N-Tree Distance Sampling vs. Fixed-Radius Plots methods for tree density estimation in central Zagros forests
N-tree Distance Sampling (NTDS) is a well-known distance sampling method which is considered as cost-and time effective compared to fixed-Radius Plots. This study was conducted across an area of 36.40 ha in Helen forest reserve in Chaharmahal and Bakhtiari Province. The study area mostly comprises o...
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| Format: | Article |
| Language: | fas |
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Research Institute of Forests and Rangelands of Iran
2014-11-01
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| Series: | تحقیقات جنگل و صنوبر ایران |
| Subjects: | |
| Online Access: | http://ijfpr.areeo.ac.ir/article_12414_d9e98d05372560e2c17000bde50cba87.pdf |
| _version_ | 1819178652382789632 |
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| author | Hamdollah Sadeghi Kaji Iman Zafarian Kobra Badfar |
| author_facet | Hamdollah Sadeghi Kaji Iman Zafarian Kobra Badfar |
| author_sort | Hamdollah Sadeghi Kaji |
| collection | DOAJ |
| description | N-tree Distance Sampling (NTDS) is a well-known distance sampling method which is considered as cost-and time effective compared to fixed-Radius Plots. This study was conducted across an area of 36.40 ha in Helen forest reserve in Chaharmahal and Bakhtiari Province. The study area mostly comprises of natural, old-growth Brant`s oak (Quercus brantii) stands. Here, the stands were first fully callipered. Two estimators of Moore and Kleinn-Vilcko sample plot methods were applied to derive the diagnostic measures of relative bias (RB) and relative root mean square error (RRMSE) for a number of 2 to 12 trees. For each estimator, 30 repeats with each encompassing 50 Sample points were selected. The results showed the fixed plot sampling (FPS) to be of higher performance in the clumpy-distributed trees within stands with 154.25 trees per ha. In addition, the Kleinn-Vilcko estimator was shown to be most efficient for N ≥ 5 trees. Due to its high error rate, the Moore estimator yet returned poor performances in density estimation across the study area. |
| first_indexed | 2024-12-22T21:45:57Z |
| format | Article |
| id | doaj.art-56015e52d8724d0da0b232e7482b0bdd |
| institution | Directory Open Access Journal |
| issn | 1735-0883 2383-1146 |
| language | fas |
| last_indexed | 2024-12-22T21:45:57Z |
| publishDate | 2014-11-01 |
| publisher | Research Institute of Forests and Rangelands of Iran |
| record_format | Article |
| series | تحقیقات جنگل و صنوبر ایران |
| spelling | doaj.art-56015e52d8724d0da0b232e7482b0bdd2022-12-21T18:11:29ZfasResearch Institute of Forests and Rangelands of Iranتحقیقات جنگل و صنوبر ایران1735-08832383-11462014-11-0122338139110.22092/ijfpr.2014.1241412414N-Tree Distance Sampling vs. Fixed-Radius Plots methods for tree density estimation in central Zagros forestsHamdollah Sadeghi Kaji0Iman Zafarian1Kobra Badfar2M. Sc. Forestry, Department of Forestry, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, I.R. Iran.M. Sc. Student, Department of Forestry, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, I.R. IranM. Sc. Forestry, Department of Forestry, Faculty of Natural Resources and Earth Sciences, Shahrekord University, Shahrekord, I.R. IranN-tree Distance Sampling (NTDS) is a well-known distance sampling method which is considered as cost-and time effective compared to fixed-Radius Plots. This study was conducted across an area of 36.40 ha in Helen forest reserve in Chaharmahal and Bakhtiari Province. The study area mostly comprises of natural, old-growth Brant`s oak (Quercus brantii) stands. Here, the stands were first fully callipered. Two estimators of Moore and Kleinn-Vilcko sample plot methods were applied to derive the diagnostic measures of relative bias (RB) and relative root mean square error (RRMSE) for a number of 2 to 12 trees. For each estimator, 30 repeats with each encompassing 50 Sample points were selected. The results showed the fixed plot sampling (FPS) to be of higher performance in the clumpy-distributed trees within stands with 154.25 trees per ha. In addition, the Kleinn-Vilcko estimator was shown to be most efficient for N ≥ 5 trees. Due to its high error rate, the Moore estimator yet returned poor performances in density estimation across the study area.http://ijfpr.areeo.ac.ir/article_12414_d9e98d05372560e2c17000bde50cba87.pdfForest inventoryN-tree distance samplingBiasfixed-radius plotsHelen reservation forest area |
| spellingShingle | Hamdollah Sadeghi Kaji Iman Zafarian Kobra Badfar N-Tree Distance Sampling vs. Fixed-Radius Plots methods for tree density estimation in central Zagros forests تحقیقات جنگل و صنوبر ایران Forest inventory N-tree distance sampling Bias fixed-radius plots Helen reservation forest area |
| title | N-Tree Distance Sampling vs. Fixed-Radius Plots methods for tree density estimation in central Zagros forests |
| title_full | N-Tree Distance Sampling vs. Fixed-Radius Plots methods for tree density estimation in central Zagros forests |
| title_fullStr | N-Tree Distance Sampling vs. Fixed-Radius Plots methods for tree density estimation in central Zagros forests |
| title_full_unstemmed | N-Tree Distance Sampling vs. Fixed-Radius Plots methods for tree density estimation in central Zagros forests |
| title_short | N-Tree Distance Sampling vs. Fixed-Radius Plots methods for tree density estimation in central Zagros forests |
| title_sort | n tree distance sampling vs fixed radius plots methods for tree density estimation in central zagros forests |
| topic | Forest inventory N-tree distance sampling Bias fixed-radius plots Helen reservation forest area |
| url | http://ijfpr.areeo.ac.ir/article_12414_d9e98d05372560e2c17000bde50cba87.pdf |
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