期刊
PLANT AND SOIL
卷 438, 期 1-2, 页码 157-172出版社
SPRINGER
DOI: 10.1007/s11104-019-04011-2
关键词
Nitrogen use efficiency; Northern hardwood forest; Phenology; Plant-soil feedback; Snow manipulation; Winter climate change
资金
- JSPS-KAKENHI [25252026, 26292085, 18H02241]
- Grants-in-Aid for Scientific Research [18H02241, 26292085, 25252026] Funding Source: KAKEN
AimsIn this study, we investigated the effects of reduced snow depth on plant phenology, productivity, nitrogen (N) cycling, and N use in canopy and understory vegetation. We hypothesized that decreased snow depth would hasten the timing of leaf flushing and N uptake in understory vegetation, increasing its N competitive advantage over canopy trees.ResultsSnow removal did not directly affect the phenology of either canopy or understory vegetation. Understory vegetation took up more N in the snow removal plots than in the control plots, particularly in the mid- to late-growing season. Leaf production and N uptake in canopy trees also did not differ between the control and snow removal plots, but N resorption efficiency in the snow removal plots (57.6%) was significantly higher than those in control plots (50.0%).ConclusionsIncreased N uptake by understory plants may induce N limitation in canopy trees, which in turn may cause canopy trees to increase their N use efficiency. Such competitive advantage of understory vegetation over canopy trees against snow reduction may affect N cycling via litter quality and quantity not only just after the growing season but also in subsequent seasons.
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