草地学报

草地学报 ›› 2026, Vol. 34 ›› Issue (7): 2568-2578.DOI: 10.11733/j.issn.1007-0435.2026.07.020

• 研究论文 • 上一篇    

滇西北高寒草甸生态系统生物源挥发性有机化合物（BVOC）排放的季节特征

高顺心1,2, 田斌1,2, 王树林1,2, 王莲1,2, 李涛3   

  1. 1. 西南林业大学云南省高原湿地保护修复与生态服务重点实验室, 云南 昆明 650224;
    2. 香格里拉普达措国家公园碧塔海高原湿地生态系统云南省野外科学观测研究站, 云南 昆明 650233;
    3. 四川大学教育部生物资源与生态环境重点实验室, 成都市植物园-四川大学山地植物迁地保护与资源利用实验室, 四川大学西南特色生物资源研究与利用四川省重点实验室, 四川 成都 611130
  • 收稿日期:2025-11-11 修回日期:2025-12-31 发布日期:2026-07-02
  • 通讯作者: 李涛，E-mail:tao.li@scu.edu.cn
  • 作者简介:高顺心（1998-），男，汉族，云南曲靖人，硕士研究生，主要从事草地生态与全球变化生态学研究，E-mail:2305247402@qq.com
  • 基金资助:
    青藏高原高寒草甸挥发性有机物排放对放牧强度的响应项目（32271692）；基于光合-挥发物耦合机制的川西高寒草地高碳汇草种资源筛选（2026NSFSC0129）资助

Seasonal Variations of Biogenic Volatile Organic Compound Emissions from An Alpine Meadow Ecosystem in Northwestern Yunnan

GAO Shun-xin1,2, TIAN Bin1,2, WANG Shu-lin1,2, WANG Lian1,2, LI Tao3   

  1. 1. Yunnan Key Laboratory of Plateau Wetland Conservation, Restoration and Ecological Services, Southwest Forestry University, Kunming, Yunnan Province 650224, China;
    2. Shangri-La Potatso National Park Bita Lake Plateau Wetland Ecosystem Observation and Research Station of Yunnan Province, Kunming, Yunnan Province 650233, China;
    3. Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education, Chengdu Botanical Garden-Sichuan University Joint Laboratory for Ex Situ Conservation and Resource Utilization of Mountain Plants, Southwest Bio-resources R&D Key Laboratory of Sichuan Province, College of Life Sciences, Sichuan University, Chengdu, Sichuan Province 611130, China
  • Received:2025-11-11 Revised:2025-12-31 Published:2026-07-02

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摘要： 植物产生和排放的生物源挥发性有机化合物（Biogenic volatile organic compounds，BVOC）在大气中具有高化学反应活性，对大气化学和气候变化有着重要影响，是重要的大气痕量气体。为揭示高寒草甸BVOC排放的季节变化规律及其驱动因素，本研究以滇西北高寒草甸为研究对象，于2024年7—10月采用动态顶空采集系统结合GC/MS技术进行原位监测，并同步记录植被结构与环境因子。结果表明，共检出130余种BVOC，分属异戊二烯、单萜烯等11类。BVOC总排放速率具有显著季节差异，7月最高[（2485.51±847.08） μg·m-2·h-1]，10月最低[（206.27±166.11） μg·m-2·h-1]。7—8月排放以异戊二烯为主（近100%），9—10月排放结构趋于多样化，绿叶气体、倍半萜烯和醛类显著增加。随机森林分析表明，异戊二烯是区分不同月份排放特征的关键化合物。BVOC排放受温度、光照及植被结构的共同影响，高温强光促进异戊二烯排放，低温与植株衰老增强非光依赖型BVOC释放。木里薹草（Carex muliensis）盖度与异戊二烯排放呈显著正相关，伴生种异质性和花期变化提高了BVOC排放多样性。本研究为揭示滇西北高寒草甸与大气交互作用及气候反馈提供了科学依据。

关键词: 生物源挥发性有机化合物, 高寒草甸生态系统, 物候, 季节变化

Abstract: Biogenic volatile organic compound （BVOC） produced and emitted by plants exhibit high chemical reactivity in the atmosphere， exerting significant influence on atmospheric chemistry and climate change. They constitute important atmospheric trace gases. To elucidate the seasonal variation patterns and driving factors of BVOC emissions in alpine meadows， this study employed a dynamic headspace sampling system coupled with GC/MS technology for in situ monitoring in alpine meadows of northwestern Yunnan from July to October 2024， concurrently recording vegetation composition and environmental factors. we detected over 130 BVOCs belonging to 11 classes， including isoprene and monoterpenes. Total BVOC emission rates exhibited pronounced seasonal variation， peaking in July [（2485.51±847.08） μg·m-2·h-1] and reaching a minimum in October [（206.27±166.11） μg·m-2·h-1]. Emissions from July to August were dominated by isoprene （nearly 100%）， while emissions from September to October exhibited greater diversity， with notable increases in green leaf volatiles， sesquiterpenes， and aldehydes. Random forest analysis indicated isoprene as the key compound distinguishing monthly emission patterns. BVOC emissions were jointly influenced by temperature， light intensity， and vegetation structure： high temperatures and strong light promoted isoprene release， whereas low temperatures and plant senescence enhanced non-light-dependent BVOC emissions. Coverage of Carex muliensis was significantly positively correlated with isoprene emissions， while co-occurring species heterogeneity and flowering period variations enhanced BVOC emission diversity. These findings would aid in our understanding of BVOC-driven atmospheric processes and climatic feedbacks within the alpine meadows of northwestern Yunnan.

Key words: Biogenic volatile organic compounds, Alpine meadow ecosystems, Plant phenology, Seasonal variation

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