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Release of Carbon in Different Molecule Size Fractions from Decomposing Boreal Mor and Peat as Affected by Enchytraeid Worms.

Authors :
Lappalainen, Mari
Palviainen, Marjo
Kukkonen, Jussi V.K.
Setälä, Heikki
Piirainen, Sirpa
Sarjala, Tytti
Koivusalo, Harri
Finér, Leena
Launiainen, Samuli
Laurén, Ari
Source :
Water, Air & Soil Pollution; Jul2018, Vol. 229 Issue 7, p1-1, 1p
Publication Year :
2018

Abstract

Terrestrial export of dissolved organic carbon (DOC) to watercourses has increased in boreal zone. Effect of decomposing material and soil food webs on the release rate and quality of DOC are poorly known. We quantified carbon (C) release in CO<subscript>2</subscript>, and DOC in different molecular weights from the most common organic soils in boreal zone; and explored the effect of soil type and enchytraeid worms on the release rates. Two types of mor and four types of peat were incubated in laboratory with and without enchytraeid worms for 154 days at + 15 °C. Carbon was mostly released as CO<subscript>2</subscript>; DOC contributed to 2-9% of C release. The share of DOC was higher in peat than in mor. The release rate of CO<subscript>2</subscript> was three times higher in mor than in highly decomposed peat. Enchytraeids enhanced the release of CO<subscript>2</subscript> by 31-43% and of DOC by 46-77% in mor. High molecular weight fraction dominated the DOC release. Upscaling the laboratory results into catchment level allowed us to conclude that peatlands are the main source of DOC, low molecular weight DOC originates close to watercourse, and that enchytraeids substantially influence DOC leaching to watercourse and ultimately to aquatic CO<subscript>2</subscript> emissions. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00496979
Volume :
229
Issue :
7
Database :
Complementary Index
Journal :
Water, Air & Soil Pollution
Publication Type :
Academic Journal
Accession number :
131011322
Full Text :
https://doi.org/10.1007/s11270-018-3871-5