Liu Qian, Yang Wenquan, Kou Jiancun, Li Qinyao, Zhang Yangcan, Li Xilai, Zhang Jing, Hao Zhiting, Chi Lu, Ning Yuze
College of Grassland Agriculture, Northwest A&F University, Yangling, China.
College of Life Sciences, Northwest A&F University, Yangling, China.
Front Microbiol. 2025 Jul 25;16:1627840. doi: 10.3389/fmicb.2025.1627840. eCollection 2025.
The response of soil microorganisms to environmental changes can affect the storage and stability of carbon pools in ecosystems. However, the intrinsic link between the structure of soil carbon-metabolizing microbial communities and their roles in different types of alpine grasslands remains unclear.
This study explores how carbon storage varies among alpine meadow (AM), alpine wetland (AW), and alpine desert (AD) on the Qinghai-Tibet Plateau and assesses the influence of a wide range of soil microbial and vegetation factors, so as to identify microbial predictors of ecosystem carbon storage. The study revealed four types of carbon metabolizing microbial communities responded to changes in vegetation types and their impact on the storage and stability of carbon pools.
The carbon storage of three grassland types followed the relativity of AW > AM > AD. Soil water content (SWC) was identified as the major factor affecting the carbon storage of grassland ecosystems by increasing vegetation belowground biomass and soil total carbon content, directly or indirectly influencing the diversity of four types of soil microorganisms through its effects on soil physicochemical properties. The community structure of these four types of carbon metabolizing microorganisms in AW significantly differed from that of AM and AD. The diversity of carbon-fixing microorganisms significantly reduced ecosystem carbon storage to a great extent. The relative abundance of carbon-fixing microorganisms , , , and significantly increased grassland carbon storage, while the relative abundance of chitinase-producing microorganisms and significantly decreased it.
土壤微生物对环境变化的响应会影响生态系统中碳库的储存和稳定性。然而，土壤碳代谢微生物群落结构与其在不同类型高寒草原中的作用之间的内在联系仍不清楚。
本研究探讨了青藏高原高寒草甸（AM）、高寒湿地（AW）和高寒荒漠（AD）之间的碳储存差异，并评估了多种土壤微生物和植被因素的影响，以确定生态系统碳储存的微生物预测指标。研究揭示了四种类型的碳代谢微生物群落对植被类型变化及其对碳库储存和稳定性的影响做出了响应。
三种草地类型的碳储存量呈现出AW>AM>AD的关系。土壤含水量（SWC）被确定为影响草地生态系统碳储存的主要因素，它通过增加植被地下生物量和土壤总碳含量，直接或间接地通过对土壤理化性质的影响来影响四种土壤微生物的多样性。AW中这四种碳代谢微生物的群落结构与AM和AD显著不同。固碳微生物的多样性在很大程度上显著降低了生态系统的碳储存。固碳微生物、、、和的相对丰度显著增加了草地碳储存，而产几丁质酶微生物和的相对丰度则显著降低了草地碳储存。
