NDLI: Contrasting impacts of two subtropical earthworm species on leaf litter carbon sequestration into soil aggregates

Content Provider	Springer Nature Link
Author	Wu, Jingtao Li, Hanqing Zhang, Weixin Li, Feng Huang, Jinhua Mo, Qifeng Xia, Hanping
Copyright Year	2017
Abstract	Earthworms influence soil carbon sequestration based on the balance between mineralization and stabilization of litter carbon. However, specific impacts and mechanisms of epi-endogeic or endogeic earthworms on litter carbon sequestration need to be clarified.A 126-day laboratory experiment examined how two ecological group earthworms (Amynthas sp. (epi-endogeic species) and Pontoscolex corethrurus (endogeic species)) with distinct feeding habits influence the dynamics and distribution of $^{13}$C labeled Schima superba carbon leaf litter into soil aggregates. Accordingly, three treatments were set as: (i) soil and litter (CK), (ii) soil, litter, and endogeic earthworms (En), (iii) soil, litter, and epi-endogeic earthworms (Ep). Amynthas sp. significantly increased decomposition rate of litter and soil respiration due to the increase of the total phospholipid fatty acids (PLFAs), bacterial PLFAs, and fungal PLFAs and the direct consumption of leaf litter, while P. corethrurus had no effects on these two aspects. Higher proportion of large macroaggregates (>2000 μm) was generated in the presence of earthworms, with the highest in the treatment with endogeic earthworms. Besides, both the two species increased the proportion of non-labile organic carbon in large macroaggregates, which was conducive to carbon protection. At the end of incubation, the $^{13}$C signatures of soil indicated that the distribution of litter-derived carbon was significantly affected by the consumption and excretion activities of earthworms, with the result that more carbon was sequestrated in large macroaggregates (>2000 μm).Consistent with our hypothesis, Amynthas sp., an epi-endogeic earthworms, could rapidly consume organic residues and stimulate microbial biomass to increase litter decomposition rate and incorporate organic carbon into soil structures, while P. corethrurus, an endogeic earthworms, would stabilize the organic carbon that has been already incorporated into the soil through the formation of large macroaggregates and the transformation of soil organic carbon fractions to more recalcitrant forms.
Starting Page	1672
Ending Page	1681
Page Count	10
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	17
Issue Number	6
e-ISSN	16147480
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2017-01-22
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carbon sequestration Earthworm Ecological group Litter-derived carbon Stable isotope Soil Science & Conservation Environment Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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