灌丛草地生态系统非生长季碳通量及影响因素  

Net Ecosystem CO_(2)Exchange in the Shrubland-grassland Ecosystem During the Non-growing Season and Its Influencing Factors

作　　者：李青青 甘永德 刘艳强 孙君文 吴玉帅[1] 靳润芳 LI Qingqing;GAN Yongde;LIU Yanqiang;SUN Junwen;WU Yushuai;JIN Runfang(School of Civil Engineering and Water Resources,Qinghai University,Xining 810016,China;Henan Water Conservancy Survey,Design and Research Co.,Ltd.,Zhengzhou 450000,China)

机构地区：[1]青海大学土木水利学院,青海西宁810016 [2]河南省水利勘测设计研究有限公司,河南郑州450000

出　　处：《环境科学与技术》2025年第3期1-9,共9页Environmental Science & Technology

基　　金：国家重点研发计划项目(2023YFC3206303);水联网联合开放基金项目(sklhse-2023-Iow07)。

摘　　要：湟水河流域分布着广泛的灌丛草地,其非生长季碳收支平衡对整个生态系统具有重要意义,但目前对灌丛草地生态系统非生长季碳通量的动态变化及其与环境因子间的关系知之甚少。因此,该研究基于涡度观测系统,探讨湟水河流域灌丛草地生态系统碳通量特征及其主要影响因子。研究结果表明:研究区非生长季净生态系统碳交换量(NEE)呈明显的“U”型变化曲线,白天多为碳吸收,夜间为碳排放,日间碳吸收峰值出现在12:00-15:00之间,研究期间各月累计NEE均为负值。研究期间温度(空气温度、土壤温度)、相对湿度、饱和水汽压差和光合有效辐射均对NEE产生显著影响。此外,灌丛草地生态系统对温度较为敏感,在整个非生长季光合作用均较为明显,整个非生长季灌丛草地生态系统NEE累计为-376.938 g CO_(2)/m^(2),是一个弱的碳汇。The non-growing season carbon budget balance is of great significance to the whole ecosystem.However,there is limited knowledge regarding the dynamic alterations of carbon flux in the non-growing season and its association with envi⁃ronmental factors.Therefore,based on vorticity observation system,this study discussed the carbon flux characteristics and main influencing factors of shrub grassland ecosystem in the Huangshui River.The results showed that the non-growing sea⁃son net ecosystem carbon exchange(NEE)in the study area showed an obvious U-shaped change curve,with carbon uptake in the daytime and carbon emission at night.The peak of carbon uptake in the daytime occurred between 12:00 and 15:00,and the cumulative NEE was negative in all months during the study period.During the study period,temperature(air tempera⁃ture,soil temperature),relative humidity,saturated vapor pressure difference,light and effective radiation all had significant effects on NEE.In addition,the shrub grassland ecosystem was more sensitive to temperature and photosynthesis was obvious in the whole non-growing season.The total NEE of the shrub grassland ecosystem in the whole non-growing season was-376.938 g CO_(2)/m^(2),which was a weak carbon sink.

关 键 词：涡度相关 碳通量 灌丛草地 非生长季 影响因子 

分 类 号：X171.1[环境科学与工程—环境科学]