A Robust Estimator of the Density of Trees Exhibiting Regular Spatial Patterns
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- Trifkovic Stanko
- Laboratory of Forest Ecosystem Science and Management (University Forests), Graduate School of Agricultural and Life Science The University of Tokyo
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- Yamamoto Hirokazu
- Graduate School of Frontier Sciences The University of Tokyo
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Abstract
The c-tree sampling method has been proposed in the past as a rapid approach to estimate forest stand parameters. However, the use of c-tree sampling is not as simple as previously thought. In order to use it, we should have a broad knowledge on statistical methodology and estimators as well as on spatial patterns and their indices. Otherwise, the use of c-tree sampling could lead into wrong conclusions. Depending on exhibited spatial patterns and the type of estimator, c-tree sampling can yield a relatively high bias. Difficulties associated with accessing information on spatial patterns have been a reason to favoring robust estimators and there was a need to derive a new estimator of tree density which would be applicable in forest plantations. Density estimates with a newly derived estimator, named to as the "GM estimator", are compared with those obtained with the (c-0.5) estimator and the (c-1) estimator. The results have shown that the GM estimator can be used in a wide range of populations exhibiting regular spatial patterns; spatial patterns ranging from highly regular to those of random. This study is a step forward in promoting the use of c-tree sampling in forestry.
Journal
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- Journal of Forest Planning
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Journal of Forest Planning 15 (2), 121-126, 2010
Japan Society of Forest Planning
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Details 詳細情報について
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- CRID
- 1390001204440797440
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- NII Article ID
- 110008799922
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- NII Book ID
- AA11059168
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- ISSN
- 21898316
- 1341562X
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed