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Spring phenological escape is critical for the survival of temperate tree seedlings
Functional Ecology ( IF 5.2 ) Pub Date : 2021-05-09 , DOI: 10.1111/1365-2435.13821
Benjamin R. Lee 1 , Inés Ibáñez 1
Affiliation  

  1. Understorey plants in deciduous forests often rely on access to ephemeral light availability before the canopy closes in spring and after the canopy reopens in fall, a strategy commonly referred to as phenological escape. Although there is evidence for a relationship between understorey plant phenology and demographic performance, a mechanistic link is still missing.
  2. In this study, we bridged this gap by estimating annual carbon assimilation as a function of foliar phenology and photosynthetic capacity for seedlings of two temperate tree species that commonly co-occur across eastern North America. We then modelled the relationship between estimated carbon assimilation and observed seedling survival and growth.
  3. Our results indicate that seedlings of both species strongly depend on spring phenological escape to assimilate the majority of their annual carbon budget and that this mechanism significantly affects their likelihood of survival (but not growth). Foliar desiccation also played a strong role in driving patterns of seedling survival, suggesting that water availability will also help shape seedling recruitment dynamics. We found only weak associations between seedling senescence in fall and annual carbon assimilation, suggesting that phenological escape in fall plays a relatively minor role in seedling demographic performance.
  4. Our results indicate that spring phenological escape is critical for survival of these temperate tree species, and thus, any changes to this dynamic associated with climate change could strongly impact these species' recruitment.


中文翻译:

春季物候逃逸对温带树苗成活至关重要

  1. 落叶林中的下层植物通常依赖于在春季树冠关闭之前和秋季树冠重新开放之后获得短暂的光照,这种策略通常被称为物候逃逸。尽管有证据表明下层植物物候与人口统计性能之间存在关系,但仍然缺少机械联系。
  2. 在这项研究中,我们通过估计年碳同化作为叶片物候和光合能力的函数来弥合这一差距,这两种温带树种通常在北美东部共同出现。然后我们对估计的碳同化与观察到的幼苗存活和生长之间的关系进行建模。
  3. 我们的结果表明,这两个物种的幼苗强烈依赖春季物候逃逸来吸收其大部分年度碳预算,并且这种机制显着影响它们的生存(但不影响生长)的可能性。叶面干燥在驱动幼苗存活模式方面也发挥了重要作用,这表明可用水量也将有助于塑造幼苗补充动态。我们发现秋季幼苗衰老与年度碳同化之间只有微弱的关联,这表明秋季的物候逃逸在幼苗人口统计性能中的作用相对较小。
  4. 我们的结果表明,春季物候逃逸对于这些温带树种的生存至关重要,因此,与气候变化相关的这种动态的任何变化都可能强烈影响这些物种的补充。
更新日期:2021-05-09
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