Water availability mediates elevational responses of ecosystem respiration to warming in Tibetan semi-arid montane meadows

文献类型： 外文期刊

第一作者： Qu, Guangpeng

作者： Qu, Guangpeng;Zhao, Jingxue;Zhao, Jingxue;Wu, Gao-Lin;Wu, Gao-Lin

作者机构：

关键词： Ecosystem respiration; Carbon cycling; Plant productivity; Climate warming; Elevational gradient

期刊名称：GLOBAL ECOLOGY AND CONSERVATION （ 影响因子：3.4； 五年影响因子：4.3 ）

ISSN：

年卷期： 2025 年 62 卷

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收录情况： SCI

摘要： Montane grasslands serve as large soil carbon reservoirs on the Tibetan Plateau, yet they are highly sensitive to climate warming. However, the extent to which climate warming modifies elevational variations of ecosystem respiration in these montane grasslands remains poorly understood. We hypothesized that warming effects on ecosystem respiration across elevations are closely linked to water availability in Tibetan semi-arid montane meadows. To evaluate this hypothesis, an elevational warming experiment was conducted across seven meadow sites (4600-5200 m) on the Tibetan Plateau. During the growing season, we measured ecosystem respiration and related biotic and abiotic factors under both warming and ambient conditions. Our results revealed that experimental warming generally tended to enhance growing season ecosystem respiration across elevations. Warming-induced changes in ecosystem respiration were primarily regulated by plant productivity and soil carbon content. Further analysis indicated that warming-induced stimulation of ecosystem respiration increased with increasing elevation, largely driven by greater precipitation and improved soil water conditions in higher elevations. These findings support the hypotheses that the magnitude of warming effects on elevational variation in ecosystem respiration is strongly associated with local precipitation and soil hydrological properties in Tibetan semi-arid montane meadows. This study highlighted the importance of water availability in mediating warming-induced changes in ecosystem respiration, with broad implications for understanding the impacts of future climatic warming on carbon cycling in alpine ecosystems.

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