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Updated: Jun 10, 2025

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Thinning-induced decrease in fine root biomass, but not other fine root traits in global forests.

Jianghuan Qin1, Jun Lu1, Yifei Peng2

  • 1State Key Laboratory of Efficient Production of Forest Resources, Key Laboratory of Forest Management and Growth Modelling, National State Forestry and Grassland Administration, Research Institute of Forest Resource Information Techniques, Chinese Academy of Forestry, Beijing, China.

Journal of Environmental Management
|October 17, 2024
PubMed
Summary
This summary is machine-generated.

Forest thinning reduces fine root biomass but largely leaves other root traits unchanged. Recovery time and thinning intensity influence biomass, with implications for soil carbon in managed forests.

Keywords:
Root biomassRoot traitSoil carbonThinning intensityTrait variation

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Area of Science:

  • Forest Ecology
  • Belowground Ecosystem Processes
  • Forest Management

Background:

  • Forest thinning is a common management practice impacting forest structure and function.
  • Fine root traits are crucial for belowground resource acquisition and ecosystem processes.
  • Understanding how thinning affects root traits is vital for predicting forest responses.

Purpose of the Study:

  • To globally evaluate the response of 13 fine root traits to forest thinning.
  • To investigate the influence of stand recovery time and thinning intensity on root trait expression.
  • To assess the implications of thinning-induced root trait changes for soil carbon stocks.

Main Methods:

  • Global meta-analysis of 769 paired observations from 89 peer-reviewed publications.
  • Analysis of fine root morphological, chemical, and physiological traits.
  • Examination of effects based on stand recovery stage, thinning intensity, soil depth, and forest type.

Main Results:

  • Forest thinning decreased fine root biomass by an average of 11.7%.
  • Fine root length, C/N concentrations, lifespan, and respiration rates were largely unresponsive.
  • Thinning effects on biomass varied with stand recovery stage, thinning intensity, and soil depth, with reductions in temperate and coniferous forests.

Conclusions:

  • Forest thinning significantly alters fine root biomass, but other traits show limited response.
  • Stand recovery time and thinning intensity are key regulators of fine root biomass.
  • Changes in root traits, particularly reduced biomass in deeper soils, have implications for soil carbon dynamics in managed forests.