scholarly journals Compatible System for Predicting Total and Merchantable Stem Volume over and under Bark, Branch Volume and Whole-Tree Volume of Pine Species

Forests ◽  
2017 ◽  
Vol 8 (11) ◽  
pp. 417 ◽  
Author(s):  
José Corral-Rivas ◽  
Daniel Vega-Nieva ◽  
Roque Rodríguez-Soalleiro ◽  
Carlos López-Sánchez ◽  
Christian Wehenkel ◽  
...  
Keyword(s):  
Stem Volume ◽  
Compatible System ◽  
Whole Tree ◽  
Pine Species

Predicting branch to bole volume scaling relationships from varying centroids of tree bole volume

2010 ◽  
Vol 40 (12) ◽  
pp. 2278-2289 ◽  
Author(s):  
David W. MacFarlane
Keyword(s):  
Da Vinci ◽  
Leonardo Da Vinci ◽  
Stem Volume ◽  
Tree Model ◽  
Centroid Method ◽  
True Value ◽  
Hardwood Trees ◽  
Stand Conditions ◽  
Whole Tree ◽  
Branch Wood

A novel “varying-centroid” method is presented for predicting whole-tree, aboveground stem volume (i.e., bole plus branch volume) to bole volume ratios from changes in the centroid of tree bole volume associated with branching of the bole. The method was derived from a simple fractal-like tree model based on a conceptualization of tree branching architecture by Leonardo da Vinci. The method recognizes that the centroid of bole volume (the point at which one half of bole volume is above and one half is below) is always lower than the centroid of whole-tree volume and that shifts in the centroid of bole volume should be predictably related to the size of a tree’s crown. The method assumes that branch-displaced bole volume profiles can be compared with reference bole profiles that are not significantly influenced by branching, at the centroid of bole volume, and that the magnitude of bole centroid displacement predicts the branch volume necessary to cause it. When the method was applied to hardwood trees representing diverse species, sizes, and stand conditions across Michigan, the centroid of bole volume was found to vary predictably with measurable tree crown attributes and bole plus branch wood to bole wood volume ratios were generally predicted within 10% of the true value using the new method.

scholarly journals Compatible Taper and Stem Volume Equations for Five Pine Species in Mixed-Species Forests in Mexico

2019 ◽  
Vol 65 (5) ◽  
pp. 602-613
Author(s):  
Gerónimo Quiñonez-Barraza ◽  
Dehai Zhao ◽  
Héctor Manuel De los Santos-Posadas
Keyword(s):  
Volume Ratio ◽  
Stem Volume ◽  
Volume Data ◽  
Stem Height ◽  
White Pine ◽  
Mixed Species ◽  
Cumulative Volume ◽  
Volume Equations ◽  
Better Than ◽  
Pine Species

Abstract Ten systems of compatible taper and outside-bark volume equations derived from upper-height-based volume ratio equations were compared with a used segmented-stem system of compatible taper and volume equations. All the systems were simultaneously fitted to cumulative volume data and taper data for Arizona pine, Aztec pine, Durango pine, Mexican white pine, and Smooth-leaved pine species in naturally regenerated mixed-species forests in Mexico. The systems derived from volume ratio equations performed better than the segmented-stem system for most species. The resultant top systems might be easier to implement than the segmented-stem system for predicting upper-stem height, upper-stem diameter, merchantable volume, and total stem volume for considered species.

scholarly journals Compatible Taper and Volume Systems Based on Volume Ratio Models for Four Pine Species in Oaxaca Mexico

Forests ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 145
Author(s):  
Albert Castillo-López ◽  
Gerónimo Quiñonez-Barraza ◽  
Ulises Diéguez-Aranda ◽  
José Javier Corral-Rivas
Keyword(s):  
Sustainable Forest Management ◽  
Essential Element ◽  
Volume Ratio ◽  
Stem Volume ◽  
Mixed Species ◽  
Commercial Species ◽  
Pinus Pseudostrobus ◽  
Total Tree ◽  
Volume Equations ◽  
Pine Species

Estimating tree volume components is an essential element in sustainable forest management. Compatible taper and merchantable outside-bark volume systems based on volume ratio models were globally fitted to four pine species (reduced models) with the aim to select the best reduced model and to fit it with dummy variables and additive effects using Pinus pseudostrobus Lindl as a base species. The study was carried out in the northern mountains of Oaxaca, Mexico. To fit the taper, merchantable volume, stem volume, branch volume, and total tree volume (stem volume and branch volume) equations, a taper dataset of 222, 230, 245, and 333 trees of Pinus douglasiana Martínez (Pd), Pinus oaxacana Mirov (Po), Pinus patula Schltd (Pp), and Pinus pseudostrobus Lindl (Pps), respectively, was used. In general, the compatible systems explained more than 97% in the observed variability for the four studied components: outside-bark diameter (d), merchantable outside-bark volume (Vm), stem outside-bark volume (Vs), and total tree volume (Vt). Alternatively, more than 52% of the observed variability for branch volume (Vb) was also explained. The developed compatible systems based on volume ratio models are a simple and consistent alternative for estimating the outside-bark diameter and variable outside-bark volume, as well as the components of commercial species for uneven-age and mixed-species forests in Oaxaca, Mexico.

