欢迎访问林业科学,今天是

林业科学 ›› 2023, Vol. 59 ›› Issue (6): 1-11.doi: 10.11707/j.1001-7488.LYKX20220508

• • 上一篇    下一篇

适度间伐对日本落叶松人工林生物多样性和土壤多功能性影响

王宏星,孙晓梅,陈东升,吴春燕,张守攻*   

  1. 林木遗传育种国家重点实验室 国家林业和草原局林木培育重点实验室 中国林业科学研究院林业研究所 北京 100091
  • 收稿日期:2022-07-29 接受日期:2023-05-09 出版日期:2023-06-25 发布日期:2023-08-08
  • 通讯作者: 张守攻
  • 基金资助:
    中央级公益性科研院所基本科研业务费专项资金(CAFYBB2022ZC001, LYSZX202002);国家自然科学基金面上项目(31971652)

Effects of Moderate Thinning on Biological Diversity and Soil Multifunctionality in Larix kaempferi Plantations

Hongxing Wang,Xiaomei Sun,Dongsheng Chen,Chunyan Wu,Shougong Zhang*   

  1. State Key Laboratory of Tree Genetics and Breeding Key Laboratory of Tree Breeding and Cultivation of National Forestry and Grassland Administration Research Institute of Forestry, CAF Beijing 100091
  • Received:2022-07-29 Accepted:2023-05-09 Online:2023-06-25 Published:2023-08-08
  • Contact: Shougong Zhang

摘要:

目的: 探讨间伐强度对日本落叶松人工林林下植被、土壤微生物群落结构和土壤多功能性的影响,为其合理经营提供科学依据。方法: 以辽宁省东部山区16年生日本落叶松人工林为研究对象,于2019年4月设置对照组(2 000株·hm?2,郁闭度0.89)、间伐强度30%(保留1 404株·hm?2,郁闭度0.78)、间伐强度45%(保留1 106株·hm?2,郁闭度0.69)3种间伐强度,2020年7月生长旺季调查林下植被特征,并在春、夏和秋季进行土壤取样,测定土壤理化性质、酶活性、土壤真菌和细菌多样性与群落组成,以及基于15个与碳、氮、磷循环相关的土壤理化性质和酶活性指标计算土壤多功能性。结果: 与对照组相比,45%间伐强度可显著提高林下植物被多样性、土壤有效养分含量、酶活性、真菌多样性,增加土壤多功能性,且对土壤性质的影响在夏季表现尤为明显;30%间伐强度显著降低春、夏、季的土壤多功能性,对林下植被生物量和多样性影响不显著;2) 间伐显著影响土壤真菌优势门和纲的相对丰度,对细菌优势门和纲的相对丰度影响不显著;45%间伐强度显著增加夏季子囊菌门的相对丰度,显著降低夏、秋季担子菌门的相对丰度;3) 相关分析显示,林下植被生物量和多样性、真菌丰富度与土壤多功能性显著正相关;结构方程模型结果表明,45%间伐强度对土壤多功能性具有显著而直接的正效应,并通过改变真菌群落组成产生间接的正效应。结论: 日本落叶松人工林土壤真菌群落更易受间伐影响,细菌群落主要受季节影响;45%间伐强度(郁闭度0.69)较30%间伐强度(郁闭度0.78)更有利于维持16年生日本落叶松人工林林下植被生长发育、真菌多样性和土壤多功能性。

关键词: 间伐, 季节, 林下植被, 土壤多功能性, 土壤微生物

Abstract:

Objective: This study aims to explore the effects of thinning intensity on understory vegetation, soil microbial community and multifunctionality in a Larix kaempferi (Japanese larch) plantation, so as to provide a theoretical basis for sustainable management of plantations. Method: A 16-year-old Japanese larch plantation in the montane region of eastern Liaoning Province was targeted, and three thinning intensities in standard plots were conducted in April 2019, namely control (2 000 trees·hm?2; canopy density 0.89); 30% thinning (1 404 trees·hm?2; canopy density 0.78), 45% thinning (1 106 trees·hm?2; canopy density 0.69). In July 2020, understory vegetation characteristics were investigated at the peak growth season, and soil samples were collected in spring, summer and autumn. Soil physicochemical properties, enzyme activities, and microbial community (fungi and bacteria) diversity and composition were measured. Soil multifunctionality was calculated based on 15 soil physicochemical properties and enzyme activities parameters related to C, N and P cycles. Result: 1) Compared to the control, 45% thinning intensity significantly increased the diversity of understory vegetation, soil available nutrients, enzyme activity and fungal diversity as well as soil multifunctionality and the impact on soil properties was particularly pronounced in summer. The 30% thinning intensity significantly decreased soil multifunctionality in spring and summer, and had no significant impact on understory vegetation. 2) Thinning significantly affected the relative abundance of dominant phyla and classes of soil fungi, but had no significant influence on the relative abundance of dominant phyla and classes of soil bacteria. Especially, 45% thinning intensity significantly increased the relative abundance of Ascomycota in summer and significantly decreased the relative abundance of Basidiomycota in summer and autumn. The relative abundance of dominant phyla and classes of bacteria was mainly affected by season. 3) Correlation analysis showed that there were significant and positive correlations between the biomass and diversity of understory vegetation, fungal richness and soil multifunctionality. Structural equation model indicated that 45% thinning intensity had a significant direct and positive effect on soil multifunctionality, and had an indirect positive effect on soil multifunctionality by changing fungal community composition. Conclusion: Soil fungal community in Japanese larch plantation is more susceptible to thinning, while bacterial community is significantly affected by season. The 45% thinning intensity (canopy density 0.69) is more conducive to maintain the growth and development of understory vegetation, fungal diversity and soil multifunctionality than the 30% thinning intensity (canopy density 0.78) in 16-year-old Japanese larch plantation.

Key words: thinning, season, understory vegetation, soil multifunctionality, soil microbial community

中图分类号: