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Linking soil properties and nematode community composition: effects of soil management on soil food webs

Linking soil properties and nematode community composition: effects of soil management on soil... AbstractThe purported benefits of conservation tillage and continuous cropping inagricultural systems include enhancement of soil ecosystem functions toimprove nutrient availability to crops and soil C storage. Studies relatingsoil management to community structure allow the development ofbioindicators and the assessment of the consequences of management practiceson the soil food web. During one year (December 2003-December 2004), westudied the influence of continuous cropping (CC), intermittent fallow (F),standard tillage (ST) and no tillage (NT) on the nematode assemblage and thesoil food web in a legume-vegetable rotation system in California. The mostintensive systems included four crops during the study period. Tillagepractices and cropping pattern strongly influenced nematode faunalcomposition, and the soil food web, at different soil depths. Managementeffects on nematode taxa depended on their position along thecoloniser-persister (cp) scale and on their trophic roles. At the lastsampling date (December 2004), Mesorhabditis and Acrobeloides werepositively associated with NH+4, while Panagrolaimus and Plectus werenegatively correlated with certain phospholipid fatty acids (PLFA).Microbial-feeders were in general associated with both bacterial and fungalPLFA, microbial biomass C (MBC) by chloroform fumigation-extraction, total Cand N, NH+4 and NO−3, and were most abundant in the surface soil of the NTCCtreatment. Fungal-feeders were more closely related to PLFA markers of fungithan to ergosterol, a purported fungal sterol. Discolaimus, Prionchulus,Mylonchulus and Aporcelaimidae, in contrast, were associated withintermittent fallow and deeper soil layers. The organisms in the higherlevels of the soil food web did not respond to the continuous input of C inthe soil and a long recovery period may be required for appropriate taxa tobe reintroduced and to increase. At the end of the experiment, eachtreatment supported quite different nematode assemblages and soil foodwebs. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nematology Brill

Linking soil properties and nematode community composition: effects of soil management on soil food webs

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Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
1388-5545
eISSN
1568-5411
DOI
10.1163/156854106778877857
Publisher site
See Article on Publisher Site

Abstract

AbstractThe purported benefits of conservation tillage and continuous cropping inagricultural systems include enhancement of soil ecosystem functions toimprove nutrient availability to crops and soil C storage. Studies relatingsoil management to community structure allow the development ofbioindicators and the assessment of the consequences of management practiceson the soil food web. During one year (December 2003-December 2004), westudied the influence of continuous cropping (CC), intermittent fallow (F),standard tillage (ST) and no tillage (NT) on the nematode assemblage and thesoil food web in a legume-vegetable rotation system in California. The mostintensive systems included four crops during the study period. Tillagepractices and cropping pattern strongly influenced nematode faunalcomposition, and the soil food web, at different soil depths. Managementeffects on nematode taxa depended on their position along thecoloniser-persister (cp) scale and on their trophic roles. At the lastsampling date (December 2004), Mesorhabditis and Acrobeloides werepositively associated with NH+4, while Panagrolaimus and Plectus werenegatively correlated with certain phospholipid fatty acids (PLFA).Microbial-feeders were in general associated with both bacterial and fungalPLFA, microbial biomass C (MBC) by chloroform fumigation-extraction, total Cand N, NH+4 and NO−3, and were most abundant in the surface soil of the NTCCtreatment. Fungal-feeders were more closely related to PLFA markers of fungithan to ergosterol, a purported fungal sterol. Discolaimus, Prionchulus,Mylonchulus and Aporcelaimidae, in contrast, were associated withintermittent fallow and deeper soil layers. The organisms in the higherlevels of the soil food web did not respond to the continuous input of C inthe soil and a long recovery period may be required for appropriate taxa tobe reintroduced and to increase. At the end of the experiment, eachtreatment supported quite different nematode assemblages and soil foodwebs.

Journal

Nematology – Brill

Published: Jan 1, 2006

Keywords: SOIL FOOD WEB; FALLOW; NEMATODE SENSITIVITY; COVER CROPS; TILLAGE

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