Taper equation and volume tables for plantation-grown red alder.

Bluhm, Andrew A.; Garber, Sean M.; Hibbs, David E.

doi:10.2737/pnw-gtr-735

Cited by 8 publications

(7 citation statements)

References 27 publications

(22 reference statements)

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“…Hal ini diduga karena pohon sengon di hutan rakyat tidak berbanir sehingga diameter pangkal mempunyai korelasi yang kuat dengan volume batang. Fungsi taper juga dapat menduga volume batang pohon dengan menerapkan teknik integral (Bluhm , 2007, Harbagung & Krisnawati, et al 2009. Kelebihan penggunaan taper dapat menentukan volume pohon pada berbagai ketinggian atau panjang yang dikehendaki, selain itu dari persamaan taper juga dapat menghasilkan angka bentuk batang.…”

Section: B Pembahasanunclassified

Model Volume Pohon Sengon Untuk Menilai Kehilangan Keuntungan Petani Hutan Rakyat

Ardelina

Tiryana

Muhdin

2015

Jur.pen.hut.tanaman

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Selling system of sengon (Paraserianthes falcataria) timber in community forests without using appropriate tree L. volume models may generate profit loss for the farmers. The objectives of this study were to develop volume models of sengon and to evaluate the profit losses of commonly practiced techniques for selling the sengon timber in community forest. The result showed that the proposed volume model can be used accurately to estimate the volume of sengon trees in the community forest by measuring tree diameters. This study confirmed that the selling system based on per log and total stand area caused profit losses of 24.99% and 32.19% respectively, to the farmers. To avoid such disadvantages, therefore the use of the proposed volume model is recommended to facilitate accurate estimation of the volume of sengon trees.

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Section: B Pembahasanunclassified

Model Volume Pohon Sengon Untuk Menilai Kehilangan Keuntungan Petani Hutan Rakyat

Ardelina

Tiryana

Muhdin

2015

Jur.pen.hut.tanaman

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“…As a result, calculating the volume of plantation grown trees with equations developed using data from natural stands would overestimate tree volume [6]. If we use these estimates in developing forest management plans, estimates of sustainable wood supply, tree and stand biomass, and carbon stocks could be at risk [7][8][9][10]. Hence, the need for distinct volume equations for plantations and natural stands [11].…”

Section: Introductionmentioning

confidence: 99%

Increasing Volumetric Prediction Accuracy—An Essential Prerequisite for End-Product Forecasting in Red Pine

Sharma

2020

Forests

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Sustainable forest management requires accurate estimates of wood volume. At present, red pine (Pinus resinosa Sol. ex Aiton) is the most widely planted conifer tree species in southern Ontario, Canada. Therefore, inside and outside bark volume equations were developed for red pine trees grown in plantations. One hundred and fifty red pine trees were sampled from 30 even-aged plantations from across Ontario, Canada. Height-diameter pairs along the boles of sampled trees used to calculate stem volumes were obtained from stem analysis. Equations fitted to the data were a combined variable, modified combined variable, and modified form of dimensionally compatible volume equations. These equations were compared for their goodness-of-fit statistics, logical consistency, and predictive accuracy. The goodness-of-fit characteristics for all three equations were comparable for both inside and outside bark volumes. However, the estimated values for the intercept for the modified form of the dimensionally compatible and modified combined variable volume equations were negative and nonsignificant. The combined variable volume equation resulted in logically consistent parameter estimates in the presence of random effects parameters. Therefore, this equation was selected as the inside and outside bark volume equation for red pine trees grown in plantations. A nonlinear mixed-effects modeling approach was applied in fitting the final volume equation that included a weight (power function) to address heteroscedasticity. The equations developed here can be used to calculate inside and outside bark volumes of red pine plantations in boreal forests in Eastern Canada. These equations would require both diameter at breast height (DBH) and total height values in meters.

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“…Differences in stand conditions affect tree form and thus tree volume (Bluhm et al 2007). Accordingly, different model forms and fitting techniques have been used in developing volume and taper models in the past in different kinds of stands.…”

Section: Introductionmentioning

confidence: 99%

Estimating upper stem diameters and volume of Douglas-fir and Western hemlock trees in the Pacific northwest

2018

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Background: Volume and taper equations are essential for obtaining estimates of total and merchantable stem volume. Taper functions provide advantages to merchantable volume equations because they estimate diameter inside or outside bark at specific heights on the stem, enabling the estimation of total and merchantable stem volume, volume of individual logs, and a height at a given diameter. Methods: Using data collected from 1218 trees (1093 Douglas-fir (Pseudotsuga menziesii (Mirbel) Franco) and 125 western hemlock (Tsuga heterophylla)), we evaluated the performance of one simple polynomial function and four variable-exponent taper functions in predicting upper stem diameter. Sample trees were collected from different parts of the states of Oregon, Washington, and California. We compared inside-bark volume estimates obtained from the selected taper equation with estimates obtained from a simple logarithmic volume equation for the data obtained in this study and the equations used by the Forest Inventory and Analysis program in the Pacific Northwest (FIA-PNW) in the state of California and western half of the states of Oregon and Washington. Results: Variable exponent taper equations were generally better than the simple polynomial taper equations. The FIA-PNW volume equations performed fairly well but volume equations with fewer parameters fitted in this study provided comparable results. The RMSE obtained from taper-based volume estimates were also comparable with the RMSE of the FIA-PNW volume equations for Douglas-fir and western hemlock trees respectively. Conclusions: The taper equations fitted in this study provide added benefit to the users over the FIA-PNW volume equations by enabling the users to predict diameter at any height, height to a given diameter, and merchantable volume in addition to cubic volume including top and stump (CVTS) of Douglas-fir and western hemlock trees in the Pacific Northwest. The findings of this study also give more confidence to the users of FIA-PNW volume equations.

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Taper equation and volume tables for plantation-grown red alder.

Cited by 8 publications

References 27 publications

Model Volume Pohon Sengon Untuk Menilai Kehilangan Keuntungan Petani Hutan Rakyat

Model Volume Pohon Sengon Untuk Menilai Kehilangan Keuntungan Petani Hutan Rakyat

Increasing Volumetric Prediction Accuracy—An Essential Prerequisite for End-Product Forecasting in Red Pine

Estimating upper stem diameters and volume of Douglas-fir and Western hemlock trees in the Pacific northwest

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