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| DOI | 10.1186/s13717-024-00486-9 |
| Extreme drought triggers parallel shifts in wood anatomical and physiological traits in upper treeline of the Mediterranean Andes | |
| 发表日期 | 2024 |
| EISSN | 2192-1709 |
| 起始页码 | 13 |
| 结束页码 | 1 |
| 卷号 | 13期号:1 |
| 英文摘要 | BackgroundTreeline ecotones of Mediterranean ecoregions have been affected by the increasing intensity and severity of droughts. Even though the effect of droughts on forest dynamics has been widely documented, knowledge is relatively scarce of how extreme climate episodes affect the hydraulic structure and, therefore, the physiology of woody plants. The Mediterranean Andes have experienced an uninterrupted period of drought since 2010, including an extremely dry year in 2019 with approximately 80% rainfall deficit. Here, we investigated shifts in wood anatomical and physiological traits of Kageneckia angustifolia, an endemic treeline species, in response to this drought period.MethodsWe evaluated the xylem plasticity of three K. angustifolia populations across their natural distribution (31-35 degrees SL) based on anatomical (vessel structure and distribution) and physiological (intrinsic water-use efficiency) variables in the tree rings. We focused on the period 2000-2020 that corresponds to before the megadrought (2000-2007), (ii) megadrought (2008-2018) and (iii) hyperdrought (2019-2020). The variables were annualized and analyzed by linear mixed-effects models.ResultsOur results provide insights to the anatomical and physiological mechanisms underlying the resilience of treeline forests to persistent droughts in central Chile. We found that the extreme drought in 2019-2020 triggered shifts in vessel size and frequency that increased hydraulic safety. These significant shifts in vessel traits occurred in parallel with a decrease in pit aperture area and an increase in water-use efficiency, further increasing the resilience of K. angustifolia to extreme drought stress.ConclusionsOur results revealed coordinated shifts in vessel size and frequency and water-use efficiency in response to the megadrought, thereby reducing vulnerability to hydraulic failure. The apparent resilience of K. angustifolia to extreme droughts suggests that this adaptation to drought stress may increase its ability to tolerate novel climatic conditions of treeline environments of the Mediterranean Andes, although it is not clear whether these adaptations will be sufficient to persist in scenarios that predict intensification of climate stress. Finally, our results provide empirical evidence that integrating wood anatomical and physiological traits facilitates the understanding of resilience mechanisms that treeline forests develop in the face of increasing drought stress. |
| 英文关键词 | Dendro-anatomy; Kageneckia angustifolia; Xylem vulnerability; Drought; Climate change |
| 语种 | 英语 |
| WOS研究方向 | Environmental Sciences & Ecology |
| WOS类目 | Ecology ; Environmental Sciences |
| WOS记录号 | WOS:001159691400001 |
| 来源期刊 | ECOLOGICAL PROCESSES
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/305710 |
| 作者单位 | Universidad Mayor; Universidad Mayor; Universidade de Sao Paulo; Universidade Estadual de Campinas; Universidad Nacional Autonoma de Mexico; Pontificia Universidad Catolica de Valparaiso |
| 推荐引用方式 GB/T 7714 | . Extreme drought triggers parallel shifts in wood anatomical and physiological traits in upper treeline of the Mediterranean Andes[J],2024,13(1). |
| APA | (2024).Extreme drought triggers parallel shifts in wood anatomical and physiological traits in upper treeline of the Mediterranean Andes.ECOLOGICAL PROCESSES,13(1). |
| MLA | "Extreme drought triggers parallel shifts in wood anatomical and physiological traits in upper treeline of the Mediterranean Andes".ECOLOGICAL PROCESSES 13.1(2024). |
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