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<p>An in-depth understanding of the spatial heterogeneity of soil organic carbon (SOC) content, density, and stock, along with their driving factors in peatlands, is crucial for climate change mitigation. Here, SOC content denotes the mass of SOC present in each kilogram of dry soil; volume-based SOC density refers to the mass of SOC per unit volume of soil; area-based SOC density refers to the mass of SOC per unit area of land; and SOC stock represents the total quantity of SOC stored within a specific land area. Using Yunnan Province as a case study, this research investigated the spatial variability of SOC content, density, and stock across different peatland types characterized by various plant formation types, based on data collected from 168 sampling sites. The relationships between SOC parameters and location-based, climatic, soil, hydrological, and peat-related variables were analyzed using Kendall’s tau_b, Spearman’s rho, and Pearson correlation coefficients, combined with stepwise regression analysis. Peatlands in Yunnan Province store approximately 1.46 million tons of SOC across an area of 2,229.93 hectares, exhibiting significant spatial heterogeneity. Five peat types and 14 plant formation types had SOC contents above 300 g•kg<sup>−</sup><sup>1</sup>. Among the six identified peat types, four had SOC stocks above 6,000 tons, and among the 35 plant formation types, 11 had SOC stocks above 5,000 tons. SOC stock was significantly negatively correlated with latitude, elevation, and annual precipitation, and positively correlated with annual temperature, water table depth, soil pH, and the degree of decomposition of soil organic matter (<i>p</i> &lt; 0.05). Water table depth and the degree of soil organic matter decomposition had a positive influence on SOC stock, whereas altitude, longitude, annual precipitation, and annual temperature showed negative correlations (<i>p</i> &lt; 0.05). However, these variables collectively explained only 33.3% of the observed variation in SOC stock. Therefore, comprehensive strategies are essential for the conservation and restoration of peatland carbon pools.</p>

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Spatial heterogeneity of soil organic carbon stocks was related to peat types, plant formation groups, and driving factors in peatlands: a case study in Yunnan Province, China

  • 期刊论文

  • 发表日期：

    2025年9月12日

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  • Jianguo Wu

摘要

An in-depth understanding of the spatial heterogeneity of soil organic carbon (SOC) content, density, and stock, along with their driving factors in peatlands, is crucial for climate change mitigation. Here, SOC content denotes the mass of SOC present in each kilogram of dry soil; volume-based SOC density refers to the mass of SOC per unit volume of soil; area-based SOC density refers to the mass of SOC per unit area of land; and SOC stock represents the total quantity of SOC stored within a specific land area. Using Yunnan Province as a case study, this research investigated the spatial variability of SOC content, density, and stock across different peatland types characterized by various plant formation types, based on data collected from 168 sampling sites. The relationships between SOC parameters and location-based, climatic, soil, hydrological, and peat-related variables were analyzed using Kendall’s tau_b, Spearman’s rho, and Pearson correlation coefficients, combined with stepwise regression analysis. Peatlands in Yunnan Province store approximately 1.46 million tons of SOC across an area of 2,229.93 hectares, exhibiting significant spatial heterogeneity. Five peat types and 14 plant formation types had SOC contents above 300 g•kg−1. Among the six identified peat types, four had SOC stocks above 6,000 tons, and among the 35 plant formation types, 11 had SOC stocks above 5,000 tons. SOC stock was significantly negatively correlated with latitude, elevation, and annual precipitation, and positively correlated with annual temperature, water table depth, soil pH, and the degree of decomposition of soil organic matter (p < 0.05). Water table depth and the degree of soil organic matter decomposition had a positive influence on SOC stock, whereas altitude, longitude, annual precipitation, and annual temperature showed negative correlations (p < 0.05). However, these variables collectively explained only 33.3% of the observed variation in SOC stock. Therefore, comprehensive strategies are essential for the conservation and restoration of peatland carbon pools.