Next Article in Journal
The Influence of Deforestation on Land Surface Temperature—A Case Study of Perak and Kedah, Malaysia
Previous Article in Journal
Effect of Natural Drying Methods on Moisture Content and Mass Change of Scots Pine Roundwood
Previous Article in Special Issue
Evaluation of Selected Accelerated Above-Ground Durability Testing Methods for Wood after Ten Years Exposure
Open AccessArticle

A Comparative Evaluation of Three Stem Profile Equations for Three Precious Tree Species in Southern China

by Jun Jiang 1,*, Jie Li 2, Lifeng Pang 3,* and Angang Ming 4,5
1
Research Center of Forest Management Engineering of State Forestry and Grassland Administration, Beijing Forestry University, Beijing 100083, China
2
College of Landscape Architecture, Shangqiu University, Shangqiu 476113, China
3
Key Laboratory of Forest Management and Growth Modelling, NFGA, Institute of Forest Resource Information Techniques, Chinese Academy of Forestry, Beijing 100091, China
4
Guangxi Youyiguan Forest Ecosystem Research Station, Pingxiang 532600, China
5
Experiment Center of Tropical Forestry, Chinese Academy of Forestry, Pingxiang 532600, China
*
Authors to whom correspondence should be addressed.
Forests 2020, 11(6), 669; https://doi.org/10.3390/f11060669
Received: 24 April 2020 / Revised: 25 May 2020 / Accepted: 4 June 2020 / Published: 11 June 2020
(This article belongs to the Special Issue Modeling the Performance of Wood and Wood Products)
Accurately describing the stem curve of precious tree species and estimating the quantity of various types of wood and their volume in the tropics can provide technical support for reasonable bucking. This study utilized Erythrophleum fordii, Castanopsis hystrix and Tectona grandis as study objects. Forty replicates of each species were used for a total of 120 individual trees. Their tape equations were constructed using simple tape equations, segmented taper equations and variable form taper equations. Statistical indicators were utilized to determine the best taper equation for the three types of precious tree species. A number of methods were compared and analyzed, including the index of correlation, the residual sum of squares, the mean prediction error, the variance of prediction errors and the root mean square error. Finally, a preliminary quantitative analysis was conducted to determine the trends of these three types of tree species. The result shows that the precision of the three predictions developed for each species is high, and, in particular, the segmented taper equations with optimized algorithms is the best. The tendency of the three species to vary was shown to be the highest for T. grandis in the range of 0.0 to 0.8 for its relative height, followed by E. fordii, while the variation of C. hystrix was the smallest. However, in the range of 0.8 to 1.0 relative height, the variation of Castanopsis hystrix was the largest, and the variation of both E. fordii and T. grandis were almost the same. Therefore, the segmented taper equations with optimization algorithms was recommended to fit the three types of tree species in the tropics. These types of equations can be used to estimate the stumpage and timber quantity and as a guide reasonable bucking for these three species. View Full-Text
Keywords: precious tree species; stem curve; simple taper equation; segmented taper equation; variable exponent equation precious tree species; stem curve; simple taper equation; segmented taper equation; variable exponent equation
Show Figures

Figure 1

MDPI and ACS Style

Jiang, J.; Li, J.; Pang, L.; Ming, A. A Comparative Evaluation of Three Stem Profile Equations for Three Precious Tree Species in Southern China. Forests 2020, 11, 669.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop