生物源挥发性有机物(Biogenic volatile organic compounds, BVOC)对全球气候变化和大气化学过程具有重要影响。最近几十年，青藏高原经历了显著的气候变暖。虽然已有很多生态系统碳循环的研究，但是高寒草地BVOC排放动态及其对气候变暖的响应机制尚不明确。本项目拟以青藏高原高寒草甸为研究对象，结合不同海拔梯度原土移位增温实验，利用BVOC研究的最新监测技术，试图：1)阐明增温条件下，BVOC的相对含量、化学组成和排放速率的变化；2)探讨植物和土壤源BVOC对生态系统BVOC排放的贡献及其对增温的响应；3)综合分析植物、土壤、微生物和环境等因子驱动高寒草甸BVOC排放动态的机制。本研究将有助于预测未来气候变暖背景下高寒草甸BVOC排放的动态变化，结果将为评估高寒草地生态系统对气候变化的响应提供科学基础。

Biogenic volatile organic compounds (BVOC) have significant effect on global climate change and atmospheric chemical processes. The Tibetan Plateau has experienced significant warming during the past decades. Despite many studies on ecosystem carbon cycling processes, BVOC emission and its response to climate warming in the alpine grassland ecosystem remain poorly studied. In this project, we combine an in situ soil-warming experiment by transplanting grassland mesocosms from higher altitudes to lower altitudes and the cutting-edge techniques of BVOC monitoring to investigate BVOC emission dynamics. Specially, we aim to 1) clarify the variation of the relative concentration, chemical composition, and emission rate of BVOC under various warming conditions; 2) investigate the relative contribution of plant and soil to the ecosystem BVOC emission in response to the warming conditions; and 3) reveal the mechanisms underlying the BVOC emission by integrative analysis of plants, soil and microbes. This study will benefit our projection of BVOC emission from alpine meadow ecosystems in response to climate warming, and the results will provide scientific basis for assessing the response of the alpine grassland ecosystem to climate change on the Tibetan Plateau.