Evaluation of distance methods for estimating population density in Populus euphratica Olivier natural stands (case study: Maroon riparian forests, Iran)
The aim of this study was to determine the performance of distance methods in terms of accuracy, precision, bias, consumed time and sampling efficiency in the Maroon riparian forests, Iran. 40 estimators were used to evaluate the density of Populus euphratica Olivier trees in pure and mixed stands....
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| Format: | Article |
| Language: | English |
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Czech Academy of Agricultural Sciences
2018-05-01
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| Series: | Journal of Forest Science |
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| Online Access: | https://jfs.agriculturejournals.cz/artkey/jfs-201805-0005_evaluation-of-distance-methods-for-estimating-population-density-in-populus-euphratica-olivier-natural-stands.php |
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| author | Reza BASIRI Mostafa MORADI Bahman KIANI Maryam MAASUMI BABAARABI |
| author_facet | Reza BASIRI Mostafa MORADI Bahman KIANI Maryam MAASUMI BABAARABI |
| author_sort | Reza BASIRI |
| collection | DOAJ |
| description | The aim of this study was to determine the performance of distance methods in terms of accuracy, precision, bias, consumed time and sampling efficiency in the Maroon riparian forests, Iran. 40 estimators were used to evaluate the density of Populus euphratica Olivier trees in pure and mixed stands. Fifty quadrates (30 × 30 m) were established in each stand. To evaluate the accuracy, precision, bias, consumed time and efficiency of sampling techniques, relative root mean square error - RRMSE (%), coefficient of variation - CV (%), relative bias - RBIAS (%), t × RBIAS2, t × E2, where t is study time and E (%) is sampling error at a confidence level of 95%, and efficiency ratio between method j and k (Efjk) were used. A compound of three basic distance estimators sampling method and n-tree were the best in both stands according to all criteria for density estimation. Moreover, variable area transect by Parker (g = 3) and quadrat method were the best methods for density estimation only in pure stand, while the angle order-point-centred quarter method was superior in mixed stand. Regarding to the results, we recommend the use of compound of three basic distances (BDAV3) and basic distance-nearest neighbour (BDNN2) for density estimation of P. euphratica stands in riparian forests. |
| first_indexed | 2024-04-10T08:18:53Z |
| format | Article |
| id | doaj.art-d6f35b6f8db7424db237d7187da7be14 |
| institution | Directory Open Access Journal |
| issn | 1212-4834 1805-935X |
| language | English |
| last_indexed | 2024-04-10T08:18:53Z |
| publishDate | 2018-05-01 |
| publisher | Czech Academy of Agricultural Sciences |
| record_format | Article |
| series | Journal of Forest Science |
| spelling | doaj.art-d6f35b6f8db7424db237d7187da7be142023-02-23T03:42:56ZengCzech Academy of Agricultural SciencesJournal of Forest Science1212-48341805-935X2018-05-0164523024410.17221/146/2017-JFSjfs-201805-0005Evaluation of distance methods for estimating population density in Populus euphratica Olivier natural stands (case study: Maroon riparian forests, Iran)Reza BASIRI0Mostafa MORADI1Bahman KIANI2Maryam MAASUMI BABAARABI3Department of Forestry, Faculty of Natural Resources, Behbahan Khatam Alanbia University of Technology, Behbahan, IranDepartment of Forestry, Faculty of Natural Resources, Behbahan Khatam Alanbia University of Technology, Behbahan, IranDepartment of Forestry, Faculty of Natural Resources, Yazd University, Yazd, IranDepartment of Forestry, Faculty of Natural Resources, Behbahan Khatam Alanbia University of Technology, Behbahan, IranThe aim of this study was to determine the performance of distance methods in terms of accuracy, precision, bias, consumed time and sampling efficiency in the Maroon riparian forests, Iran. 40 estimators were used to evaluate the density of Populus euphratica Olivier trees in pure and mixed stands. Fifty quadrates (30 × 30 m) were established in each stand. To evaluate the accuracy, precision, bias, consumed time and efficiency of sampling techniques, relative root mean square error - RRMSE (%), coefficient of variation - CV (%), relative bias - RBIAS (%), t × RBIAS2, t × E2, where t is study time and E (%) is sampling error at a confidence level of 95%, and efficiency ratio between method j and k (Efjk) were used. A compound of three basic distance estimators sampling method and n-tree were the best in both stands according to all criteria for density estimation. Moreover, variable area transect by Parker (g = 3) and quadrat method were the best methods for density estimation only in pure stand, while the angle order-point-centred quarter method was superior in mixed stand. Regarding to the results, we recommend the use of compound of three basic distances (BDAV3) and basic distance-nearest neighbour (BDNN2) for density estimation of P. euphratica stands in riparian forests.https://jfs.agriculturejournals.cz/artkey/jfs-201805-0005_evaluation-of-distance-methods-for-estimating-population-density-in-populus-euphratica-olivier-natural-stands.phpforest samplingaccuracyefficiencypure and mixed stands |
| spellingShingle | Reza BASIRI Mostafa MORADI Bahman KIANI Maryam MAASUMI BABAARABI Evaluation of distance methods for estimating population density in Populus euphratica Olivier natural stands (case study: Maroon riparian forests, Iran) Journal of Forest Science forest sampling accuracy efficiency pure and mixed stands |
| title | Evaluation of distance methods for estimating population density in Populus euphratica Olivier natural stands (case study: Maroon riparian forests, Iran) |
| title_full | Evaluation of distance methods for estimating population density in Populus euphratica Olivier natural stands (case study: Maroon riparian forests, Iran) |
| title_fullStr | Evaluation of distance methods for estimating population density in Populus euphratica Olivier natural stands (case study: Maroon riparian forests, Iran) |
| title_full_unstemmed | Evaluation of distance methods for estimating population density in Populus euphratica Olivier natural stands (case study: Maroon riparian forests, Iran) |
| title_short | Evaluation of distance methods for estimating population density in Populus euphratica Olivier natural stands (case study: Maroon riparian forests, Iran) |
| title_sort | evaluation of distance methods for estimating population density in populus euphratica olivier natural stands case study maroon riparian forests iran |
| topic | forest sampling accuracy efficiency pure and mixed stands |
| url | https://jfs.agriculturejournals.cz/artkey/jfs-201805-0005_evaluation-of-distance-methods-for-estimating-population-density-in-populus-euphratica-olivier-natural-stands.php |
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