Mineral dust as a driver of carbon accumulation in northern latitudes
Artikel i vetenskaplig tidskrift, 2018

Peatlands in northern latitudes sequester one third of the world's soil organic carbon. Mineral dusts can affect the primary productivity of terrestrial systems through nutrient transport but this process has not yet been documented in these peat-rich regions. Here we analysed organic and inorganic fractions of an 8900-year-old sequence from Store Mosse (the "Great Bog") in southern Sweden. Between 5420 and 4550 cal yr BP, we observe a seven-fold increase in net peat-accumulation rates corresponding to a maximum carbon-burial rate of 150 g C m(-2) yr(-1) -more than six times the global average. This high peat accumulation event occurs in parallel with a distinct change in the character of the dust deposited on the bog, which moves from being dominated by clay minerals to less weathered, phosphate and feldspar minerals. We hypothesize that this shift boosted nutrient input to the bog and stimulated ecosystem productivity. This study shows that diffuse sources and dust dynamics in northern temperate latitudes, often overlooked by the dust community in favour of arid and semi-arid regions, can be important drivers of peatland carbon accumulation and by extension, global climate, warranting further consideration in predictions of future climate variability.

Författare

Malin E. Kylander

Stockholms universitet

A. Martinez-Cortizas

Universidade de Santiagode Compostela

Richard Bindler

Umeå universitet

Joeri Kaal

Universidade de Santiagode Compostela

Jenny K. Sjostrom

Stockholms universitet

Sophia V. Hansson

Aarhus Universitet

Noemi Silva-Sanchez

Universidade de Santiagode Compostela

Sarah L. Greenwood

Stockholms universitet

Kerry Gallagher

University of Rennes 1

Johan Rydberg

Umeå universitet

Carl-Magnus Mörth

Stockholms universitet

Sebastien Rauch

Chalmers, Arkitektur och samhällsbyggnadsteknik, Vatten Miljö Teknik

Scientific Reports

2045-2322 (ISSN)

Vol. 8 6876

Ämneskategorier

Geologi

Naturgeografi

Klimatforskning

DOI

10.1038/s41598-018-25162-9

PubMed

29720603

Mer information

Senast uppdaterat

2018-05-23