Biophysical controls on the interannual variation in carbon fluxes of a natural oak forest

doi:10.1093/jpe/rtaf088

J Plant Ecol ›› 2025, Vol. 18 ›› Issue (5): rtaf088.DOI: 10.1093/jpe/rtaf088

• Research Articles •

Biophysical controls on the interannual variation in carbon fluxes of a natural oak forest

Chongyu Yan^1,2, Shirong Liu^1,2,*, Zhi Chen^3,4, Xiaodong Niu^1,2, Zhicheng Chen^1,2, Xiuqing Nie^1,2, Guirui Yu^3,4,*

¹Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing 100091, China
²Baotianman Forest Ecosystem Research Station, Nanyang, Henan 474350, China
³Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
⁴College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China

^*Corresponding authors. E-mail: liusr@caf.ac.cn (S.L.); yugr@igsnrr.ac.cn (G.Y.)

Online:2025-07-09 Published:2025-10-01
Supported by:
This study was financially supported by the National Key Research and Development Program of China (2021YFD2200405) and the National Natural Science Foundation of China (31930078), and special funds for Baotianman Forest Ecosystem Research Station from Chinese Academy of Forestry and Ministry of Science and Technology of China.

天然栎林碳通量年际变异的生物物理调控机制

Abstract

Abstract: Warm temperate forests have the large potential to sequester atmospheric carbon dioxide (CO₂), while the interannual variability (IAV) of net forest ecosystem carbon exchange (NEE) in the global carbon cycle is still not fully understood. In this study, we conducted eddy-covariance measurement to investigate the IAV of carbon fluxes and concurrent influencing factors in a warm temperate natural oak forest from 2017 to 2022. Our results showed the natural oak forest was a strong CO₂ sink with an increase of 27.79 g C m⁻² a⁻¹ in annual carbon sequestration, resulting from a larger increase in annual gross primary production (GPP) than that of annual ecosystem respiration (Re). Precipitation in spring (PPT_spring) negatively influenced annual GPP, soil water content in spring (SWC_spring) negatively influenced annual Re, while the water conditions had lesser effect on annual NEE attributing to the synchronous changes of annual GPP and annual Re. Increase of temperature in autumn (Ta_autumn) delayed the end date of the growing season, leading to the increase in annual carbon sequestration. In addition, carbon fluxes did not significantly decrease under dramatic reduction of summer precipitation, indicating that warm temperate natural oak forest had a high resistance to seasonal drought. Our study helped us to better understand the mechanisms underlying forest carbon fluxes in response to drought in the context of future climate change.

Key words: carbon fluxes, eddy covariance, environment factors, phenology, interannual variability

摘要：
暖温带森林具有固存大气中二氧化碳(CO₂)的巨大潜力，然而在全球碳循环中，森林净生态系统碳交换(NEE)的年际变异性(IAV)仍未得到充分理解。在本研究中，我们使用涡度协方差法研究了一个暖温带天然栎林2017至2022年期间碳通量的年际变异，并分析了其影响因素。研究结果表明，该天然栎林是一个重要的CO₂汇，其年固碳量以每年27.79 g C m^–2 a^–1的速率增加，这归因于年总初级生产力(GPP)的增加量大于年生态系统呼吸(Re)的增加量。春季降水(PPT_spring)对年GPP有负向影响，春季土壤含水量(SWC_spring)对年Re有负向影响，而水分条件对年NEE的影响较小，这归因于年GPP和年Re的同步变化。秋季温度(Ta_autumn)的升高延迟了生长季的结束日期，从而导致年固碳量的增加。此外，在夏季降水急剧减少的情况下，碳通量并未显著降低，表明暖温带天然栎林对季节性干旱具有较高的抵抗力。本研究有助于我们更好地理解在未来气候变化背景下森林碳通量响应干旱的内在机制。

关键词: 碳通量, 涡度协方差, 环境因素, 物候, 年际变异

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Biophysical controls on the interannual variation in carbon fluxes of a natural oak forest

天然栎林碳通量年际变异的生物物理调控机制

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