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| DOI | 10.1093/aob/mcae064 |
| Lethal combination for seedlings: extreme heat drives mortality of drought-exposed high-elevation pine seedlings | |
| 发表日期 | 2024 |
| ISSN | 0305-7364 |
| EISSN | 1095-8290 |
| 英文摘要 | Background and Aims Hotter drought- and biotically driven tree mortality are expected to increase with climate change in much of the western USA, and species persistence will depend upon ongoing establishment in novel conditions or migration to track ecological niche requirements. High-elevation tree species might be particularly vulnerable to increasing water stress as snowpack declines, increasing the potential for adult mortality and simultaneous regeneration failures. Seedling survival will be determined by ecophysiological limitations in response to changing water availability and temperature.Methods We exposed seedlings from populations of Pinus longaeva, Pinus flexilis and Pinus albicaulis to severe drought and concurrent temperature stress in common gardens, testing the timing of drought onset under two different temperature regimes. We monitored seedling functional traits, physiological function and survival.Key Results The combined stressors of water limitation and extreme heat led to conservative water-use strategies and declines in physiological function, with these joint stressors ultimately exceeding species tolerances and leading to complete episodic mortality across all species. Growing conditions were the primary determinant of seedling trait expression, with seedlings exhibiting more drought-resistant traits, such as lower specific leaf area, in the hottest, driest treatment conditions. Water stress-induced stomatal closure was also widely apparent. In the presence of adequate soil moisture, seedlings endured prolonged exposure to high air and surface temperatures, suggesting broad margins for survival.Conclusions The critical interaction between soil moisture and temperature suggests that rising temperatures will exacerbate moisture stress during the growing season. Our results highlight the importance of local conditions over population- and species-level influences in shaping strategies for stress tolerance and resistance to desiccation at this early life stage. By quantifying some of the physiological consequences of drought and heat that lead to seedling mortality, we can gain a better understanding of the future effects of global change on the composition and distribution of high-elevation conifer forests. |
| 英文关键词 | Tree seedling; Pinus; heat stress; water stress; functional traits; water balance |
| 语种 | 英语 |
| WOS研究方向 | Plant Sciences |
| WOS类目 | Plant Sciences |
| WOS记录号 | WOS:001228745800001 |
| 来源期刊 | ANNALS OF BOTANY
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/304364 |
| 作者单位 | Nevada System of Higher Education (NSHE); University of Nevada Reno; Nevada System of Higher Education (NSHE); University of Nevada Reno; Nevada System of Higher Education (NSHE); University of Nevada Reno; United States Department of Agriculture (USDA); United States Forest Service |
| 推荐引用方式 GB/T 7714 | . Lethal combination for seedlings: extreme heat drives mortality of drought-exposed high-elevation pine seedlings[J],2024. |
| APA | (2024).Lethal combination for seedlings: extreme heat drives mortality of drought-exposed high-elevation pine seedlings.ANNALS OF BOTANY. |
| MLA | "Lethal combination for seedlings: extreme heat drives mortality of drought-exposed high-elevation pine seedlings".ANNALS OF BOTANY (2024). |
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