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Alaska
14
Arctic
14
boreal forest advance
foliar nutrients
14
forest tundra ecotone
14
snow
14
treeline
14
white spruce
14
invasion
13
13C
1
15N
1
Brooks Range
1
Picea glauca
1
adult growth rate
1
air temperature
1
cone counts
1
foliar N
1
foliar P
1
sea ice retreat
1
seedling growth rate
1
seedling to sapling recruitment
1
soil moisture
1
soil temperature
1
winter
1
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