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Title of Journal: Ecosystems

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Abbravation: Ecosystems

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Springer-Verlag

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DOI

10.1002/hep.26923

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1435-0629

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Exotic Earthworm Invasion and Microbial Biomass

Authors: Peter M Groffman Patrick J Bohlen Melany C Fisk Timothy J Fahey
Publish Date: 2004/01/12
Volume: 7, Issue: 1, Pages: 45-54
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Abstract

Invasion of north temperate forest soils by exotic earthworms has the potential to alter microbial biomass and activity over large areas of North America We measured the distribution and activity of microbial biomass in forest stands invaded by earthworms and in adjacent stands lacking earthworms in sugar mapledominated forests in two locations in New York State USA one with a history of cultivation and thin organic surface soil horizons forest floors and the other with no history of cultivation and a thick 3–5 cm forest floor Earthworm invasion greatly reduced pools of microbial biomass in the forest floor and increased pools in the mineral soil Enrichment of the mineral soil was much more marked at the site with thick forest floors The increase in microbial biomass carbon C and nitrogen N in the mineral soil at this site was larger than the decrease in the forest floor resulting in a net increase in total soil profile microbial biomass in the invaded plots There was an increase in respiration in the mineral soil at both sites which is consistent with a movement of organic matter and microbial biomass into the mineral soil However Ncycle processes mineralization and nitrification did not increase along with respiration It is likely that the earthworminduced input of C into the mineral soil created a microbial “sink” for N preventing an increase in net mineralization and nitrification and conserving N in the soil profile

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  7. Chemical Changes During 6 Years of Decomposition of 11 Litters in Some Canadian Forest Sites. Part 2. 13 C Abundance, Solid-State 13 C NMR Spectroscopy and the Meaning of “Lignin”
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  13. Factors explaining the occurrence of the Siberian flying squirrel in urban forest landscape
  14. Amending soil with used cooking oil to reduce nitrogen losses after cole crop harvest: a 15 N study
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  16. Relative contribution of trees and crops to soil carbon content in a parkland system in Burkina Faso using variations in natural 13 C abundance
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