Density-dependent functional thresholds and early-warning indicators of alpine meadow degradation under plateau pika (Ochotona curzoniae) and zokor (Myospalax baileyi) disturbance: A meta-analysis - Huan Li; Xiaomei Sun; Qin Zhang; Li Wang; Kehong Xu; Fujiao Wang; Zhengwei Ren; Honglin Li; Junhu Su; Jun Zhang (Journal of Environmental Management, 2026)