A Robust Estimator of the Density of Trees Exhibiting Regular Spatial Patterns

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概要

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• 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.

著者

• Yamamoto Hirokazu

  Graduate School Of Frontier Sciences The University Of Tokyo

• Yamamoto Hirokazu

  Univ. Tokyo Chiba Jpn

• Yamamoto Hirokazu

  Graduate School Of Agricultural And Life Sciences The University Of Tokyo

• Trifkovic Stanko

  Laboratory of Forest Ecosystem Science and Management (University Forests), Graduate School of Agricultural and Life Science The University of Tokyo

• Trifkovic Stanko

  Laboratory Of Forest Ecosystem Science And Management (university Forests) Graduate School Of Agricultural And Life Science The University Of Tokyo

関連論文

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• Estimation of Stand Attributes in Cryptomeria japonica and Chamaecyparis obtusa Stands from Single Tree Detection using Small-Footprint Airborne LiDAR Data(Silvilaser)
• Estimating of Timber Resources from Large Diameter and Long Materials Used for Wooden Cultural Buildings(Multipurpose Forest Management)
• Forest Resources Management to Support the Japan's "Culture of Wood"(Multipurpose Forest Management)
• A Robust Estimator of the Density of Trees Exhibiting Regular Spatial Patterns

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