accumulation of nitrogen and organic matter during primary succession of leymus arenarius dunes on the volcanic island surtsey, iceland
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2014
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Abstract
Initial soil development and enhanced nutrient retention are often important
underlying environmental factors during primary succession. We quantified
the accumulation rates of nitrogen (N) and soil organic matter (SOM) in a
37-year-long chronosequence of Leymus arenarius dunes on the pristine volcanic island Surtsey
in order to illuminate the spatiotemporal patterns in their build-up. The
Leymus dune area, volume and height grew exponentially over time. Aboveground
plant biomass, cover or number of shoots per unit area did not change
significantly with time, but root biomass accumulated with time, giving a
root / shoot ratio of 19. The dunes accumulated on average 6.6 kg N ha−1 year−1,
which was 3.5 times more than is received annually by
atmospheric deposition. The extensive root system of Leymus seems to effectively
retain and accumulate a large part of the annual N deposition, not only
deposition directly on the dunes but also from the adjacent unvegetated
areas. SOM per unit area increased exponentially with dune age, but the
accumulation of roots, aboveground biomass and SOM was more strongly linked
to soil N than time: a 1 g m−2 increase in soil N led on average to a 6 kg C m−2 increase
in biomass and SOM. The Leymus dunes, where most of the N
has been accumulated, will therefore probably act as hot spots for further
primary succession of flora and fauna on the tephra sands of Surtsey.
| Reference Key |
stefansdottir2014biogeosciencesaccumulation
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|---|---|
| Authors | ;G. Stefansdottir;A. L. Aradottir;B. D. Sigurdsson |
| Journal | tetrahedron letters |
| Year | 2014 |
| DOI |
10.5194/bg-11-5763-2014
|
| URL | |
| Keywords |
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