云贵高原草地生态系统CO2通量变化特征

doi:10.11686/cyxb2019410

草业学报 ›› 2020, Vol. 29 ›› Issue (4): 184-191.DOI: 10.11686/cyxb2019410

云贵高原草地生态系统CO₂通量变化特征

孙思思¹, 吴战平¹, 肖启涛^2,*, 于飞¹, 古书鸿³, 方荻¹, 李浪¹, 赵兴炳⁴

1.贵州省山地环境气候研究所,贵州省山地气候与资源重点实验室,贵州贵阳 550002;
2.中国科学院南京地理与湖泊研究所,中国科学院流域地理学重点实验室,江苏南京210008;
3.贵州省遵义市气象局,贵州遵义 563099;
4.中国气象局成都高原气象研究所,四川成都 610072

收稿日期:2019-09-18 修回日期:2019-11-11 出版日期:2020-04-20 发布日期:2020-04-20
通讯作者: E-mail: qtxiao@niglas.ac.cn
作者简介:孙思思(1990-),女,江苏无锡人,博士。E-mail: sunsisi444246@cma.cn
基金资助:
中国气象局气候变化专项(CCSF201915),国家自然科学基金(41801093)和成都高原气象研究所科研项目资助

Factors influencing CO₂ fluxes of a grassland ecosystem on the Yunnan-Guizhou Plateau, China

SUN Si-si¹, WU Zhan-ping¹, XIAO Qi-tao^2,*, YU Fei¹, GU Shu-hong³, FANG Di¹, LI Lang¹, ZHAO Xing-bing⁴

1.Guizhou Institute of Mountainous Environment and Climate, Guizhou Key Laboratory of Mountainous Climate and Resources, Guiyang 550002, China;
2.Key Laboratory of Watershed Geographic Science, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;
3.Meteorological Administration in Zunyi City, Zunyi 563099, China;
4.Institute of Plateau Meteorology, CMA, Chengdu 610072, China

Received:2019-09-18 Revised:2019-11-11 Online:2020-04-20 Published:2020-04-20
Contact: E-mail: qtxiao@niglas.ac.cn

摘要/Abstract

摘要： 草地是云贵高原的重要植被类型,与其他地区研究相比,该地区草地生态系统的CO₂交换过程和驱动机理的研究较为薄弱。基于涡度相关系统对云贵高原草地生态系统观测的连续高频数据(2017年10月-2018年8月),分析了该生态系统CO₂通量的时间变化特征及其环境影响因素。结果表明:日尺度上CO₂通量具有显著的变化特征,为明显的单峰型变化,白天净吸收,夜晚净排放。季节尺度上,每月均为碳吸收,吸收速率呈春夏高,秋冬低的特征,吸收峰值出现在6月,最低值在1月,且生长季的碳吸收变化幅度比非生长季大。影响CO₂通量变化的主要环境因子有太阳辐射、气温、土壤温度和风速,综上,云贵高原草地生态系统CO₂通量对温度较为敏感,温度升高可提高其固碳能力。总的来看,该生态系统是一个明显的碳汇,研究时段内净碳吸收量为425.14 g CO₂·m^-2。

关键词: 云贵高原, 草地生态系统, CO₂通量, 环境因子

Abstract: Grassland is a dominant vegetation type on the Yunnan-Guizhou Plateau, and comparatively little is known about the CO₂ flux and its diurnal and seasonal variation. Based on in-situ measurement using eddy covariance methodology from October 2017 to August 2018, the diurnal cycle and seasonal variations of CO₂ flux for a grassland ecosystem of Yunnan-Guizhou Plateau were analyzed, and key factors determining CO₂ flux were determined. The CO₂ flux had obvious diurnal variation, with net uptake during the day and net emission at night, and the diurnal cycle being more significant in growing season than in the non-growing season. Overall, the grassland ecosystem was a sink of atmospheric CO₂, which also varied seasonally with high uptake rate in spring and summer and low rate in autumn and winter. Specifically, the peak CO₂ uptake rate occurred in June and lowest was observed in January. The diurnal and seasonal variation in the CO₂ flux were associated with solar radiation, air temperature, soil temperature and wind speed fluctuations. Global warming would enhance the carbon sequestration capacity of the grassland ecosystem, given the CO₂ flux was sensitive to temperature. Our results suggested that the grassland ecosystem acted as carbon sink and absorbed 425.14 g CO₂·m^-2 from the atmosphere during the study period.

Key words: Yunnan-Guizhou Plateau, grassland ecosystem, CO₂ flux, environmental factors

孙思思, 吴战平, 肖启涛, 于飞, 古书鸿, 方荻, 李浪, 赵兴炳. 云贵高原草地生态系统CO₂通量变化特征[J]. 草业学报, 2020, 29(4): 184-191.

SUN Si-si, WU Zhan-ping, XIAO Qi-tao, YU Fei, GU Shu-hong, FANG Di, LI Lang, ZHAO Xing-bing. Factors influencing CO₂ fluxes of a grassland ecosystem on the Yunnan-Guizhou Plateau, China[J]. Acta Prataculturae Sinica, 2020, 29(4): 184-191.

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云贵高原草地生态系统CO₂通量变化特征

Factors influencing CO₂ fluxes of a grassland ecosystem on the Yunnan-Guizhou Plateau, China

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