文献类型：期刊文献

英文题名：Development of a stem taper equation and modelling the effect of stand density on taper for Chinese fir plantations in Southern China

作者：Duan, Aiguo[1,2] Zhang, Sensen[1] Zhang, Xiongqing[1,2] Zhang, Jianguo[1,2]

第一作者：Duan, Aiguo;段爱国

通信作者：Duan, AG[1];Zhang, JG[1];Duan, AG[2];Zhang, JG[2]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, Key Lab Tree Breeding & Cultivat State Forestry A, State Key Lab Tree Genet & Breeding, Beijing, Peoples R China;[2]Nanjing Forestry Univ, Collaborat Innovat Ctr Sustainable Forestry South, Nanjing, Jiangsu, Peoples R China

年份：2016

卷号：4

期号：4

外文期刊名：PEERJ

收录：;Scopus(收录号：2-s2.0-84966318900);WOS:【SCI-EXPANDED(收录号:WOS:000374749000005)】；

基金：The Scientific and Technological Task in China (Grant No. 2015BAD09B01, 2012BAD01B01), the National Natural Science Foundation of China (Grant No. 31370629) and the Collaborative Innovation Center of Sustaintable Forestry in Southern China of Nanjing Forestry University supported this study. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

语种：英文

外文关键词：Taper equation; Stand density; Tree form; Chinese fir; Modelling

摘要：Chinese fir (Cunninghamia lanceolata) is the most important commercial tree species in southern China. The objective of this study was to develop a variable taper equation for Chinese fir, and to quantify the effects of stand planting density on stem taper in Chinese fir. Five equations were fitted or evaluated using the diameter-eig t data from 293 Chinese fir trees sampled from stands with four different densities in Fenyi County Jiangxi Province, in southern China. A total of 183 trees were randomly selected for the model developrnent, with the remaining 110 trees used for model evaluation. The results show that the Kozak's, S arma/Oderwald, Sharma/Zhang and modified Brink's equations are superior to the Pain/Boyer equation in terms of the fitting and validation statistics, and the modified Brink's and Sharma/Zhang equations should be recommended for use as taper equations for Chinese fir because of their high accuracy and variable exponent. The relationships between some parameters of the three selected equations and stand planting densities can be built by adopting some simple mathematical fiinctions to examine the effects of stand planting density, on tree taper. The modelling and prediction precision of the three taper equations were compared with or without incorporation of the stand density variable. The predictive accuracy of the model was improved by including the stand density variable and the mean absolute bias of the modified Brink's and Sharma/Zhang equations with a stand density variable were all below 1.0 cm in the study area. The modelling results showed that the trees have larger butt diameters and more taper when stand density was lower than at higher stand density.