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Forest and Grassland Resources Research >

2024 , Vol. 0 >Issue 6: 35 - 44

DOI: https://doi.org/10.13466/j.cnki.lczyyj.2024.06.005

Scientific Research

The Impact of Fire Severity on Soil Microbial Biomass and Community Composition in Larix gmelinii Forests

  • Guang YANG ,
  • Xinyu WANG ,
  • Yunjia MA ,
  • Zhaoyan LIU ,
  • Lixuan WANG ,
  • Jian SUN
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  • 1. School of Forestry,Northeast Forestry University,Harbin 150040,China
    2. Natural Resources Rights and Interests Investigation and Monitoring InstituteofHeilongjiang Province,Harbin 150040,China

Received date: 2024-11-08

  Revised date: 2024-12-10

  Online published: 2025-04-18

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Abstract

Understanding the response of soil microbial communities to fire severity in flat and sloping forests,as well as the factors influencing microbial composition in fire slash,is crucial for guiding ecological restoration efforts.The fire slash of Larix gmelinii forest after restoration for 1 year from low,medium and high severity fires in the Bilahe Forestry Bureau of Inner Mongolia were selected as research subjects.Using phospholipid fatty acid(PLFA)analysis,soil microbial biomass and community composition were assessed at soil depth from 0 to 5 cm.Differences in soil microbial biomass,community composition and diversity in flat and sloping lands of different fire severities were analyzed.The combined effects of fire severity,slope,and soil nutrient indicators on soil microbial biomass were further explored by redundancy analysis(RDA)and structural equation modeling(SEM).1)Among microbial groups in both control plots and burnt areas,Gram-negative bacteria had the highest biomass,followed by Bacteria and Grampositive bacteria,then Fungi and Actinomycetes,and the smallest was Arbuscularmycorrhizal fungi.2)The biomass of Arbuscularmycorrhizal fungi was hardly affected by fire.Except for the Arbuscularmycorrhizal fungi,the biomass of microbial groups and community diversity indices of flat soil increased but were insignificant after fire,while in sloping soils,microbial biomass increased significantly(P<0.05).Biomass and community diversity indices of soil microbial groupsinsloping soil were largest after low severity fires.The change of Grampositive bacterial biomass was the main driving force of the response of soil microbial community to fire severities in sloping land.3)Fire severity,slope,and soil nutrient indicators all significantly(P<0.01)affected the biomass of microbial groups,with the direct effect in the order of soil nutrient indicators,fire severity,and slope.Soil nutrient indicators of water-soluble organic carbon content were strongly and positively correlated with the biomass of fungi,and ammonium nitrogen content was positively correlated with the biomass of Gram-positive bacteria.Consequently,fire severity and slope not only have a direct effect on soil microbial biomass and community composition,but also have an indirect effect on the biomass of soil microbial groups by regulating soil nutrient indicators.

Key words： fire severity; Larix gmelinii; sloping land; soil microbes; PLFA

Cite this article

Guang YANG , Xinyu WANG , Yunjia MA , Zhaoyan LIU , Lixuan WANG , Jian SUN . The Impact of Fire Severity on Soil Microbial Biomass and Community Composition in Larix gmelinii Forests[J]. Forest and Grassland Resources Research, 2024 , 0(6) : 35 -44 . DOI: 10.13466/j.cnki.lczyyj.2024.06.005

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