Earthworm Lumbricus terrestris mediated redistribution of C and N into large macroaggregate-occluded soil fractions in fine-textured no-till soils

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Sheehy , J , Nuutinen , V , Six , J , Palojarvi , A , Knuutila , O , Kaseva , J & Regina , K 2019 , ' Earthworm Lumbricus terrestris mediated redistribution of C and N into large macroaggregate-occluded soil fractions in fine-textured no-till soils ' , Applied Soil Ecology , vol. 140 , pp. 26-34 . https://doi.org/10.1016/j.apsoil.2019.04.004

Title: Earthworm Lumbricus terrestris mediated redistribution of C and N into large macroaggregate-occluded soil fractions in fine-textured no-till soils
Author: Sheehy, Jatta; Nuutinen, Visa; Six, Johan; Palojarvi, Ansa; Knuutila, Ossi; Kaseva, Janne; Regina, Kristiina
Contributor organization: Department of Agricultural Sciences
Date: 2019-08
Language: eng
Number of pages: 9
Belongs to series: Applied Soil Ecology
ISSN: 0929-1393
DOI: https://doi.org/10.1016/j.apsoil.2019.04.004
URI: http://hdl.handle.net/10138/329664
Abstract: By processing large quantities of crop residues, earthworms enhance the mineralization of organic matter but have also been shown to stabilize soil organic carbon (SOC) into soil fractions like microaggregates (53-250 mu m) within macroaggregates (> 250 mu m) especially in no-till soils. Our objective was to find direct evidence on the impact of an anecic, soil surface-feeding earthworm, Lumbricus terrestris L., on the redistribution of SOC and soil nitrogen (N) into macroaggregate-occluded soil fractions of boreal soils. We sampled soil (0-5 cm depth) from the middens of L. terrestris (mounds of collected residue and surface casts at the openings of its permanent burrows) and the adjacent non-midden (bulk) soil at three no-till sites in southern Finland: two clayey sites (sites 1-2) and one coarse textured site (site 3). Compared to bulk soil, the soil in L. terrestris middens featured general increase in aggregate size and content of SOC and N within the large macroaggregates (> 2000 mu m) at the clayey sites. The microaggregates within the large macroaggregates had accumulated more SOC and N in the midden soil especially at site 1 where 99% of the difference in total SOC between midden and bulk soil was associated with this type of SOC stabilization. At site 2, the increase in SOC found in the large macroaggregates was counteracted by a decrease in SOC in microaggregates within the small macroaggregates (250-2000 mu m). No differences in SOC stored in soil fractions were found between midden and non-midden soil at the coarse soil site 3 with higher top soil decomposition rate compared to sites 1 and 2. Across the study sites, the total amount of SOC was 6% higher in midden soil compared to the bulk soil. These results suggest L. terrestris mediates the storage of SOC and N into better protected soil fractions in clay soils under boreal conditions.
Subject: 119 Other natural sciences
415 Other agricultural sciences
Earthworms
Carbon sequestration
Nitrogen cycle
Soil aggregation
No-till
ORGANIC-MATTER
MICROAGGREGATE FORMATION
CARBON SEQUESTRATION
NITROGEN
MANAGEMENT
IMPACT
AGROECOSYSTEMS
STABILIZATION
DYNAMICS
CASTS
Peer reviewed: Yes
Rights: cc_by_nc_nd
Usage restriction: openAccess
Self-archived version: acceptedVersion


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