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<p>Desert ecosystems represent significant potential carbon sinks that contribute substantially to global carbon cycles through persistent low-magnitude CO<sub>2</sub> uptake. However, understanding of carbon exchange processes and their environmental controls in these ecosystems remains limited due to observational data scarcity, which severely constrains accurate global carbon budget assessments. Using eddy covariance (EC) technique measurements from 2012 to 2019 (excluding 2014–2015) in the Badain Jaran Desert, we systematically analyzed the temporal dynamics of net ecosystem CO<sub>2</sub> exchange (NEE) across multiple timescales (half-hourly, daily, monthly) and its environmental drivers. Key findings include: (1) NEE exhibited characteristic diurnal “U-shaped” patterns with daytime carbon uptake and nighttime emissions, showing longest carbon sequestration duration in summer and greatest diurnal amplitude in winter; (2) The desert functioned as a persistent carbon sink, with annual cumulative NEE of -90.67, -113.39, -130.68, and − 175.40&#xa0;g C m<sup>− 2</sup> a<sup>− 1</sup> during 2012.8-2013.7, 2016, 2018, and 2019 respectively, suggesting an intensifying carbon sequestration capacity. Extrapolated to the entire desert (5.216 × 10<sup>4</sup> km<sup>2</sup>), this represents an estimated annual carbon sink of 6.649 × 10<sup>6</sup> t; (3) At half-hourly scales, NEE was primarily regulated by net radiation (<i>R</i><sub><i>n</i></sub>) and surface soil temperature (<i>T</i><sub><i>s</i></sub>); daily variations correlated strongly with <i>R</i><sub><i>n</i></sub>, 30&#xa0;cm soil water content (VWC<sub><i>30</i></sub>), and vapor pressure deficit (VPD); while monthly patterns showed interannual variability in dominant environmental controls. These findings provide crucial insights for understanding desert carbon cycling processes and improving global carbon budget assessments.</p>

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Characteristics and drivers of net ecosystem CO2 exchange in the Badain Jaran Desert

  • 期刊论文

  • 发表日期：

    2026年3月9日

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  • Ping Yang,
  • Hang Zhao,
  • Jinqiao Liu,
  • Qingfan Song,
  • Zhenmin Niu,
  • Nai’ang Wang

摘要

Desert ecosystems represent significant potential carbon sinks that contribute substantially to global carbon cycles through persistent low-magnitude CO2 uptake. However, understanding of carbon exchange processes and their environmental controls in these ecosystems remains limited due to observational data scarcity, which severely constrains accurate global carbon budget assessments. Using eddy covariance (EC) technique measurements from 2012 to 2019 (excluding 2014–2015) in the Badain Jaran Desert, we systematically analyzed the temporal dynamics of net ecosystem CO2 exchange (NEE) across multiple timescales (half-hourly, daily, monthly) and its environmental drivers. Key findings include: (1) NEE exhibited characteristic diurnal “U-shaped” patterns with daytime carbon uptake and nighttime emissions, showing longest carbon sequestration duration in summer and greatest diurnal amplitude in winter; (2) The desert functioned as a persistent carbon sink, with annual cumulative NEE of -90.67, -113.39, -130.68, and − 175.40 g C m− 2 a− 1 during 2012.8-2013.7, 2016, 2018, and 2019 respectively, suggesting an intensifying carbon sequestration capacity. Extrapolated to the entire desert (5.216 × 104 km2), this represents an estimated annual carbon sink of 6.649 × 106 t; (3) At half-hourly scales, NEE was primarily regulated by net radiation (Rn) and surface soil temperature (Ts); daily variations correlated strongly with Rn, 30 cm soil water content (VWC30), and vapor pressure deficit (VPD); while monthly patterns showed interannual variability in dominant environmental controls. These findings provide crucial insights for understanding desert carbon cycling processes and improving global carbon budget assessments.