气候变化领域集成服务门户(CCPortal): Twenty years of irrigation acclimation is driven by denser canopies and not by plasticity in twig- and needle-level hydraulics in a Pinus sylvestris forest

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DOI	10.1093/jxb/erae066
	Twenty years of irrigation acclimation is driven by denser canopies and not by plasticity in twig- and needle-level hydraulics in a Pinus sylvestris forest
	Gauthey, Alice; Bachofen, Christoph; Chin, Alana; Cochard, Herve; Gisler, Jonas; Mas, Eugenie; Meusburger, Katrin; Peters, Richard L.; Schaub, Marcus; Tunas, Alex; Zweifel, Roman; Grossiord, Charlotte
发表日期	2024
ISSN	0022-0957
EISSN	1460-2431
起始页码	75
结束页码	10
卷号	75 期号:10
英文摘要	Climate change is predicted to increase atmospheric vapor pressure deficit, exacerbating soil drought, and thus enhancing tree evaporative demand and mortality. Yet, few studies have addressed the longer-term drought acclimation strategy of trees, particularly the importance of morphological versus hydraulic plasticity. Using a long-term (20 years) irrigation experiment in a natural forest, we investigated the acclimation of Scots pine (Pinus sylvestris) morpho-anatomical traits (stomatal anatomy and crown density) and hydraulic traits (leaf water potential, vulnerability to cavitation (Psi(50)), specific hydraulic conductivity (K-s), and tree water deficit) to prolonged changes in soil moisture. We found that low water availability reduced twig water potential and increased tree water deficit during the growing season. Still, the trees showed limited adjustments in most branch-level hydraulic traits (Psi(50) and K-s) and needle anatomy. In contrast, trees acclimated to prolonged irrigation by increasing their crown density and hence the canopy water demand. This study demonstrates that despite substantial canopy adjustments, P. sylvestris may be vulnerable to extreme droughts because of limited adjustment potential in its hydraulic system. While sparser canopies reduce water demand, such shifts take decades to occur under chronic water deficits and might not mitigate short-term extreme drought events.
英文关键词	Acclimation; canopy density; drought; hydraulic conductivity; irrigation; psi(50); Scots pine; tree water deficit
语种	英语
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
WOS记录号	WOS:001189258900001
来源期刊	JOURNAL OF EXPERIMENTAL BOTANY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/297181
作者单位	Swiss Federal Institutes of Technology Domain; Ecole Polytechnique Federale de Lausanne; Swiss Federal Institutes of Technology Domain; Swiss Federal Institute for Forest, Snow & Landscape Research; Swiss Federal Institutes of Technology Domain; ETH Zurich; Universite Clermont Auvergne (UCA); INRAE; Swiss Federal Institutes of Technology Domain; Swiss Federal Institute for Forest, Snow & Landscape Research; Swiss Federal Institutes of Technology Domain; Swiss Federal Institute for Forest, Snow & Landscape Research; University of Basel; University of Innsbruck
推荐引用方式 GB/T 7714	Gauthey, Alice,Bachofen, Christoph,Chin, Alana,et al. Twenty years of irrigation acclimation is driven by denser canopies and not by plasticity in twig- and needle-level hydraulics in a Pinus sylvestris forest[J],2024,75(10).
APA	Gauthey, Alice.,Bachofen, Christoph.,Chin, Alana.,Cochard, Herve.,Gisler, Jonas.,...&Grossiord, Charlotte.(2024).Twenty years of irrigation acclimation is driven by denser canopies and not by plasticity in twig- and needle-level hydraulics in a Pinus sylvestris forest.JOURNAL OF EXPERIMENTAL BOTANY,75(10).
MLA	Gauthey, Alice,et al."Twenty years of irrigation acclimation is driven by denser canopies and not by plasticity in twig- and needle-level hydraulics in a Pinus sylvestris forest".JOURNAL OF EXPERIMENTAL BOTANY 75.10(2024).