文献类型：期刊文献

英文题名：Modelling the responses of crown profiles to competition in terms of different tree classes and directions in two coniferous tree species 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, State Key Lab Tree Genet & Breeding, Key Lab Tree Breeding & Cultivat, State Forestry & Grassland Adm,Res Inst Forestry, Beijing 100091, Peoples R China;[2]Shenyang Agr Univ, Coll Forestry, Shenyang 110866, Peoples R China

年份：2021

卷号：140

期号：1

起止页码：159-174

外文期刊名：EUROPEAN JOURNAL OF FOREST RESEARCH

收录：;Scopus(收录号：2-s2.0-85091242025);WOS:【SCI-EXPANDED(收录号:WOS:000571739500001)】；

基金：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. This study was financed by the National Key Research and Development Program of China (2017YFD0600401), National Natural Science Foundation of China (31901307), general project of Liaoning provincial department of education (LSNQN201901), the China Postdoctoral Science Foundation (2018M641527) and the talent introduction funding for scientific research start-up from Shenyang Agricultural University (880418014).

语种：英文

外文关键词：Crown plasticity; Neighbour competition; Horizontal crown overlapping area; Crown profile model; Larch species

摘要：Using branch data from 63L.kaempferiand 36L.gmeliniisampled trees in northeastern China, the responses of crown profiles with different tree classes (dominant, intermediate and suppressed trees) and aspects (north, east, south and west) to competition were studied. Crown displacement, defined as the distance between the centre of gravity of the crown and the stem base, was calculated for all the sampled trees to estimate the crown plasticity. The horizontal crown overlapping area (COA(H)) between sampled trees and the closest neighbouring trees was calculated to estimate the neighbour competition. A crown profile model that includes COA(H)as the explanatory variable was developed, and the effect of COA(H)on the crown profile of two tree species was analysed. The results showed that more than half of the trees had the largest crown radius and upper crown surface area on the north and east sides forL.kaempferiand on the north and south sides forL.gmelinii. The crown displacement ofL.kaempferiwas greater on the north and east sides, and that ofL.gmeliniiwas greater on the south and east sides. COA(H)had a significant effect on the crown profile model for both species. The mean square error reduction (MSER) for the crown profile model including COA(H)relative to the model without COA(H)was 1.68% and 2.10% forL.kaempferiandL.gmelinii, respectively. The COA(H)had a greater impact on the crown profile ofL.gmeliniithan that ofL.kaempferi. The inflexion point of the dominant and intermediate trees for both species was sensitive to COA(H)and gradually moved towards the crown base as the neighbour competition intensified, while the inflexion point of the suppressed tree showed a weak response to COA(H). The crown profile in the four directions was closely related to the current radial stem growth.