Table 3 Spearman correlation coefficients between soil aggregates, the organic carbon components, environmental factors, and other soil properties along the elevational gradient.

Parameter	Elevation (m)	MAT (℃)	MAP (mm)	pH (H₂O)	EC (µS·cm⁻¹)	SOC (g·kg⁻¹)	TN (g·kg⁻¹)	C/N
MWD (mm)	0.290**	−0.290**	0.293**	0.022	0.096	0.076	0.077	−0.015
GMD (mm)	0.250**	−0.250**	0.253**	0.040	0.111	0.076	0.068	−0.003
Macroaggregate (%)	0.293**	−0.293**	0.296**	0.021	0.095	0.073	0.074	−0.015
Microaggregate (%)	−0.365**	0.365**	−0.367**	0.047	−0.058	−0.064	−0.079	0.032
Silt + Clay (%)	0.183	−0.183	0.178	−0.188	−0.106	−0.083	−0.036	−0.069
LMA-C (g·kg⁻¹)	0.251**	−0.251**	0.247**	−0.054	0.147	0.496**	0.524**	0.002
MIA-C (g·kg⁻¹)	0.215*	−0.215*	0.212*	−0.081	0.115	0.409**	0.488**	−0.072
SCA-C (g·kg⁻¹)	−0.195*	0.195*	−0.196*	0.086	0.112	0.309**	0.289**	0.068
POC (g·kg⁻¹)	0.285**	−0.285**	0.282**	−0.155	0.183	0.790**	0.450**	0.445**
EOC (g·kg⁻¹)	0.198*	−0.198*	0.195*	−0.139	0.259**	0.825**	0.609**	0.351**
DOC (g·kg⁻¹)	−0.061	0.061	−0.057	−0.413**	−0.158	0.084	0.031	0.132
MBC (g·kg⁻¹)	−0.032	0.032	−0.025	0.099	0.571**	0.325**	0.219*	0.200*

MWD mean weight diameter, GMD geometric mean diameter, LMA-C macroaggregate C, MIA-C microaggregate C, SCA-C silt + clay C, POC particulate organic carbon, EOC easily oxidizable organic carbon, DOC dissolved organic carbon, MBC microbial biomass carbon, MAT mean annual temperature, MAP mean annual precipitation, EC soil electrical conductivity, SOC soil organic carbon, TN total nitrogen, C/N carbon-nitrogen ratio. Significant correlations are denoted by *p < 0.05; ** p < 0.01.

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