Beech outcompetes spruce as air chemistry shifts
Since 1501, spruce hit water-use saturation under acid rain and drought, while beech kept growing as nitrogen and temperatures rose.
Source
Growth and Assemblage Dynamics of Temperate Forest Tree Species Match Physiological Resilience to Changes in Atmospheric Chemistry
Study at a glance
- Design
- Other — Multi-century tree-ring isotopes and growth chronologies in Šumava old-growth forests
- N
- N=35 · Isotopic dataset: 35 trees spanning ~500 years since 1501 CE
- Population
- European beech, Norway spruce, and silver fir in Šumava mountain forests
- Outcome
- Growth and water-use efficiency under historic acid deposition, N, drought, and warming
Structured fields used in claim comparison tables when every cited study has a complete layer.
What they did
Measured tree-ring δ13C, δ18O, and δ15N plus growth for European beech, Norway spruce, and silver fir in old-growth Šumava mountain forests.
What they found
Spruce showed iWUE saturation and growth declines in acidic, drought-prone periods; beech was resilient to acid deposition; fir growth accelerated once air quality improved; beech is gaining dominance.
The limits
What it doesn't show
Thirty-five trees in one mountain range cannot represent all temperate forests or isolate a single driver experimentally.
Key terms
- iWUE
- Intrinsic water-use efficiency, carbon gained per water lost via stomata.
- δ13C
- Carbon-isotope ratio in rings used to infer gas exchange and iWUE.
- δ15N
- Nitrogen-isotope ratio tracing N sources and availability.
- Acid deposition
- Acidic precipitation from air pollution that stresses trees.
- Ontogeny
- Age-related changes in physiology independent of climate.
- Šumava
- Bohemian/Bavarian Forest mountain range in Central Europe.
Flashcards
Research intelligence for this paper
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Quiz yourself
Ring chronology starts:
Common questions
Start year?
1501 CE.
Species?
Beech, Norway spruce, silver fir.
Isotope trees?
35 sampled over 500 years.
Winner?
European beech gaining dominance.
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