<br>亚热带山地森林沿海拔高度土壤有机碳储量及其物理组分的变化,Journal of Environmental Management

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亚热带山地森林沿海拔高度土壤有机碳储量及其物理组分的变化
Journal of Environmental Management ( IF 8.0 ) Pub Date : 2023-12-17 , DOI: 10.1016/j.jenvman.2023.119823
Guopeng Wu ₁ , Gang Huang ₁ , Sinuo Lin ₁ , Zhengyi Huang ₁ , Hao Cheng ₁ , Yangui Su ₁

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土壤微生物是土壤有机碳（SOC）矿化的驱动因素，这些微生物的活动被认为在 SOC 动态中发挥着关键作用。然而，关于土壤微生物碳代谢和 SOC 储量之间关系的研究很少，特别是在不同的物理部分（例如颗粒有机碳（POC）部分和矿物相关有机碳（MAOC）部分）中。在本研究中，我们研究了亚热带山地森林沿海拔梯度0-20 cm SOC库、POC库、MAOC库和微生物碳代谢（例如微生物生长、碳利用效率和生物量周转时间）的变化模式生态系统。我们的结果表明，SOC 和 POC 储量增加，但 MAOC 储量沿海拔梯度保持稳定。随着海拔的升高，土壤微生物生长增加，而微生物周转时间减少。使用结构方程模型，我们发现微生物生长加快与 POC 库存增加相关。此外，MAOC 储量与微生物生长呈正相关，但与 POC 储量和土壤 pH 值呈负相关。总体而言，沿海拔梯度 SOC 储量的增加主要是由 POC 储量而不是 MAOC 储量的变化驱动的。这些发现强调了在预测 SOC 对海拔的响应时考虑不同土壤碳组分和微生物活动的重要性，从而提供对潜在气候变化反馈的见解。

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Changes in soil organic carbon stocks and its physical fractions along an elevation in a subtropical mountain forest

Soil microorganisms are the drivers of soil organic carbon (SOC) mineralization, and the activities of these microorganisms are considered to play a key role in SOC dynamics. However, studies of the relationship between soil microbial carbon metabolism and SOC stocks are rare, especially in different physical fractions (e.g., particulate organic carbon (POC) fraction and mineral-associated organic carbon (MAOC) fraction). In this study, we investigated the changing patterns of SOC stocks, POC stocks, MAOC stocks and microbial carbon metabolism (e.g., microbial growth, carbon use efficiency and biomass turnover time) at 0–20 cm along an elevational gradient in a subtropical mountain forest ecosystem. Our results showed that SOC and POC stocks increased but MAOC stocks remained stable along the elevational gradient. Soil microbial growth increased while microbial turnover time decreased with elevation. Using structural equation modeling, we found that heightened microbial growth is associated with elevated POC stocks. Moreover, MAOC stocks positively correlate with microbial growth but show negative associations with both POC stocks and soil pH. Overall, the increase in SOC stocks along the elevational gradient is primarily driven by changes in POC stocks rather than MAOC stocks. These findings underscore the importance of considering diverse soil carbon fractions and microbial activities in predicting SOC responses to elevation, offering insights into potential climate change feedbacks.

更新日期：2023-12-17

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