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林业资源管理 ›› 2020›› Issue (6): 96-104.doi: 10.13466/j.cnki.lyzygl.2020.06.016

• 科学研究 • 上一篇    下一篇

抚育间伐对川西柳杉人工林生长和土壤有机碳的影响

龚映匀(), 王瑞辉(), 张斌, 刘凯利, 董凯丽, 刘俊涛, 赵苏亚, 周钰淮   

  1. 中南林业科技大学 林学院,长沙 410004
  • 收稿日期:2020-09-11 修回日期:2020-09-29 出版日期:2020-12-28 发布日期:2021-01-26
  • 通讯作者: 王瑞辉
  • 作者简介:龚映匀(1995-),女,广西来宾人,在读硕士,主要从事森林培育方面的研究工作。Email: Ivy_623598581@qq.com
  • 基金资助:
    国家林业局森林抚育成效监测国家级样地及监测体系建设项目(2018-28-11);湖南省研究生科研创新项目(CX20200706);中南林业科技大学研究生科技创新基金(CX20201005)

Effects of thinning on growth and soil organic carbon of Cryptomeria fortunei Plantation in Western Sichuan

GONG Yingyun(), WANG Ruihui(), ZHANG Bin, LIU Kaili, DONG Kaili, LIU Juntao, ZHAO Suya, ZHOU Yuhuai   

  1. College of Forestry,Central South University of Forestry and Technology,Changsha,Hunan 410004,China
  • Received:2020-09-11 Revised:2020-09-29 Online:2020-12-28 Published:2021-01-26
  • Contact: WANG Ruihui

摘要:

以川西9a生柳杉人工林为研究对象,设置对照(CK,0%)、轻度间伐(T1,21.1%)、中度间伐(T2,36.9%)、重度间伐(T3,49.0%)共4种处理,观测抚育间伐对林木生长和土壤有机碳的影响,结果表明:间伐4年后柳杉胸径、树高、蓄积量年平均生长量均为间伐>CK,两者间均存在显著差异(P<0.05),胸径年平均生长量大小排序为T3>T2>T1>CK,各处理间差异显著(P<0.05),间伐样地各处理间树高和蓄积量年平均生长量差异不显著(P>0.05);T2与T3林内径阶株数占比向更高径阶集中;0~40 cm土层有机碳含量与碳密度均值T2与T3显著大于CK(P<0.05);抚育间伐可显著降低土壤容重、提高毛管持水量,土壤全N均值T2和T3显著大于CK(P<0.05),间伐样地0~20 cm土层有机碳含量和碳密度与全N及全P之间存在极显著相关性(P<0.01)。中等间伐强度(T2)能够获得较高的生态和经济效益。

关键词: 柳杉, 抚育间伐, 林木生长, 土壤有机碳, 理化性质

Abstract:

This paper takes the 9-year-old Cryptomeria fortunei Plantation in Ya'an of Sichuan Province as the research object and sets up four kinds of thinning intensities,including control (CK,0%),light (T1,21.1%),medium (T2,36.9%) and heavy (T3,49.0%) thinning,with the aim to study the effects of thinning on tree growth and soil organic carbon.The results show that the average annual growth of DBH,height and volume of stands were thinned plot>CK after 4 years of thinning,and there was significant difference between both (P<0.05).The annual average growth of DBH was T3>T2>T1>CK,and there was significant difference between all treatments (P<0.05),but there was no significant difference between the annual average growth of height and volume of thinning sample plot (P>0.05).The number of trees in the DBH class tends to the higher DBH class concentration in T2 and T3 treatments.The mean values of soil organic carbon (SOC) content and carbon density T2 and T3 in 0-40 cm soil layer are significantly higher than CK (P<0.05).Thinning significantly reduces the soil bulk density and improves capillary water holding capacity.T2 and T3 are significantly different from CK at the mean value of soil total N (P<0.05).After thinning,the SOC content and density (0-20 cm) are significantly correlated to total N and P nutrient content of soil (P<0.01).The results show that medium thinning intensity (T2) could obtain greater ecological and economic benefits.

Key words: Cryptomeria fortunei, tending thinning, tree growth, soil organic carbon, physicochemical property

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