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Of mosses and men: Plant succession, soil development and soil carbon accretion in the sub-Arctic volcanic landscape of Hekla, Iceland

Of mosses and men: Plant succession, soil development and soil carbon accretion in the sub-Arctic volcanic landscape of Hekla, Iceland


Titill: Of mosses and men: Plant succession, soil development and soil carbon accretion in the sub-Arctic volcanic landscape of Hekla, Iceland
Höfundur: Vilmundardóttir, Olga Kolbrún   orcid.org/0000-0002-6555-9214
Sigurmundsson, Friðþór Sófus
Pedersen, Gro   orcid.org/0000-0002-1626-0822
Belart, Joaquín M. C.   orcid.org/0000-0002-0853-8935
Kizel, Fadi   orcid.org/0000-0002-0821-296X
Falco, Nicola
Benediktsson, Jon Atli   orcid.org/0000-0003-0621-9647
Gísladóttir, Guðrún   orcid.org/0000-0002-4309-2414
Útgáfa: 2018-10-07
Tungumál: Enska
Umfang: 765-791
Háskóli/Stofnun: Háskóli Íslands
University of Iceland
Svið: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Deild: Líf- og umhverfisvísindastofnun (HÍ)
Institute of Life and Environmental Sciences (UI)
Jarðvísindastofnun (HÍ)
Institute of Earth Sciences (UI)
Rafmagns- og tölvuverkfræðideild (HÍ)
Faculty of Electrical and Computer Engineering (UI)
Birtist í: Progress in Physical Geography: Earth and Environment;42(6)
ISSN: 0309-1333
1477-0296 (eISSN)
DOI: 10.1177/0309133318798754
Efnisorð: Soil carbon stock; Lava chronosequence; Moss thickening rate; Racomitrium lanuginosum; Soil accumulation rate; Soil depth; Tephra deposition; Hraunrennsli; Jarðvegur; Jarðvegsrannsóknir; Gróðurfar; Gjóska; Mosar; Hekla
URI: https://hdl.handle.net/20.500.11815/969

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Tilvitnun:

Vilmundardóttir, O. K., Sófus, F., Møller, G. B., Muñoz-Cobo, J., Kizel, F., Falco, N., … Gísladóttir, G. (2018). Of mosses and men: Plant succession, soil development and soil carbon accretion in the sub-Arctic volcanic landscape of Hekla, Iceland. Progress in Physical Geography: Earth and Environment, 42(6), 765–791. https://doi.org/10.1177/0309133318798754

Útdráttur:

Lava flows pose a hazard in volcanic environments and reset ecosystem development. A succession of dated lava flows provides the possibility to estimate the direction and rates of ecosystem development and can be used to predict future development. We examine plant succession, soil development and soil carbon (C) accretion on the historical (post 874 AD) lava flows formed by the Hekla volcano in south Iceland. Vegetation and soil measurements were conducted all around the volcano reflecting the diverse vegetation communities on the lavas, climatic conditions around Hekla mountain and various intensities in deposition of loose material. Multivariate analysis was used to identify groups with similar vegetation composition and patterns in the vegetation. The association of vegetation and soil parameters with lava age, mean annual temperature, mean annual precipitation and soil accumulation rate (SAR) was analysed. Soil carbon concentration increased with increasing lava age becoming comparable to concentrations found on the prehistoric lavas. The combination of a sub-Arctic climate, gradual soil thickening due to input of loose material and the specific properties of volcanic soils allow for continuing accumulation of soil carbon in the soil profile. Four successional stages were identified: initial colonization and cover coalescence (ICC) of Racomitrium lanuginosum and Stereocaulon spp. (lavas <70 years of age); secondary colonization (SC) – R. lanuginosum dominance (170−700 years); vascular plant dominance (VPD) (>600 years); and highland conditions/retrogression (H/R) by tephra deposition (70−860 years). The long time span of the SC stage indicates arrested development by the thick R. lanuginosum moss mat. The progression from SC into VPD was linked to age of the lava flows and soil depth, which was significantly deeper within the VPD stage. Birch was growing on lavas over 600 years old indicating the development towards birch woodland, the climax ecosystem in Iceland.

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