[1]王孝伟a,李澧洪b,赵维俊,等.祁连山青海云杉林冠层结构的空间异质性及其对天然更新的影响[J].山地学报,2025,(5):645-656.[doi:10.16089/j.cnki.1008-2786.000919]
 WANG Xiaoweia,LI Lihongb,ZHAO Weijun,et al.Spatial Heterogeneity of Canopy Structure in Picea crassifolia Forests of the Qilian Mountains and Its Impact on Natural Regeneration[J].Mountain Research,2025,(5):645-656.[doi:10.16089/j.cnki.1008-2786.000919]
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祁连山青海云杉林冠层结构的空间异质性及其对天然更新的影响()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2025年第5期
页码:
645-656
栏目:
山地环境
出版日期:
2025-12-30

文章信息/Info

Title:
Spatial Heterogeneity of Canopy Structure in Picea crassifolia Forests of the Qilian Mountains and Its Impact on Natural Regeneration
文章编号:
1008-2786-(2025)5-645-12
作者:
王孝伟1a李澧洪1b赵维俊2武龙庆2张瑞浩3王 平1a*
(1.甘肃农业大学 a.资源与环境学院; b.管理学院,兰州 730070; 2. 甘肃省祁连山水源涵养林研究院 祁连山森林生态系统国家定位观测研究站,甘肃 张掖 734000; 3. 河南绿博林业规划设计有限公司,郑州 450003)
Author(s):
WANG Xiaowei1a LI Lihong1b ZHAO Weijun2 WU Longqing2 ZHANG Ruihao3 WANG Ping1a*
(1. a. College of Resources and Environmental Sciences; b. School of Management, Gansu Agricultural University, Lanzhou 730070, China; 2. State Positioning Observation and Research Station of Forest Ecosystem of the Qilian Mountain, Gansu
关键词:
青海云杉林 冠层结构 空间异质性 天然更新 祁连山
Keywords:
Picea crassifolia canopy structure spatial heterogeneity natural regeneration the Qilian Mountains
分类号:
S718.5
DOI:
10.16089/j.cnki.1008-2786.000919
文献标志码:
A
摘要:
天然更新幼苗、幼树的生长与林冠层结构及其空间异质性密切相关。然而,大样地尺度下山地森林冠层结构空间异质性研究仍显不足,冠层结构对青海云杉林天然更新的影响机制尚不清晰。本研究以祁连山大野口流域动态监测样地青海云杉林(Picea crassifolia)为研究对象,系统测定冠层结构因子(叶面积指数、平均叶倾角、孔隙度)与更新特征(更新苗密度、地径、株高、冠幅),解析冠层结构空间异质性及其对天然更新的影响。研究结果表明,(1)冠层结构因子变异函数最佳理论模型均为指数型; 叶面积指数与平均叶倾角空间结构比>75%,呈强烈空间自相关,孔隙度空间结构比为50.05%,属中等自相关,方向上,叶面积指数与孔隙度呈南—北优势格局,平均叶倾角无显著方向性,空间分布上,叶面积指数与平均叶倾角呈明显斑块分布,孔隙度呈连续带状分布;(2)冠层结构因子存在显著阈值效应,叶面积指数1.34~1.64、平均叶倾角46.64°~61.01°、孔隙度25%~33%为更新苗分布的最适区间,叶面积指数与幼苗密度极显著正相关(P<0.01),但与幼树地径显著负相关(P<0.05),表明高叶面积指数可能通过降低光照抑制幼树径向生长。本研究定量刻画了冠层结构空间异质性及其与天然更新的关联,明确了影响更新的关键冠层参数优势区间,可为青海云杉林生态过程解析与自然更替促进提供科学依据。
Abstract:
The growth of naturally regenerating seedlings and saplings is closely related to forest canopy structure and its spatial heterogeneity. However, few studies had quantified canopy heterogeneity at large-plot scale in mountain forests, and the mechanisms by which canopy structure influences natural regeneration in Qinghai spruce(Picea crassifolia)forests were poorly understood.
This study systematically measured canopy structural parameters(Leaf Area Index [LAI], Mean Leaf Angle [MLA], Canopy Gap Fraction [CGF])and regeneration characteristics(seedling density, ground diameter, height, crown width)within a 10.2 ha dynamic monitoring plot of Picea crassifolia forest in the Dayekou watershed of the Qilian Mountains, China, followd by analysis of the spatial heterogeneity of canopy structure and its impact on natural regeneration.
(1)Key findings revealed spatial heterogeneity patterns: All three canopy parameters were best fitted by exponential variogram models. LAI and MLA exhibited strong spatial autocorrelation(structural ratios >75%), while CGF showed moderate autocorrelation(50.05%). Directional analysis revealed south-north anisotropy for LAI and CGF, but no directional preference for MLA. Spatially, LAI and MLA displayed patchy distributions, whereas CGF formed continuous bands.
(2)Threshold effects: Optimal regeneration occurred within specific ranges: LAI(1.34-1.64), MLA(46.64°-61.01°), and CGF(25%-33%). LAI showed highly significant positive correlation with seedling density(P<0.01)but significant negative correlation with sapling ground diameter(P<0.05), indicating that high LAI may suppress sapling radial growth through reduced light availability.
This study quantifies the spatial heterogeneity of canopy structure and its relationship with natural regeneration, identifying optimal canopy parameter ranges critical for seedling establishment. These findings provide a scientific basis for elucidating ecological processes and promoting natural succession in Picea crassifolia forests.

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备注/Memo

备注/Memo:
收稿日期(Received date): 2025- 03-27; 改回日期(Accepted date):2025-10-28
基金项目(Foundation item): 张掖市市级科技计划项目(ZY2024RC16、ZY2023RC10); 国家自然科学基金(32060247); 甘肃省自然科学基金(23JRRG0022)。[Zhangye Municipal Science and Technology Programme(ZY2024RC16、ZY2023RC10); National Natural Science Foundation of China(32060247); Natural Science Foundation of Gansu Province(23JRRG0022)]
作者简介(Biography): 王孝伟(2000-),男,甘肃和政县人,硕士研究生,主要研究方向:森林与土壤生态。[WANG Xiaowei(2000-), male, born in Hezheng, Gansu Province, M.Sc. candidate, research on forest and soil ecology] E-mail: 2027725726@qq.com
更新日期/Last Update: 2025-10-20