ArticleBMC plant biology2026
Experimental warming alleviates leaf-level physiological stress of Kobresia pygmaea in alpine meadows on the Northeastern Qinghai-Tibet Plateau.
Article in BMC plant biology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundClimate warming can strongly influence alpine plant physiology, but the leaf-level responses of dominant alpine meadow species to warming may vary across elevation and growing-season stages. These spatial and seasonal patterns remain insufficiently known.
resultsWe examined the physiological responses of Kobresia pygmaea on the northeastern Qinghai-Tibet Plateau to long-term passive open-top chamber (OTC) warming across four elevations (3691, 3786, 3981, and 4131 m a.s.l.) from July to September. Across all sites and months, OTC warming increased mean near-surface air temperature by 1.34 °C and surface soil temperature by 1.32 °C, while reducing relative humidity by 5.16% and surface soil moisture by 5.17%. Warming reduced leaf malondialdehyde by 20.2% and proline by 45.3%, suggesting lower membrane lipid peroxidation and reduced osmotic adjustment. Superoxide dismutase activity increased slightly by 2.4%, whereas peroxidase activity increased by 26.3%, indicating enzyme-specific antioxidant regulation. Chlorophyll a, chlorophyll b, and total chlorophyll increased by 72.0%, 66.2%, and 70.2%, respectively. Three-way ANOVA showed significant effects of warming, month, elevation, and their interactions on most physiological indicators.
conclusionModerate OTC warming improved the leaf-level physiological status and photosynthetic pigment capacity of K. pygmaea during the growing season. These benefits were season- and elevation-dependent and occurred under a concurrent drying microclimate. The results provided evidence of a leaf-level physiological response to warming by the dominant species in alpine meadows.
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