文献类型：期刊文献

英文题名：Developing branch diameter and length models for the planted Larix kaempferi from different latitude regions in China

作者：Tong, Yiwen[1] Chen, Dongsheng[2] Gao, Huilin[1] Xie, Yunhui[2] Liu, Jiateng[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, State Key Lab Tree Genet & Breeding, Key Lab Tree Breeding & Cultivat, State Forestry & Grassland Adm,Res Inst Forestry, Beijing 100091, Peoples R China

年份：2025

卷号：36

期号：1

外文期刊名：JOURNAL OF FORESTRY RESEARCH

收录：;EI(收录号：20252318546946);Scopus(收录号：2-s2.0-105007151101);WOS:【SCI-EXPANDED(收录号:WOS:001501151600001)】；

基金：This work is funded by the National Key Research and Development Program of China (2023YFD2200801), National Natural Science Foundation of China (No.32471864), the Science & Technology Project for Excellent Young Scholars of Liaoning Province (2024JH3/10200036), and Liao Ning Revitalization Talents Program (No. XLYC2403180). We also appreciate the thoughtful comments from the reviewers and the associate editor, which significantly improved the quality of our manuscript. We are also grateful to the staff from Dagujia forest farm, Changlinggang forest farm and Xiaolongshan forest bureau who assisted with data collection.

语种：英文

外文关键词：Branch characteristic model; Latitude regions; Climate; Competition index; Larix kaempferi

摘要：Branch length and branch diameter are important characteristics that determine wood quality and yield. Development of static branch length and diameter models by incorporating individual tree variables, site quality and competition have been widely studied, while the climate effect has rarely been reported. In this study, mixed-effects climate-sensitive branch length and diameter models were developed based on 228 sample trees of Larix kaempferi from three latitude regions in China (approximate 42 degrees N in Liaoning Province, 33 degrees N in Gansu Province, and 30 degrees N in Hubei Province). Results revealed that diameter at breast height, and crown ratio, sum of the basal areas of trees larger than the subject trees, dominant tree height, mean warmest month temperature, and summer precipitation substantially improved branch length model. Diameter at breast height, and crown ratio, ratio of the sum of DBH in sample plot to the subject tree, dominant tree height, mean warmest month temperature, and spring precipitation significantly improved branch diameter model. Compared with base model, mean square error reduction of mixed-effects branch length and diameter models were 32.9% and 44.1%, respectively. The relative contributions of covariates to branch length model were tree size (59.1%), site quality (25.7%), competition (13.5%), and climate (1.7%), and branch diameter model were tree size (57.0%), competition (21.9%), site quality (18.3%), and climate (2.8%). Relative contributions of covariates on branch length and diameter models from different latitude regions were different. Effects of competition on branch length model in Liaoning and Hubei were larger than climate, whereas climate in Gansu was larger than competition. As for branch diameter model, competition in Liaoning was larger than site quality, whereas site quality in Hubei and Gansu was larger than competition. The present study strengthened the importance of considering climate variables in developing branch length and diameter model. It is desirable to disentangle the different sources of variations in affecting branch length and diameter from different latitude regions to reduce the uncertainty in predicting branch characteristics under the condition of climate changing.