优势种嵩草向毒草转变与高寒草甸山坡秃斑化的潜在关联

doi:10.1093/jpe/rtaf134

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优势种嵩草向毒草转变与高寒草甸山坡秃斑化的潜在关联

收稿日期:2025-05-30 接受日期:2025-08-18

The shift from dominant Kobresia species to toxic plants is associated with bare patch encroachment on alpine meadow hillslopes

Peipei Liu^1,#, Cai-E Wang^1,2,#, Mei Huang¹, A. Allan Degen³, Wenyin Wang¹, Lingyan Qi¹, Binyu Luo¹, Tianyun Qi¹, Jianxin Jiao¹, Zhanhuan Shang^1,*

¹ State Key Laboratory of Herbage Improvement and Grassland Agro‑Ecosystems, College of Ecology, Lanzhou University, Lanzhou, 730000, China.
² Grassland General Station of Xinjiang Uygur Autonomous Region, Urumqi, 830049, China.
³ Institutes for Desert Research, Ben-Gurion University of the Negev, Beer Sheva, 8410500, Israel.
^#Authors contributed equally to this work.
^*Corresponding author: Zhanhuan Shang, Tel: 0931-8915360; shangzhh@lzu.edu.cn; ORCID: https://orcid.org/0000-0002-6069-4708

Received:2025-05-30 Accepted:2025-08-18
Supported by:
This study was supported by the Chief Scientist Program of Qinghai Province (2024-SF101), the Natural Science Foundation of China (U21A20183, 32301340), the Science based Advisory Program of The Alliance of National and International Science Organizations for the Belt and Road Regions (ANSO-SBA-2023-02), the Second Tibetan Plateau Expedition (2019QZKK0302), the Fundamental Research Funds for the Central Universities (lzujbky-2023-pd12), the China Postdoctoral Science Foundation (2024T170370, 2023M731463), the Gansu Province Science and Technology Program (25JRRA715), and the ‘111’ Programme 2.0 (BP0719040).

摘要/Abstract

摘要： 高寒草甸山坡的秃斑化过程可能与植物群落优势种转变有关。为探究这一关系，本研究以青藏高原小流域尺度上的36个高寒草甸山坡为研究对象，调查其优势种组成、灌木入侵和秃斑化特征。研究发现，主坐标分析的前两轴（即PcoA1和PcoA2）可指示植物群落优势种转变过程，其中PcoA1显示高山嵩草转变为冷蒿和黄帚橐吾，PcoA2显示高山嵩草转变为紫菀。通过随机森林模型和混合效应模型分析，发现PcoA1和PcoA2是秃斑化的重要预测因子。结构方程模型进一步表明，有效鼠洞数量可调控PcoA1与秃斑化的关系，而地表砾石覆盖度则调控PcoA2与秃斑化的关系。该研究强调优势种转变与秃斑化过程存在生态关联，并指出冷蒿、黄帚橐吾和紫菀是高寒草甸山坡秃斑化的重要生物指示因子，对于精准管理退化高寒草甸山坡具有重要指导意义。

关键词: 秃斑化, 优势种转变, 莎草与毒草, 鼠兔洞, 砾石覆盖, 高寒草甸山坡

Abstract: Bare patch encroachment is linked with a shift in dominant plant species during the degradation of alpine meadows. Here, we investigated the dominant herbaceous species, and the occurrence of shrub invasion and bare patch cover during grassland degradation on 36 hillslopes along a watershed on the Qinghai-Tibetan Plateau. The increase in bare patch cover was treated as a measure of bare patch encroachment and examined in relation to shifts in dominant species. Based on the first two axes of principal coordinate analysis (PcoA1 and PcoA2), there were evident shifts in dominant herbaceous species. The PcoA1 axis represented a shift of dominant herbaceous species from K. pygmaea to Artemisia frigida and Ligularia virgaurea, while the PcoA2 axis represented a shift from K. pygmaea to Aster tataricus. Based on random forest and linear mixed models, both PcoA1 and PcoA2 were important predictors of bare patch encroachment. Furthermore, the structural equation model supported that the number of active pika burrows mediated the positive relationship between PcoA1 and bare patch cover, while the surface soil gravel cover mediated the relationship between PcoA2 and bare patch cover. These findings highlighted the ecological association between the shift of dominant species and bare patch encroachment, advancing previous findings by identifying the toxic species A. frigida, L. virgaurea and A. tataricus as biotic indicators and benefiting the management of the degrading alpine meadow hillslopes.

Key words: Bare patch, dominant shift, sedge and toxic plants, pika burrow, gravel mulch, alpine meadow hillslope

. 优势种嵩草向毒草转变与高寒草甸山坡秃斑化的潜在关联[J]. Journal of Plant Ecology, DOI: 10.1093/jpe/rtaf134.

Peipei Liu, Cai-E Wang, Mei Huang, A. Allan Degen, Wenyin Wang, Lingyan Qi, Binyu Luo, Tianyun Qi, Jianxin Jiao, Zhanhuan Shang. The shift from dominant Kobresia species to toxic plants is associated with bare patch encroachment on alpine meadow hillslopes[J]. J Plant Ecol, DOI: 10.1093/jpe/rtaf134.