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Earthworms facilitate carbon sequestration through unequal amplification of carbon stabilization compared with mineralization.

Abstract：

:A recent review concluded that earthworm presence increases CO₂ emissions by 33% but does not affect soil organic carbon stocks. However, the findings are controversial and raise new questions. Here we hypothesize that neither an increase in CO₂ emission nor in stabilized carbon would entirely reflect the earthworms' contribution to net carbon sequestration. We show how two widespread earthworm invaders affect net carbon sequestration through impacts on the balance of carbon mineralization and carbon stabilization. Earthworms accelerate carbon activation and induce unequal amplification of carbon stabilization compared with carbon mineralization, which generates an earthworm-mediated 'carbon trap'. We introduce the new concept of sequestration quotient to quantify the unequal processes. The patterns of CO₂ emission and net carbon sequestration are predictable by comparing sequestration quotient values between treatments with and without earthworms. This study clarifies an ecological mechanism by which earthworms may regulate the terrestrial carbon sink.

journal_name

Nat Commun

journal_title

Nature communications

authors

Zhang W,Hendrix PF,Dame LE,Burke RA,Wu J,Neher DA,Li J,Shao Y,Fu S

doi

10.1038/ncomms3576

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

2576

issn

2041-1723

pii

ncomms3576

journal_volume

4

pub_type

杂志文章

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