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13C
1
15N
1
Alaska
1
Arctic
1
Brooks Range
1
Picea glauca
1
adult growth rate
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air temperature
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boreal forest advance
1
cone counts
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foliar N
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foliar P
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foliar nutrients
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forest tundra ecotone
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sea ice retreat
seedling growth rate
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seedling to sapling recruitment
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snow
soil moisture
1
soil temperature
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treeline
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white spruce
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winter
1
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