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Effects of Understory Vegetation Heterogeneity on Soil Organic Carbon Components in Cunninghamia lanceolata Plantation

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  • Ruipeng Song

    (College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China)

  • Xiaomeng Han

    (Luoyang Institute of Science and Technology, Luoyang 471026, China)

  • Qifan Yang

    (College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China)

  • Zhiheng Zheng

    (College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China)

  • Dan Xi

    (College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China
    Lushan Botanical Garden, Chinese Academy of Sciences, Jiujiang 332900, China)

Abstract

As one of the important factors affecting forest soil organic carbon stocks, the effect of understory vegetation types on soil organic carbon and its components was explored to provide a theoretical basis for understory vegetation management and sustainable management in plantation forests. In order to determine the characteristics of soil organic carbon and its components under different understory vegetation types in Subtropical Cunninghamia lanceolata plantation, Indocalamus tessellatus , Diplazium donianum and Oreocnide frutescenssp were taken as research objects. The mass fractions of total organic carbon, recalcitrant organic carbon, readily oxidizable organic carbon, microbial biomass carbon and dissolved organic carbon in each soil layer at 0–10, 10–20, 20–40 and 40–60 cm were measured, and the change characteristics of soil organic carbon components were also studied and compared. The results showed that: (1) The mass fractions of total organic carbon, recalcitrant organic carbon, readily oxidizable organic carbon and microbial biomass carbon in the soils of the three understory vegetation types showed significant decreasing trends along the profile, while the mass fraction of dissolved organic carbon in 0–40 cm soil layer was significantly higher than those in 40–60 cm soil layer. (2) The mass fraction of total organic carbon (5.98–20.66 g·kg −1 ) had no significant difference among understory vegetation types. The mass fraction and proportion of microbial biomass carbon were higher in the 0–60 cm soil layer under cover of Indocalamus tessellatus , and the mass fractions of recalcitrant organic carbon in the 20–40 cm soil layer under Indocalamus tessellatus cover (8.57 g·kg −1 ) was significantly higher than that of Oreocnide frutescenssp (5.73 g·kg −1 ). The soil layer of 0–20 cm under the Diplazium donianum community has a higher mass fraction and proportion of readily oxidizable organic carbon. (3) Correlation analysis showed that soil organic carbon and its components were positively correlated with total nitrogen, dissolved total nitrogen, dissolved organic nitrogen and microbial biomass nitrogen. There is a significant positive correlation among the components of soil organic carbon. (4) Redundancy analysis showed that soil bulk density (41.6%), microbial biomass nitrogen (41.2%), dissolved total nitrogen (43.7%), total nitrogen (9.9%), dissolved organic nitrogen (43.6%) and pH (6.6%) were the most significant environmental factors affecting organic carbon components in four soil layers. Understory vegetation type can influence the distribution characteristics of soil organic carbon components in Cunninghamia lanceolata plantation, and soil active organic carbon components are more susceptible to the influence of understory vegetation type than total organic carbon and recalcitrant organic carbon.

Suggested Citation

  • Ruipeng Song & Xiaomeng Han & Qifan Yang & Zhiheng Zheng & Dan Xi, 2022. "Effects of Understory Vegetation Heterogeneity on Soil Organic Carbon Components in Cunninghamia lanceolata Plantation," Land, MDPI, vol. 11(12), pages 1-12, December.
    • Handle: RePEc:gam:jlands:v:11:y:2022:i:12:p:2300-:d:1003912
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    References listed on IDEAS

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    1. W. Knorr & I. C. Prentice & J. I. House & E. A. Holland, 2005. "Long-term sensitivity of soil carbon turnover to warming," Nature, Nature, vol. 433(7023), pages 298-301, January.
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