Red Heart Disease in Pines Caused by Porodaedalea (Phellinus) pini in Florida

EDIS ◽  
2020 ◽  
Vol 2020 (1) ◽  
pp. 3
Author(s):  
Yin-Tse Huang ◽  
Jeffrey Eickwort ◽  
Jiri Hulcr
Keyword(s):  
Heart Disease ◽  
Forest Resources ◽  
Fact Sheet ◽  
Cavity Nesting ◽  
Pine Species

All pine species in Florida are susceptible to red heart disease. The disease can decrease timber value and weaken trees, making them threats to people and property. In forests, however, the same disease can be beneficial to cavity-nesting animals like red-cockaded woodpeckers. This 3-page fact sheet written by Yin-Tse Huang, Jeffrey Eickwort, and Jiri Hulcr and published by the UF/IFAS School of Forest Resources and Conservation describes the disease and provides some tips to manage it in areas where it could cause problems for people.http://edis.ifas.ufl.edu/fr425

The Estimation of Stem Volume for Pinus thunbergii by Coast using Kozak’s Stem Taper Model in Korea

2017 ◽  
Vol 29 (4) ◽  
pp. 225-244 ◽  
Author(s):  
Yeongmo Son ◽  
Jinteak Kang ◽  
Juhyeon Jeon ◽  
Chiung Ko
Keyword(s):  
Pinus Thunbergii ◽  
Stem Volume ◽  
Stem Taper ◽  
Taper Model

Spatio-temporal approach for identification of critical conservation areas: a case study with two pine species from a threatened temperate forest in Mexico

2019 ◽  
Vol 28 (7) ◽  
pp. 1863-1883 ◽  
Author(s):  
Agustín Molina Sánchez ◽  
Patricia Delgado ◽  
Antonio González-Rodríguez ◽  
Clementina González ◽  
A. Francisco Gómez-Tagle Rojas ◽  
...  
Keyword(s):  
Temperate Forest ◽  
Conservation Areas ◽  
Spatio Temporal ◽  
Pine Species

scholarly journals Cerebellum and brain stem volume loss in relapsing remission multiple sclerosis by MRI volumetry: relation to neurological disability score and number of relapses

2021 ◽  
Vol 52 (1) ◽  
Author(s):  
Magdy Elzayady ◽  
Naglaa Lotfy Debees ◽  
Mohamed Khalil ◽  
Mohammed Mahmoud Dawoud
Keyword(s):  
Brain Stem ◽  
Tissue Loss ◽  
Cerebellar Hemisphere ◽  
Stem Volume ◽  
Volume Loss ◽  
Neurological Disability ◽  
Disability Score ◽  
Brain Volume Loss ◽  
Significant Difference ◽  
Mri Volumetry

Abstract Background MRI is the method of choice in the diagnosis of MS as well as in monitoring the disease activity. MRI volumetry is used to assess whole or regional brain volume loss which reflects neurodegenerative aspect of the disease and plays an important role in all stages of disease. The aim of this work is to study MRI volumetry in the evaluation of cerebellum and brain stem volume loss in RRMS patients and its correlation with neurological disability score and number of relapses. Results Volumes of whole brainstem, medulla, and pons showed a significant decrease in RRMS cases compared to controls (p < 0.05). Brainstem volume had a mean volume of 22.17 and 25.09 cm3 in cases and controls, respectively. However, midbrain volume showed no significant difference between cases and controls (p = 0.134). Volume of left cerebellar cortex showed a significant decrease in RRMS cases compared to controls (p < 0.001). It had mean volumes of 81.64 and 92.14 ml in cases and controls, respectively, at left cerebellar hemisphere, while right cerebellar hemisphere cortex volumes were 80.37 and 91.97 ml in cases and controls, respectively. Cerebellar white matter showed no significant volume decrease in cases and controls. Conclusion Volumetric MR imaging is an important tool for quantifying the MS disease, assesses MS activity, progression, and tissue loss. The degree and the pattern of atrophy on MRI images correlate significantly with the neurological disability score and number of relapses.

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