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The impact of soil warming on fine root trait responses of trees, deciduous vs. coniferous: a meta-analysis

Azadeh Rezapour
Azadeh Rezapour
, 
Mohammadreza Labbafi
Mohammadreza Labbafi
 und 
Tõnu Oja
Tõnu Oja
   | 04. Mai 2023
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Article Category: Research paper
Online veröffentlicht: 04. Mai 2023
Seitenbereich: 67 - 75
Eingereicht: 04. Dez. 2022
Akzeptiert: 30. Dez. 2022
DOI: https://doi.org/10.2478/fsmu-2022-0013
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© 2022 Azadeh Rezapour et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.

Figure 1.

Effect sizes of fine root traits, including fine root biomass (FRB), and fine root morphological traits, such as specific root length (SRL), specific root area (SRA), and diameter (D) of coniferous and deciduous trees to soil warming. Error bars represent 95% confidence intervals (CI). The vertical line shows an effect size of zero. The effect of soil warming on fine root traits was considered significant if the 95% CI of the effect size for a variable did not overlap zero.
Effect sizes of fine root traits, including fine root biomass (FRB), and fine root morphological traits, such as specific root length (SRL), specific root area (SRA), and diameter (D) of coniferous and deciduous trees to soil warming. Error bars represent 95% confidence intervals (CI). The vertical line shows an effect size of zero. The effect of soil warming on fine root traits was considered significant if the 95% CI of the effect size for a variable did not overlap zero.

Figure 2.

Meta-regression slops showing fine root biomass variation in relation to the warming magnitude and soil depth. The sizes of the circles correspond to the weight given to each individual study in the meta-analysis. Larger circles represent a higher weighting.
Meta-regression slops showing fine root biomass variation in relation to the warming magnitude and soil depth. The sizes of the circles correspond to the weight given to each individual study in the meta-analysis. Larger circles represent a higher weighting.

Summary of the meta-regression model, P values <0.05 are significant.

Fine root traits Moderator variables Tree species Covariate Coefficient Standard Error 95% Lower 95% Upper Z-value Two-tailed P-value R2
FRB Warming magnitude Overall Intercept 2.13 0.581 0.99 3.27 3.67 0.00 0.28
Warming magnitude -0.53 0.178 -0.87 -0.18 -2.99 0.00
Coniferous Intercept 3.21 0.796 1.64 4.77 4.03 0.00 0.56
Warming magnitude -0.84 0.235 -1.30 -0.38 -3.59 0.00
Deciduous Intercept 1.02 0.733 -0.41 2.46 1.40 0.16 0.01
Warming magnitude -0.11 0.255 -0.61 0.38 -0.44 0.66
Soil depth Overall Intercept -0.00 0.58 -1.16 1.14 -0.01 0.98 0.07
Soil depth 0.05 0.04 -0.02 0.13 1.38 0.16
Coniferous Intercept 0.21 0.96 -1.67 2.10 0.22 0.82 0.08
Soil depth 0.05 0.05 -0.06 0.16 0.85 0.39
Deciduous Intercept -0.34 0.93 -2.18 1.49 -0.37 0.71 0.20
Soil depth 0.12 0.09 -0.06 0.32 1.28 0.20
SRA Warming magnitude Overall Intercept -1.06 1.78 -4.55 2.42 -0.60 0.54 0.42
Warming magnitude 0.73 0.46 -0.18 1.64 1.57 0.11
Soil depth Intercept -1.03 1.36 -3.70 1.63 -0.76 0.44 0.65
Soil depth 0.14 0.07 0.00 0.29 1.99 0.04
SRL Warming magnitude Overall Intercept -1.06 1.78 -4.55 2.42 -0.60 0.54 0.42
Warming magnitude 0.73 0.46 -0.18 1.64 1.57 0.11
Soil depth Intercept -1.03 1.36 -3.70 1.63 -0.76 0.44 0.65
0.14 0.07 0.00 0.29 1.99 0.04
D Warming magnitude Overall Intercept 0.49 0.51 -0.52 1.50 0.95 0.34 1.00
Warming magnitude -0.13 0.06 -0.25 -0.00 -2.06 0.03
Soil depth Intercept -2.82 0.95 -4.68 -0.95 -2.97 0.00 1.00
Soil depth 0.16 0.05 0.04 0.27 2.77 0.00
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