastkalateh forest of Gorgan |
| title_full_unstemmed | Study of different height-diameter models for hornbeam (Carpinus betulus L.) in uneven-aged stands of Shastkalateh forest of Gorgan |
| title_short | Study of different height-diameter models for hornbeam (Carpinus betulus L.) in uneven-aged stands of Shastkalateh forest of Gorgan |
| title_sort | study of different height diameter models for hornbeam carpinus betulus l in uneven aged stands of shastkalateh forest of gorgan |
| topic | Height-diameter model hornbeam inventory Shast Kalate of Gorgan |
| url | http://ijfpr.areeo.ac.ir/article_109448_b3e4bbc48218724cb0ec08390f5dcfee.pdf |
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