文献类型：期刊文献

英文题名：A comprehensive crown profile model of planted Larix kaempferi from different latitudes in China

作者：Tong, Yiwen[1] Chen, Dongsheng[2] Sun, Xiaomei[2] Gao, Huilin[1]

第一作者：Tong, Yiwen

通信作者：Gao, HL[1]

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

年份：2024

卷号：143

期号：5

起止页码：1429-1446

外文期刊名：EUROPEAN JOURNAL OF FOREST RESEARCH

收录：;Scopus(收录号：2-s2.0-85195362689);WOS:【SCI-EXPANDED(收录号:WOS:001243292100001)】；

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 (2023YFD2200801), and the research project on technological innovation and development from National Forestry and Grassland Administration (No: 2023132015).

语种：英文

外文关键词：Outer-crown profile model; Inner-crown profile model; Climate; Competition index; Larix kaempferi

摘要：Crown profile has been the key indicator for assessing tree vigor and has many potential applications in forest growth modelling and forest management. Based on the measurement of the branches for a total of 156 Larix kaempferi individual trees from Liaoning province, Hubei province and Gansu provinces, we developed a nonlinear mixed effects outer-and inner-crown profile model, which included tree variables, climate variables, competition indices, and site quality. The effects of dominant tree height (H-dom), competition indices and climate variables on crown modelling were analyzed. The results showed that climate, competition and H-dom all had significant effects on the outer-and inner-crown profile. Among them, the ratio of DBH of the subject tree to the DBH of the largest individual tree in the stand (DDM) is the most significant competition index. The outer-crown radius increased with the increasing of DDM, and the inner-crown radius decreased with the increasing of DDM. H-dom also showed significant effect on outer-and inner-crown radius. Mean warmest month temperature (MWMT) were selected as the best climate variable to incorporate into the outer-crown profile model, and mean coldest month temperature (MCMT) for the inner-crown profile model. The regularity for the difference of outer-crown radius among three regions was Gansu > Liaoning > Hubei and Liaoning > Hubei for the inner-crown radius. Compared with base model, mean square error reduction (MSER) of the nonlinear mixed effect outer-crown profile model was 22.3% and the nonlinear mixed effect inner-crown profile model was 37.5% compared to the base model. The relative contributions of each variable to the outer-crown profile were DBH (40.05%), site quality (31.11%), CR (16.16%), competition (5.83%), HD (5.47%), and MWMT (1.38%), and the relative contributions to the inner-crown profile were MCMT (40.79%), DBH (32.32%), site quality (25.68%), and competition (1.21%).