Evidence for Vegetation Acclimation to Atmospheric Dryness During European Droughts From a Land Surface Model

IF 5.5 2区 地球科学 Q1 ENVIRONMENTAL SCIENCES
Camille Abadie, Fabienne Maignan, Cédric Bacour, Philippe Peylin
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Abstract

Accurately characterizing the response of Gross Primary Production (GPP) and plant transpiration to soil moisture stress is crucial for reliable climate simulations as we expect an increase in drought events. In this study, we used the ORCHIDEE land surface model to investigate how the physiological response of vegetation to soil moisture stress can be refined, focusing on Europe, which has experienced significant droughts. We used in situ GPP and latent heat flux (LE) data from more than 40 sites across various biomes, along with data assimilation techniques, to improve GPP and plant transpiration representations. This work shows that the speed of stomatal closure under soil moisture stress can be refined by incorporating vegetation acclimation to long-term vapor pressure deficit (VPD) conditions. This new drought response results in a greater reduction in GPP root mean square deviation than a response based solely on biome type, achieving an 18% improvement at the site scale, whereas the biome-type-only version shows no improvement. Then, the two model versions show similar performance in simulating LE, with an 8%–9% improvement at the site scale. Projections up to 2100 show that, over Europe, incorporating VPD acclimation results in a vegetation sensitivity to drought with stomatal closure that is 22% lower than a response that only depends on the vegetation type. This study underscores the importance of better understanding and accounting for potential acclimation mechanisms in vegetation response to climate change and extreme events.

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来自陆地表面模式的欧洲干旱期间植被适应大气干燥的证据
随着干旱事件的增加,准确表征初级生产总值(GPP)和植物蒸腾对土壤水分胁迫的响应对于可靠的气候模拟至关重要。在本研究中,我们使用ORCHIDEE地表模型来研究如何细化植被对土壤水分胁迫的生理反应,并以经历过严重干旱的欧洲为研究对象。我们使用了来自不同生物群系的40多个站点的原位GPP和潜热通量(LE)数据,以及数据同化技术来改进GPP和植物蒸腾表征。该研究表明,土壤水分胁迫下的气孔关闭速度可以通过结合植被对长期蒸汽压亏缺(VPD)条件的适应来细化。与仅基于生物群落类型的响应相比,这种新的干旱响应导致GPP均方根偏差的降低幅度更大,在立地尺度上实现了18%的改善,而仅基于生物群落类型的响应则没有任何改善。然后,两个模型版本在模拟LE方面表现出相似的性能,在现场规模上提高了8%-9%。到2100年的预测表明,在欧洲,结合VPD驯化导致植被对干旱的敏感性与气孔关闭比仅取决于植被类型的响应低22%。这项研究强调了更好地理解和解释植被对气候变化和极端事件响应的潜在适应机制的重要性。
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来源期刊
Global Biogeochemical Cycles
Global Biogeochemical Cycles 环境科学-地球科学综合
CiteScore
8.90
自引率
7.70%
发文量
141
审稿时长
8-16 weeks
期刊介绍: Global Biogeochemical Cycles (GBC) features research on regional to global biogeochemical interactions, as well as more local studies that demonstrate fundamental implications for biogeochemical processing at regional or global scales. Published papers draw on a wide array of methods and knowledge and extend in time from the deep geologic past to recent historical and potential future interactions. This broad scope includes studies that elucidate human activities as interactive components of biogeochemical cycles and physical Earth Systems including climate. Authors are required to make their work accessible to a broad interdisciplinary range of scientists.
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