青藏高原高寒矮嵩草草甸大气CO_(2)浓度时间变化特征  

The Temporal Variations of Atmospheric CO_(2) Concentration of an Alpine Kobresia Meadow Over the Qinghai-Tibetan Plateau

作　　者：李红琴 刘晗[1] 张法伟 Li Hongqin;Liu Han;Zhang Fawei(College of Life Sciences,Luoyang Normal University,Luoyang 471934,Henan,China;Institute of Sanjiangyuan National Park,Chinese Academy of Sciences,Xining 810008,Qinghai,China)

机构地区：[1]洛阳师范学院生命科学学院,河南洛阳471934 [2]中国科学院三江源国家公园研究院,青海西宁810008

出　　处：《农业技术与装备》2021年第5期137-138,共2页Agricultural Technology & Equipment

摘　　要：大气CO_(2)浓度的持续升高所导致的全球气候变化已成为人类社会所面临的重大危机,准确获取CO_(2)浓度的时空格局是科学评估气候演变的重要基础。文章利用涡度相关技术,连续高频(10 Hz)地观测青藏高原东北隅高寒矮嵩草草甸的大气CO_(2)浓度,以期获取其变化特征。2019年—2020年的结果表明大气CO_(2)浓度的平均日变化在生长季为U型,在非生长季表现为夜间较高白天较低的特征。大气CO_(2)浓度年均值为(395.4±37.3)×10^(-6),在1月相对最高(418.8±9.1)×10^(-6),在6月相对最低(378.0±44.9)×10^(-6),由于冻土消融导致4月出现一个小高峰(407.6±12.9)×10^(-6)。因此,高寒草甸CO_(2)浓度变化是群落光合、系统呼吸及土壤冻融的综合结果。The continuous increase in atmospheric CO_(2) concentration has caused global climate changes,which have become a major crisis for human society.Accurately obtaining the spatiotemporal patterns of atmospheric CO_(2) concentration is an important basis for scientific assessment of climate development.In this paper,the eddy correlation technology is used to continuously observe the atmospheric CO_(2) concentration at a high frequency(10 Hz)of an alpine Kobresia humilis meadow in the northeastern Qinghai-Tibet Plateau in order to obtain its temporal patterns.The data from 2019 to 2020 show that the average diurnal change of atmospheric CO_(2) concentration is U-shaped in the growing season,and it is a little complicated with a higher concentration during the night and lower values during the day in the non-growing season.The annual average atmospheric CO_(2) concentration was(395.4±37.3)×10^(-6),which was highest in January(418.8±9.1)×10^(-6) and lowest in June(378.0±44.9)×10^(-6).Due to the melting of frozen soil,there was a small CO_(2) concentration peak in April(407.6±12.9)×10^(-6).Therefore,the temporal pattern of atmospheric CO_(2) concentration in the alpine meadow is jointly controlled by vegetation photosynthesis,ecosystem respiration,and soil freezing and thawing.

关 键 词：大气CO_(2)浓度 高寒矮嵩草草甸 涡度相关系统 青藏高原 变化特征 

分 类 号：P185.16[天文地球—天文学]