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Succession on subalpine placer mine spoil: Effects of revegetation with Alnus viridis, Alaska, U.S.A.

Arctic, Antarctic, and Alpine Research

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Abstract

Alnus viridis seedlings were planted on placer mine spoil in an Alaskan subalpine watershed to bypass a seedling establishment bottleneck for A. viridis, and to evaluate the interaction between A. viridis and the dominant riparian woody plants, Salix alaxensis and Populus balsamifera. The study area was divided into 11 replicate blocks, each on a homogeneous recontoured spoil pile. Blocks were divided into two 0.01 ha plots, and treatments without (control) and with 84 planted A. viridis seedlings were randomly assigned to plots. After 10 years, the Alnus treatment had a dense stand of A. viridis 1-2 m tall, while the control had fewer, smaller seedlings. Compared to the control, planted A. viridis had a neutral effect on S. alaxensis and inhibited P. balsamifera at the seedling establishment stage, but facilitated the growth of established plants of both species, with many plants overtopping the A. viridis canopy. Compared to the control, S. alaxensis plants in the Alnus treatment had higher levels of foliar N and ??15N values closer to those of A. viridis, indicating the importance of N fixation by A. viridis. Planting A. viridis accelerated the rate of succession by stimulating growth of woody dominants. ?? 2005 Regents of the University of Colorado.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Succession on subalpine placer mine spoil: Effects of revegetation with Alnus viridis, Alaska, U.S.A.
Series title:
Arctic, Antarctic, and Alpine Research
Volume
37
Issue:
3
Year Published:
2005
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Arctic, Antarctic, and Alpine Research
First page:
297
Last page:
303