Full
Outline
The dynamic changes of soil organic matter (SOM) in alpine ecosystems were investigated using lignin as a molecular marker. Soils from a swamp meadow (WQZ) and a subalpine meadow (AMX) in Hongyuan County, on the northwestern Sichuan Plateau, were analyzed to examine the vertical distribution, degradation state, and environmental drivers of lignin within the soil profile. The results indicated that: In AMX, soil pH was observed to increase with depth, while water content remained low. Both SOM and lignin contents were found to decrease with depth, and soil texture exhibited clear vertical variation. In contrast, WQZ soils showed minimal inter-layer pH variation and high water content ((3times that of AMX). Affected by seasonal waterlogging, SOM and lignin in WQZ initially decreased and then increased with depth. All WQZ profiles were identified as clay loam, with fine particle content exceeding 90%. High lignin content in the AMX surface layer was attributed to root input and declined markedly with depth. In WQZ, long-term flooding was associated with lignin accumulation in deeper layers via leaching or bioturbation, resulting in higher relative lignin contribution to SOM at depth compared to surface layers. Ratios of guaiacyl (Ad/Al)v and syringyl (Ad/Al)s monomers in both soil types exceeded 0.6across all layers, indicating significant oxidative degradation of lignin side chains, which intensified with depth. Demethylation/methoxylation degradation was more pronounced in AMX than in WQZ. Lignin stability was regulated by soil texture: absolute lignin content (Σ8) was higher in clay silt, while sand content was positively correlated with the lignin contribution to SOM (Λ8) within the same layer. Prokaryotic and eukaryotic abundances were influenced by soil water content and pH. Proteobacteria dominated the surface layer of AMX, whereas Acidobacteria were more abundant in deeper layers. In WQZ, Chloroflexi were enriched with depth, and basidiomycete abundance was significantly higher in AMX than in WQZ.
66
18
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62662699(Operation and Technical Support)
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
