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<p>This study aims to explore the interactive effects of moss cover (moss-covered vs. bare soil), seasonal variation (summer vs. winter), soil depth (0–2, 2–5, and 5–10&#xa0;cm), and forest types (evergreen coniferous forest, bamboo forest, deciduous broad-leaved forest, mixed deciduous broad-leaved forest, evergreen and deciduous broad-leaved mixed forest, evergreen shrub) on soil organic carbon (SOC) and nitrogen (N) dynamics in a karst urban ecosystem.&#xa0;To investigate how moss-mediated microclimate regulation influences SOC and N content, we employed a stratified sampling approach in June and December 2023. We compared SOC and N levels between moss-covered areas and bare ground control plots (vegetation coverage &lt; 5%, located &gt; 20&#xa0;m away from moss patches) across six forest stand types, examining the interactions among moss coverage, season, soil depth, and forest stand type.&#xa0;Moss cover significantly increased SOC and N levels (except for microbial biomass carbon (MBC) in 2–5&#xa0;cm and 5–10&#xa0;cm depths of winter evergreen coniferous forests), with the most pronounced SOC increase in 0–2&#xa0;cm moss-covered soil during summer (<i>p</i> &lt; 0.05). In mixed deciduous broad-leaved forest, moss nutrient accumulation was notably enhanced in summer, while in bamboo forest, this capacity was more evident in winter. SEM indicated that moss coverage reduced surface soil temperature, increased soil water content, and enhanced moss-derived C-N-P inputs, collectively driving soil SOC-N dynamics.&#xa0;Mosses critically regulate soil SOC-N dynamics via seasonal microclimate modulation and forest-type-dependent nutrient allocation, demonstrating their essential ecological role in fragile karst ecosystems.</p>

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Interactive Effects of Moss Cover and Seasonal Variation on Soil Organic Carbon and Nitrogen Dynamics in Six Types of Forest Stands in Karst Urban Park

  • 期刊论文

  • 发表日期：

    2026年1月13日

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  • Yinfang Zhang,
  • Xiurong Wang,
  • Yingying Zheng,
  • Yu Xie,
  • Lizhen Chai

摘要

This study aims to explore the interactive effects of moss cover (moss-covered vs. bare soil), seasonal variation (summer vs. winter), soil depth (0–2, 2–5, and 5–10 cm), and forest types (evergreen coniferous forest, bamboo forest, deciduous broad-leaved forest, mixed deciduous broad-leaved forest, evergreen and deciduous broad-leaved mixed forest, evergreen shrub) on soil organic carbon (SOC) and nitrogen (N) dynamics in a karst urban ecosystem. To investigate how moss-mediated microclimate regulation influences SOC and N content, we employed a stratified sampling approach in June and December 2023. We compared SOC and N levels between moss-covered areas and bare ground control plots (vegetation coverage < 5%, located > 20 m away from moss patches) across six forest stand types, examining the interactions among moss coverage, season, soil depth, and forest stand type. Moss cover significantly increased SOC and N levels (except for microbial biomass carbon (MBC) in 2–5 cm and 5–10 cm depths of winter evergreen coniferous forests), with the most pronounced SOC increase in 0–2 cm moss-covered soil during summer (p < 0.05). In mixed deciduous broad-leaved forest, moss nutrient accumulation was notably enhanced in summer, while in bamboo forest, this capacity was more evident in winter. SEM indicated that moss coverage reduced surface soil temperature, increased soil water content, and enhanced moss-derived C-N-P inputs, collectively driving soil SOC-N dynamics. Mosses critically regulate soil SOC-N dynamics via seasonal microclimate modulation and forest-type-dependent nutrient allocation, demonstrating their essential ecological role in fragile karst ecosystems.