气候变暖增加了青藏高原高寒草甸优势物种的根系分泌速率
摘要： 摘 要 近年来, 植物根系分泌物作为植物-土壤-微生物相互作用的关键环节, 逐渐受到越来越多的关注。然而, 由于草地植物根系交织复杂, 关于气候变暖对草本植物根系分泌速率的影响研究仍然较为有限。本研究以青藏高原高寒草甸10种优势植物为对象, 开展室内气候培养箱实验, 通过原位动态收集根系分泌物, 定量分析增温(+4 ℃)条件下优势物种根系碳分泌速率的变化及其影响因素。结果表明: (1) 增温显著提高了大多数优势物种的根系碳分泌速率, 使整体水平提升了83.48 ± 6.00 μg·g-1·h-1, 但降低了豆科植物的根系分泌速率; (2) 增温引起的根系分泌速率变化与植物性状的变化密切相关, 其中根氮含量对增温下植物根系分泌速率的解释力最强。本研究结果表明, 气候变暖将增强高寒草甸植物优势物种的根系分泌速率, 并强调了功能性状在调控根系分泌速率响应气候变暖中的重要作用。该研究有助于理解气候变化背景下高寒草甸根际碳动态, 为进一步预测青藏高原土壤碳库的变化提供科学依据。
关键词: 根系分泌速率, 植物功能性状, 增温, 高寒草甸, 植物经济型谱
Abstract: Abstract Aims Plant root exudates have received increasing attentions as a key link in plant-soil-microbe interactions in recent years. However, studies on the impact of climate warming on the root exudation rates of grassland plants remain relatively limited. Methods In this study, we conducted a laboratory controlled experiment with 10 dominant plant species in alpine meadows of the Tibetan Plateau. We collected root exudates in situ to quantitatively analyze the changes in root carbon exudation rates of the dominant species under experimental warming (+ 4 °C) and identified the factors influencing these changes. Important findings Our results showed that: (1) Warming significantly increased the root carbon exudation rate of most dominant species, with an overall increase of 83.48 ± 6.00 μg·g-1·h-1, but it decreased the root exudation rate in leguminous plants; (2) The changes in root exudation rates induced by warming were closely related to plant traits, with root nitrogen content explaining the highest variation in root exudation rates under warming conditions. These findings suggest that climate warming will enhance the root exudation rates of dominant species in alpine meadows and highlight the critical role of functional traits in regulating root exudation responses to warming. This study contributes to the understanding of rhizosphere carbon dynamics in the context of climate change and provides scientific evidence for further predicting changes in the soil carbon dynamics of the Qinghai-Tibet Plateau.
Key words: root exudation rate, plant functional trait, climate warming, alpine meadow, plant economics spectrum
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