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Aims <p>Plant- and microbial-derived C are the primary sources of SOC. However, how afforestation affects the dynamics of plant- and microbial-derived C accumulation remains poorly understood.</p> Methods <p>The plant- and microbial-derived C content and relevant biochemical variables of two soil layers (0–15&#xa0;cm and 15–30&#xa0;cm) were investigated along a chronosequence of <i>cedar</i> plantations (7, 13, 24, 33, and 53&#xa0;years) in subtropical China.</p> Results <p>Regardless of soil layers, both microbial- and plant-derived C exhibited unimodal patterns with stand age, peaking at 33 and 24&#xa0;years, respectively. The contributions of microbial- and plant-derived C to SOC all exhibited declining trends with increasing stand age. Microbial-derived C contents did not differ between soil layers, while plant-derived C contents displayed distinct vertical pattern. Moreover, compared with plant-derived C (4.2%-14.4%), microbial-derived C contributed more to SOC (14.4%-67.7%), with fungal necromass C constituting the predominant fraction. Microbial-derived C was predominantly regulated by total phosphorus (TP) and soil bulk density (SBD) in the 0–15&#xa0;cm layer, but by TP and β–N–acetylglucosaminidase (NAG) activity in the 15–30&#xa0;cm layer. However, plant-derived C was mainly mediated by soil water and pH in both soil layers. The PLS-PM analysis showed that stand age mediated microbial- and plant-derived C pools through influencing soil physicochemical and microbial properties.</p> Conclusion <p>Afforestation management has a significant impact on two C pools and this effect is strongly dependent on soil layers. These findings emphasize the importance of forest practice on plant- and microbial-derived C in SOC accumulation in subtropical area.</p>

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Patterns and drivers of plant- and microbial-derived carbon in a cedar plantation chronosequence of subtropical China

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • Yuehan Wang,
  • Yu Li,
  • Chengming You,
  • Hongwei Xu,
  • Han Li,
  • Lin Xu,
  • Li Zhang,
  • Lixia Wang,
  • Sining Liu,
  • Bo Tan,
  • Yaling Yuan,
  • Jiao Li,
  • Zhenfeng Xu

摘要

Aims

Plant- and microbial-derived C are the primary sources of SOC. However, how afforestation affects the dynamics of plant- and microbial-derived C accumulation remains poorly understood.

Methods

The plant- and microbial-derived C content and relevant biochemical variables of two soil layers (0–15 cm and 15–30 cm) were investigated along a chronosequence of cedar plantations (7, 13, 24, 33, and 53 years) in subtropical China.

Results

Regardless of soil layers, both microbial- and plant-derived C exhibited unimodal patterns with stand age, peaking at 33 and 24 years, respectively. The contributions of microbial- and plant-derived C to SOC all exhibited declining trends with increasing stand age. Microbial-derived C contents did not differ between soil layers, while plant-derived C contents displayed distinct vertical pattern. Moreover, compared with plant-derived C (4.2%-14.4%), microbial-derived C contributed more to SOC (14.4%-67.7%), with fungal necromass C constituting the predominant fraction. Microbial-derived C was predominantly regulated by total phosphorus (TP) and soil bulk density (SBD) in the 0–15 cm layer, but by TP and β–N–acetylglucosaminidase (NAG) activity in the 15–30 cm layer. However, plant-derived C was mainly mediated by soil water and pH in both soil layers. The PLS-PM analysis showed that stand age mediated microbial- and plant-derived C pools through influencing soil physicochemical and microbial properties.

Conclusion

Afforestation management has a significant impact on two C pools and this effect is strongly dependent on soil layers. These findings emphasize the importance of forest practice on plant- and microbial-derived C in SOC accumulation in subtropical area.