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应用生态学报 ›› 2026, Vol. 37 ›› Issue (6): 1739-1747.doi: 10.13287/j.1001-9332.202606.003

• 生态系统遥感与人工智能服务生态科学专栏 • 上一篇    下一篇

基于地面激光雷达的塔里木河下游胡杨枝条构型特征

再米拉·艾合麦提1, 艾萨迪拉·玉苏甫2, 玉米提·哈力克1*, 艾力甫达尔·阿尔肯1, 胡晓梅2, 青献东3, 蒋金凤3   

  1. 1新疆大学生态与环境学院/绿洲生态教育部重点实验室, 乌鲁木齐 830017;
    2北京大学城市与环境学院生态研究中心, 北京 100871;
    3若羌县林业和草原局, 新疆若羌 841800
  • 收稿日期:2026-01-26 修回日期:2026-04-27 出版日期:2026-06-18 发布日期:2026-12-18
  • 通讯作者: *E-mail: halik@xju.edu.cn
  • 作者简介:再米拉·艾合麦提, 女, 1996年生, 硕士研究生。主要从事激光雷达应用研究。E-mail: zml1005@stu.xju.edu.cn
  • 基金资助:
    国家自然科学基金项目(32260285)、国家博士后科学基金项目(2024M750066)和若羌县林业和草原局委托项目(XJMDHZ2025-077)

Branch architectural features of Populus euphratica in the lower reaches of the Tarim River using terrestrial laser scanning

Zaimila AIHEMAITI1, Asadilla YUSUP2, Ümüt HALIK1*, Alfidar ARKIN1, HU Xiaomei2, QING Xiandong3, JIANG Jinfeng3   

  1. 1College of Ecology and Environment/Ministry of Education Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi 830017, China;
    2Institute of Ecology, College of Urban and Environmental Science, Peking University, Beijing 100871, China;
    3Ruoqiang County Forestry and Grassland Bureau, Ruoqiang 841800, Xinjiang, China
  • Received:2026-01-26 Revised:2026-04-27 Online:2026-06-18 Published:2026-12-18

摘要: 枝条构型是冠层内分枝形成的空间结构,直接影响树木生长、功能和生态适应。为揭示胡杨对极端干旱环境的形态适应机制,本研究基于地面激光雷达对塔里木河下游51株胡杨进行单木尺度扫描,结合定量结构模型TreeQSM重建枝条结构,提取Ⅰ~Ⅲ级枝条几何参数,分析不同枝条级别间的异速生长关系、枝条垂直分布特征,以及构型参数(数量、长度、夹角)与树形结构参数(树高、胸径、枝下高、冠幅、冠幅面积、冠幅体积和树冠率)的相关关系。结果表明:单株胡杨Ⅰ~Ⅲ级枝条平均数量分别为9.2、68.1和567.1,长度分别为2.70、1.18和0.30 m,夹角分别为53.30°、61.33°和62.61°。随枝条级别升高,枝条数量增加,长度减小,夹角略增大。Ⅰ/Ⅱ级和Ⅱ/Ⅲ级枝条数量比例分别为1∶8和1∶9;长度比例分别为2.15∶1和4∶1。枝条主要分布于冠层3~5 m高度范围内,其中Ⅰ和Ⅲ级枝条长度随冠层高度增加呈减小趋势,Ⅱ级枝条随冠层高度的变化幅度较小。在Ⅰ~Ⅲ级枝条中,除Ⅰ级枝条数量外,其余构型参数随胸径增大而增大。胡杨Ⅰ~Ⅲ枝条数量和长度具有明显的异速生长规律及垂直分布特征,胸径是表征枝条构型的重要结构参数。本研究结果可为胡杨枝条精细结构反演与功能定量研究提供支撑。

关键词: 地面激光雷达, 定量结构模型, 树形结构参数, 胡杨

Abstract: Branch architecture is the spatial structure formed by branching within the canopy, which directly affects tree growth, function, and ecological adaptation. To reveal the morphological adaptation mechanisms of Populus euphratica to extremely arid environments, we used terrestrial laser scanning to scan 51 individual P. euphratica trees in the lower reaches of the Tarim River. We reconstructed the branch structure using the quantitative structural model TreeQSM, extracted the geometric parameters of first- to third-order branches, and analyzed the allometric relationships among different branch orders, vertical distribution patterns of branches, as well as the correlations between architectural parameters (number of branche, length, and angle), and tree structural parameters (tree height, diameter at breast height, crown base height, crown diameter, crown area, crown volume, and crown height ratio). The results showed that the mean numbers of first-, second-, and third-order branches of individual trees were 9.2, 68.1, and 567.1, respectively; the corresponding mean branch lengths were 2.70, 1.18, and 0.30 m; and the mean branch angles were 53.30°, 61.33°, and 62.61°, respectively. With increasing branch order, branch number increased, branch length decreased, and branch angle increased slightly. The ratios of branch number of first- to second-order branches and second- to third-order branches were 1:8 and 1:9, respectively, while the corresponding length ratios were 2.15:1 and 4:1. Branches were mainly distributed within the 3-5 m canopy height range. The lengths of first- and third-order branches decreased with increasing canopy height, whereas second-order branch lengths varied only slightly with canopy height. Among the first- to third-order branches, all architectural parameters except the number of first-order branches increased with increasing diameter at breast height (DBH). The numbers and lengths of first- to third-order branches in P. euphratica exhibited clear allometric growth patterns and vertical distribution characteristics, and DBH was an important structural parameter for characterizing branch architecture. These results would provide support for fine-scale structural inversion and quantitative functional studies of P. euphratica branches.

Key words: terrestrial laser scanning, quantitative structural model, tree structural parameter, Populus euphratica