| 青藏高原高寒灌丛2003-2016年生长季的不同月份CO2通量对气温日较差的响应 |
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| 引用本文： | 祝景彬,贺慧丹,李红琴,张法伟,李英年,杨永胜,张光茹,王春雨,罗方林.青藏高原高寒灌丛2003-2016年生长季的不同月份CO2通量对气温日较差的响应[J].生态学报,2020,40(23):8773-8782. |
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| 作者姓名： | 祝景彬 贺慧丹 李红琴 张法伟 李英年 杨永胜 张光茹 王春雨 罗方林 |
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| 作者单位： | 枣庄学院旅游与资源环境学院, 枣庄 277160;洛阳师范学院生命科学学院, 洛阳 471934;中国科学院西北高原生物研究所, 西宁 810001;中国科学院西北高原生物研究所, 西宁 810001;中国科学院高原生物适应与进化重点实验室, 西宁 810001;中国科学院西北高原生物研究所, 西宁 810001;中国科学院大学, 北京 100049 |
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| 基金项目： | 国家重点研发计划项目（2017YFA0604801）；青海省科技基础条件平台项目（2018-ZJ-T09）；国家自然基金面上项目（41877547） |
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| 摘 要： | 全球气候变化引起的气温日较差（ADT）减小，将会对高寒生态系统的碳平衡造成深刻影响。基于涡度相关系统，利用2003-2016年的涡度相关系统观测资料，做了青藏高原高寒灌丛在生长季（6-9月）不同月份的ADT对CO2通量影响的研究。结果表明：2003-2016年的生长季中，最高气温（MaxTa）和最低气温（MinTa）呈先升高后降低的单峰变化趋势，ADT没有呈现明显的变化趋势。逐日总初级生产力（GPP）和生态系统呼吸（Re）呈先增加后降低的单峰趋势，逐日净生态系统CO2交换（NEE）呈先下降后上升的"V"型变化趋势。高寒灌丛在生长季为碳汇，整个生长季总NEE、GPP和Re平均值分别为（-161.2±30.1）、（501.9±60.2）、（340.7±54.4） gCm-2。在高寒灌丛生长季（6-9月）的每个月份，MaxTa、MinTa和ADT分别是GPP（P<0.001）、Re（P<0.001）和NEE（P<0.01）变化的主要控制因子。高寒灌丛的ADT的增大有利于生态系统的碳固持，暗示在未来气候变化背景下ADT的减小将会削弱高寒灌丛生态系统的碳汇能力。
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| 关 键 词： | 青藏高原 灌丛 日较差 CO2通量 生长季 |
| 收稿时间： | 2019/12/26 0:00:00 |
| 修稿时间： | 2020/5/20 0:00:00 |
The Response of CO2 Fluxes in Different Months to the Amplitude of Diurnal Temperature in Alpine Shrubland on the Qinghai-Tibetan Plateau During the Growing Season From 2003 to 2016 |
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| ZHU Jingbin,HE Huidan,LI Hongqin,ZHANG Fawei,LI Yingnian,YANG Yongsheng,ZHANG Guangru,WANG Chunyu,LUO Fanglin.The Response of CO2 Fluxes in Different Months to the Amplitude of Diurnal Temperature in Alpine Shrubland on the Qinghai-Tibetan Plateau During the Growing Season From 2003 to 2016[J].Acta Ecologica Sinica,2020,40(23):8773-8782. |
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| Authors: | ZHU Jingbin HE Huidan LI Hongqin ZHANG Fawei LI Yingnian YANG Yongsheng ZHANG Guangru WANG Chunyu LUO Fanglin |
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| Institution: | College of Tourism, Resources and Environment, Zaozhuang University, Zaozhuang 277160, China;College of Life Sciences, Luoyang Normal University, Luoyang 471934, China;Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810001, China;Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810001, China;Key Laboratory of Adaptation and Evolution of Plateau Biota, Chinese Academy of Sciences, Xining 810001, China;Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810001, China;University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The reduction in the amplitude of diurnal temperature (ADT) caused by global climate change will have a profound effect on the carbon balance of alpine ecosystems. Based on CO2 fluxes measured using the eddy covariance technique, we analyzed the relationship between ADT and CO2 fluxes over an alpine shrubland on the Qinghai-Tibetan Plateau during different months of the growing season from 2003 to 2016. The results showed that the maximum temperature (MaxTa) and minimum temperature (MinTa) exhibited a single peaked trend that first increased and then decreased, whereas ADT failed to exhibit an obvious trend during the growing season from 2003 to 2016. Daily gross primary productivity (GPP) and ecosystem respiration (Re) exhibited a single peaked trend that increased and then decreased, whereas daily net ecosystem CO2 exchange (NEE) showed a v-shaped trend. The alpine shrubland ecosystem is a carbon sink during the growing season, and the seasonal NEE, GPP, and Re were (-161.2 ±30.1), (501.9 ±60.2), (340.7 ±54.4) gCm-2, respectively. During each month of the growing season (June-September) in the alpine shrubland, MaxTa, MinTa, and ADT were the main control factors for daily GPP (P<0.001), Re (P<0.001), and NEE (P<0.01), respectively. The increase in ADT is beneficial to carbon sequestration of the alpine shrubland ecosystem. The results suggest that the decrease in ADT in the future will cripple the carbon sink of the alpine shrubland ecosystem on the Qinghai-Tibetan Plateau. |
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| Keywords: | Qinghai-Tibetan Plateau shrubland amplitude of diurnal temperature CO2 fluxes growing season |
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