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高温和干旱事件改变了欧洲西南部生物平衡碳预算的能力。

Heat and Drought Events Alter Biogenic Capacity to Balance CO Budget in South-Western Europe.

作者信息

Segura-Barrero R, Lauvaux T, Lian J, Ciais P, Badia A, Ventura S, Bazzi H, Abbessi E, Fu Z, Xiao J, Li X, Villalba G

机构信息

Sostenipra Research Group Institute of Environmental Sciences and Technology Universitat Autònoma de Barcelona (UAB) Barcelona Spain.

Molecular and Atmospheric Spectrometry Group (GSMA)-UMR 7331 University of Reims Champagne Ardenne Reims France.

出版信息

Global Biogeochem Cycles. 2025 Jan;39(1):e2024GB008163. doi: 10.1029/2024GB008163. Epub 2025 Jan 3.

DOI:10.1029/2024GB008163
PMID:39759392
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11696489/
Abstract

Heat and drought events are increasing in frequency and intensity, posing significant risks to natural and agricultural ecosystems with uncertain effects on the net ecosystem CO exchange (NEE). The current Vegetation Photosynthesis and Respiration Model (VPRM) was adjusted to include soil moisture impacts on the gross ecosystem exchange (GEE) and respiration ( ) fluxes to assess the temporal variability of NEE over south-western Europe for 2001-2022. Warming temperatures lengthen growing seasons, causing an increase in GEE, which is mostly compensated by a similar increment in . As a result, there is a modest increase in the net carbon sink of 0.69 gC m yr but with high spatial and annual variability. The heatwave of 2022 reduced net carbon uptake by 91.7 TgC, a 26.4% decrease from the mean. The interannual variability of NEE is more influenced by drought in temperate humid regions than in Mediterranean semi-arid regions. These results emphasize the vulnerability of the net carbon sink as drying trends could revert the NEE trends, as it is happening for croplands in the French Central Massif.

摘要

高温和干旱事件的发生频率和强度不断增加，给自然和农业生态系统带来重大风险，对生态系统净碳交换（NEE）的影响尚不确定。对当前的植被光合作用和呼吸模型（VPRM）进行了调整，纳入土壤湿度对生态系统总交换量（GEE）和呼吸（ ）通量的影响，以评估2001 - 2022年欧洲西南部NEE的时间变异性。气温升高延长了生长季节，导致GEE增加，而这主要被 中类似幅度的增加所抵消。结果，净碳汇略有增加，为0.69 gC m yr，但空间和年度变异性较大。2022年的热浪使净碳吸收量减少了91.7 TgC，比平均水平下降了26.4%。温带湿润地区NEE的年际变异性比地中海半干旱地区受干旱的影响更大。这些结果强调了净碳汇的脆弱性，因为干旱趋势可能会逆转NEE趋势，法国中央高原的农田就正在发生这种情况。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b92a/11696489/62736e5dda09/GBC-39-0-g002.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b92a/11696489/62736e5dda09/GBC-39-0-g002.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b92a/11696489/a8b36d8e2e58/GBC-39-0-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b92a/11696489/f3c3afc77f55/GBC-39-0-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b92a/11696489/bfde9955b7e8/GBC-39-0-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b92a/11696489/79e4d88803de/GBC-39-0-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b92a/11696489/f03e02b23f6d/GBC-39-0-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/b92a/11696489/c6a10e838704/GBC-39-0-g005.jpg
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