Λεπτομέρειες βιβλιογραφικής εγγραφής
| Τίτλος: |
Facilitative Effects of Alnus viridis ssp. fruticosa on Betula nana ssp. exilis Growth in Arctic Alaska. |
| Συγγραφείς: |
Drew, Jackson W., Bret‐Harte, Marion Syndonia, Buchwal, Agata, Ruess, Roger |
| Πηγή: |
Ecology & Evolution (20457758); Jun2026, Vol. 16 Issue 6, p1-15, 15p |
| Θεματικοί όροι: |
Birch, Nitrogen fixation, Plant growth, Climate change, Tundra ecology, Dendrochronology, Deciduous plants |
| Γεωγραφικοί όροι: |
Alaska, Arctic regions |
| Περίληψη: |
Arctic deciduous shrubs have responded to warming by increasing cover and extent, but how plant interactions (i.e., facilitation and competition) among deciduous shrub species might influence their climate sensitivities and overall growth remains unclear. Here, we investigate two deciduous shrubs: Betula nana ssp. exilis (dwarf birch) and Alnus viridis ssp. fruticosa (Siberian alder), the Arctic's only tall N‐fixing shrub, to determine how Siberian alder affects the growth of nearby dwarf birch. We harvested dwarf birch shrubs growing 'near' (i.e., within 1 m) and 'away' (≥ 3 m) from Siberian alders growing along the Sagwon Bluffs in Arctic Alaska for dendrochronological analysis. Dwarf birch traits and other site characteristics, including height, leaf N, catkin production, frost damage, and snow depth, were measured at additional sites nearby. We discovered locations 'near' Siberian alder had greater snow depth, which delayed the growing season for nearby dwarf birch, but likely protected them from early‐season frost damage. We estimated that radial growth occurring within 1979–2016 was delayed by 9 days, and peak radial growth was delayed by 2 weeks, for dwarf birch growing 'near' as compared to 'away' from alder. This resulted in different climate sensitivities for dwarf birch between locations. Measures of dwarf birch height, catkin abundance, leaf N, and average growth ring area were greater for plants 'near' alder than those 'away' from alder. This suggests that Siberian alder increased N mineralization and soil N availability under the deeper snowpack. Siberian alder facilitated dwarf birch growth. Through plant–plant interactions, Siberian alder altered the strength and type of stressors dwarf birch experienced, resulting in a change to the seasonality of its radial growth. Therefore, high‐spatial resolution species composition data could be included in vegetation models to predict future tundra growth responses more accurately to a changing climate. [ABSTRACT FROM AUTHOR] |
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| Βάση Δεδομένων: |
Complementary Index |