摘要
基于孟家岗林场5块不同间伐强度[对照组(CK)、4次低强度间伐(T_(1))、2次中强度加1次低强度间伐(T_(2))、2次中强度间伐(T_(3))和2次高强度间伐(T_(4))]的长白落叶松人工林固定样地,获取地基激光扫描(TLS)点云数据,验证利用TLS量化人工林中单木Hegyi竞争指数的可行性,分析间伐强度对长白落叶松基于树干和树冠竞争的影响。结果表明:抚育间伐处理降低了长白落叶松间的竞争,与对照样地相比,T_(1)、T_(2)、T_(3)和T_(4)样地的平均竞争指数分别下降0.5%~10.7%、15.1%~20.6%、28.6%~34.8%和39.2%~47.9%。基于树干的竞争指数(胸径、树高)在不同间伐处理间均存在显著差异;基于树冠体积和树冠表面积的竞争指数在不同间伐处理间存在显著差异;而基于最大树冠直径和树冠投影面积的竞争指数在对照和低强度间伐处理间的差异不显著,在其他处理间差异均显著。综上,基于TLS点云可以量化单木树干和树冠竞争,基于树冠体积和树冠表面积的竞争指数可以反映抚育间伐林分内的竞争关系。
We acquired the terrestrial laser scanning(TLS)point cloud data of five permanent plots of Larix olgensis plantations with different thinning intensities[control(CK),four low-intensity thinning treatments(T_(1)),two medium-intensity plus one low-intensity thinning treatments(T_(2)),two medium-intensity thinning treatments(T_(3)),and two high-intensity thinning treatments(T_(4))]in the Mengjiagang Forest Farm.Then,we verified the use of TLS to quantify the individual tree Hegyi competition index(CI)in plantations and analyzed the effect of thinning intensities on stem and crown competition in L.olgensis.The results showed that the thinning treatment reduced the competition among L.olgensis trees,with the average competition indices of T_(1),T_(2),T_(3)and T_(4)plots being decreased by 0.5%-10.7%,15.1%-20.6%,28.6%-34.8%and 39.2%-47.9%,respectively.There were significant differences in the stem-based CI(diameter at breast height,tree height)among different treatments.CI based on crown volume and crown surface area showed significant differences among the thinning treatments.In contrast,the differences in CI based on maximum crown diameter and crown projection area were not significant between the control and low-intensity thinning treatments,though differed significantly between all other treatments.In summary,TLS-based point clouds could quantify individual tree stem and crown competition,and CI based on crown volume and surface area could effectively reflect the competitive relationships within thinned forest stands.
作者
王帆
贾炜玮
李凤日
唐依人
张颖
WANG Fan;JIA Weiwei;LI Fengri;TANG Yiren;ZHANG Ying(School of Forestry,Northeast Forestry University,Harbin 150040,China;Ministry of Education Key Laboratory of Sustainable Forest Ecosystem Management,Northeast Forestry University,Harbin 150040,China;Baicheng Forestry and Grassland Bureau,Baicheng 137000,Jilin,China;State-Owned Forestry Farms Directly under the Harbin Forestry and Grassland Bureau,Harbin 150040,China)
出处
《应用生态学报》
北大核心
2025年第5期1309-1318,共10页
Chinese Journal of Applied Ecology
基金
国家重点研发计划项目(2023YFD2200802)
哈尔滨市林业和草原局直属林场全国森林可持续经营试点技术服务项目(HFW240100013,HFW240100028)资助。
关键词
长白落叶松人工林
地基激光雷达
间伐
Hegyi竞争指数
树干竞争
树冠竞争
Larix olgensis plantation
terrestrial laser scanning(TLS)
thinning
Hegyi competition index
stem competition
crown competition
作者简介
通信作者:贾炜玮,E-mail:jiaww2002@163.com;王帆,男,1997年生,硕士研究生。主要从事林分生长与收获模型研究。E-mail:764548132@qq.com。
