[1]Wang Qian,Wu Xinliang,Guan Yinghui.Effects of hydrothermal variations on organic carbon mineralization in forest soil profiles at different altitudes of Yulong Snow Mountain[J].Research of Soil and Water Conservation,2025,32(06):47-56.[doi:10.13869/j.cnki.rswc.2025.06.045]
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Effects of hydrothermal variations on organic carbon mineralization in forest soil profiles at different altitudes of Yulong Snow Mountain
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
32
Number of periods:
2025 06
Page number:
47-56
Column:
Public date:
2025-10-20
- Title:
- Effects of hydrothermal variations on organic carbon mineralization in forest soil profiles at different altitudes of Yulong Snow Mountain
- Keywords:
- soil organic carbon mineralization; temperature; moisture; soil profile; Yulong Snow Mountain
- CLC:
- S714.2
- DOI:
- 10.13869/j.cnki.rswc.2025.06.045
- Abstract:
- [Objective] To investigate the vertical differentiation patterns of soil organic carbon (SOC) mineralization across forest soil profiles at different altitudes in Yulong Snow Mountain, and to reveal the mechanisms by which hydrothermal conditions affect soil carbon turnover, thereby providing a scientific basis for the management of mountain forest soil carbon pools and the evaluation of forestry carbon sink functions. [Methods] Laboratory incubation experiments were conducted under two temperature levels(10 ℃ and 20 ℃) and three moisture gradients〔 100%, 60%, and 30% of water holding capacity(WHC)〕 to investigate the effects of different hydrothermal conditions on SOC mineralization across three soil layers(humus layer, topsoil, and sub soil) of two typical forest soil profiles at different altitudes of Yulong Snow Mountain. [Results] Temperature significantly affected the SOC mineralization rate and cumulative mineralization in the humus and topsoil layers(p<0.05), while soil moisture mainly regulated the mineralization rate in subsoils at high altitudes and significantly affected cumulative mineralization across all soil layers(p<0.05). Moreover, SOC mineralization in subsoils of forestlands at high altitudes was significantly affected by the interaction between temperature and moisture(p<0.05). SOC mineralization was strongest under the conditions of 20 ℃ and 60% WHC, while 30% WHC significantly suppressed SOC mineralization, resulting in the lowest cumulative mineralization. The humus layer exhibited the greatest sensitivity to temperature, and subsoils at low altitudes showed a stronger temperature response than the topsoil. Variations in soil texture and concentrations of Mg?? and K? significantly affected SOC mineralization, serving as key variables regulating temperature responses at different altitudes. [Conclusion] SOC mineralization in forest soils at high altitudes exhibits greater sensitivity to variations in temperature and moisture, with moisture being the key factor limiting carbon release from subsoils. SOC mineralization in topsoil is primarily driven by temperature, while that in subsoils is mainly regulated by moisture. The responses of different soil layers to hydrothermal variations are affected by the physicochemical properties of soil profiles, highlighting the importance of incorporating subsoil dynamics into forest carbon cycle models and carbon sink management.
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Last Update:
2025-12-10