摘要
【目的】分析马尾松纯林改造对林分结构的影响,旨在明确最适宜的改造方式,为马尾松林结构的优化和稳定性提供参考。【方法】以建德市马尾松次生林轻度间伐无补植(LTNP)、中度间伐无补植(MTNP)、重度间伐无补植(HTNP)、中度间伐补阔(MTP)、重度间伐补阔(HTP)、皆伐补阔(CCP)后的林分为对象,探究间伐和补植两类措施对林分空间和非空间结构的影响,并对不同改造模式的林分结构进行综合评价。【结果】(1)间伐和补阔改变了林分内树种组成。随着间伐强度的增加,树种多样性呈先增后降的趋势,林分胸径结构由“单峰”向“多峰”结构转变。林分中小径阶林木占比提高,在同等间伐强度下,补阔林分内大径阶林木占比高于无补植林分。(2)CCP的角尺度显著低于其他改造林分,LTNP的混交度显著低于其他改造林分。随着间伐强度增加,开敞度逐渐增加,林层指数先增加后降低,大小比数和竞争指数逐渐减小,且在重度间伐强度下,补阔林分的大小比数和竞争指数均低于未补植林分。(3)不同改造模式的林分结构综合评价值排序为MTP>HTNP>CCP>HTP>MTNP>LTNP。【结论】马尾松中度间伐补阔(浙江樟、浙江楠)后,整体林分结构得到显著优化,对促进马尾松纯林向针阔混交和阔叶混交林演替具有重要作用。本研究为马尾松林的可持续经营提供理论参考。
[Objective]Forest structure plays a crucial role in tree growth and stability.Analyzing the impact of transformation practices on the structure of Pinus massoniana forests can provide theoretical reference for forest quality improvement and sustainable management.[Method]Different transformation treatments of secondary P.massoniana forests,including light thinning without replanting(LTNP),moderate thinning without replanting(MTNP),heavy thinning without replanting(HTNP),moderate thinning with broadleaf replanting(MTP),heavy thinning with broadleaf replanting(HTP),and clear cutting with broadleaf replanting(CCP)were selected as research objects in Jiande County,Zhejiang Province of eastern China.We explored the effects of thinning and replanting on both spatial and non-spatial stand structures,and provided comprehensive evaluation of stand structure under different transformation treatments.[Result](1)Thinning and broadleaf replanting significantly altered the forest species composition.With the increasing of thinning intensity,tree species diversity initially increased and then decreased.The DBH structure of stand changed from“single peak”to“multi-peak”.The proportion of small or medium diameter trees raised and non-replanted stands had a higher proportion than replanted stands under same thinning intensity.(2)In terms of space structure,the uniform angle index of CCP was significantly lower than that of other transformation types,and the mingling degree of LTNP was markedly lower compared with others.As thinning intensity increased,stand openness gradually increased,the forest layer index initially increased and then decreased.Additionally,both the dominance and competition index gradually decreased,and these two indexes were lower in broadleaf-replanted stands than in non-replanted ones under the heavy thinning intensity.(3)The rank of comprehensive evaluation value of stand structure was MTP>HTNP>CCP>HTP>MTNP>LTNP.[Conclusion]After moderate thinning and widening of Pinus massoniana(e.g.,Cinnamomum chekiangense,Phoebe chekiangensis),the overall forest structure was significantly optimized,which plays an important role in promoting the transition of pure Pinus massoniana forests to mixed coniferous and broadleaved forests.This study provides theoretical reference for the sustainable management of Pinus massoniana forest.
作者
周雨飞
罗超
李生
陈子熙
邵慰忠
Zhou Yufei;Luo Chao;Li Sheng;Chen Zixi;Shao Weizhong(Research Institute of Subtropical Forestry,Chinese Academy of Forestry,Hangzhou 311400,Zhejiang,China;College of Soil and Water Conservation,Southwest Forestry University,Kunming 650224,Yunnan,China;Jiande Forestry Bureau,Hangzhou 311699,Zhejiang,China)
出处
《北京林业大学学报》
北大核心
2025年第1期11-21,共11页
Journal of Beijing Forestry University
基金
世界银行贷款项目(8856-CN-JLJY3)
关键词
马尾松
间伐强度
阔叶树补植
林分结构
单位圆法
Pinus massoniana
thinning intensity
broadleaved tree replanting
stand structure
unit circle method
