Li Shan, Zhou Huakun, Wang Wenying, Ade Haze, Zhang Zhonghua, Ma Li, Wang Zhen, Zhang Qiang, Wei Jingjing, Su Hongye, Qin Ruimin, Shi Zhengchen, Hu Xue, Wu Faliang
College of Geographical Sciences, Qinghai Normal University, Xining, China.
Qinghai Provincial Key Laboratory of Restoration Ecology in Cold Regions, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, China.
Front Microbiol. 2025 Jan 6;15:1485069. doi: 10.3389/fmicb.2024.1485069. eCollection 2024.
The makeup of soil microbial communities may serve as a crucial predictor of the alpine grassland ecosystem. Climate change and human disturbance have resulted in intensified ecosystem degradation, such as grassland rocky desertification, which may modify the structures and composition of the microorganisms. However, little is known about the effects of rocky desertification on soil microbial communities of soil. Here, we investigated five different layers of rocky desertification grassland in the Qinghai-Tibet Plateau, including nil rock desertification (NRD); potential rocky desertification (PRD); light rocky desertification (LRD); moderate rocky desertification (MRD); and severe rocky desertification (SRD), we compared soil bacterial community with soil physiochemical properties in different rocky desertification conditions. The result showed that rocky desertification significantly altered the physiochemical properties of the soil but did not significantly affect the bacterial community microbial abundance and diversity. At the same time as rocky desertification increased, soil organic carbon (SOC), total nitrogen (TN), alkali hydrolyzable nitrogen (AN), available phosphorus (AP), and available potassium (AK) decreased significantly, while soil pH, total phosphorus (TP); and total potassium (TK) increased. Redundancy analysis revealed that pH, AK, TP, and SOC are key factors influencing soil bacterial communities. Our finding provides basic information and scientific reference for the restoration of the rocky desertification of alpine grasslands.
土壤微生物群落的组成可能是高寒草原生态系统的关键预测指标。气候变化和人类干扰导致生态系统退化加剧，如草地石漠化，这可能会改变微生物的结构和组成。然而，关于石漠化对土壤微生物群落的影响却知之甚少。在此，我们调查了青藏高原石漠化草地的五个不同层次，包括无石漠化（NRD）；潜在石漠化（PRD）；轻度石漠化（LRD）；中度石漠化（MRD）；和重度石漠化（SRD），我们比较了不同石漠化条件下土壤细菌群落与土壤理化性质。结果表明，石漠化显著改变了土壤的理化性质，但对细菌群落的微生物丰度和多样性没有显著影响。随着石漠化程度的增加，土壤有机碳（SOC）、全氮（TN）、碱解氮（AN）、有效磷（AP）和有效钾（AK）显著降低，而土壤pH值、全磷（TP）和全钾（TK）升高。冗余分析表明，pH值、AK、TP和SOC是影响土壤细菌群落的关键因素。我们的研究结果为高寒草原石漠化的恢复提供了基础信息和科学参考。
