文献类型：期刊文献

英文题名：Modelling outer- and inner-crown profiles based on tree status and cardinal directions in relation to competition for Larix kaempferi plantations in northeastern China

作者：Gao, Huilin[1,2] Chen, Dongsheng[1] Sun, Xiaomei[1] Zhang, Shougong[1]

第一作者：Gao, Huilin

通信作者：Sun, XM[1];Zhang, SG[1]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Tree Genet & Breeding, Beijing 100091, Peoples R China;[2]Shenyang Agr Univ, Coll Forestry, Shenyang 110866, Liaoning, Peoples R China

年份：2019

卷号：49

期号：11

起止页码：1412-1424

外文期刊名：CANADIAN JOURNAL OF FOREST RESEARCH

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000494260600009)】；

基金：This study was financed by the Key Program of National Natural Science Foundation of China (project Nos. 31430017 and 31901307) and the China Postdoctoral Science Foundation (project No. 2018M641527). We are deeply indebted to the other researchers who contributed to this project. The authors also thank the PhD students who have worked hard in data collection. The authors declare that they have no conflicts of interest.

语种：英文

外文关键词：crown profile; competition index; nonlinear marginal regression; nonparametric boundary regression; Larix kaempferi

摘要：Using the branch data from 90 sample trees, we developed novel models of outer- and inner-crown profiles for the northern, eastern, southern, and western sides of planted Larix kaempferi (Lam.) Carriere trees in northeastern China via the integration of competition indices (CIs) based on nonlinear marginal regression (NMR). We also used nonparametric boundary regression (NBR) to model the crown-profile boundary. The largest crown radius and inflection points of sample trees were calculated using NBR and NMR. We determined that the CIs of the ratio of the diameter of the subject tree to the quadratic mean diameter (CI3) and ratio of the basal area of the subject tree to the mean basal area of the stand (CI5) were the best distance-independent CIs for incorporation into the models of outer- and inner-crown profiles, respectively. The CIs showed a significant effect on the outer-crown profile in all four directions for dominant, intermediate, and suppressed trees but did not show a significant effect on inner-crown profile. The outer-crown radius increased and inner-crown radius decreased with increasing CI3 and CI5, respectively. The crown profile on the northern side was the largest, which conformed to the regularity in the mean current increment of the sampled branches.