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Biogeophysical factors inuencing soil respiration and mineral nitrogen content in an old eld soil
 

Summary: Biogeophysical factors in真encing soil respiration and mineral nitrogen
content in an old 容ld soil
M.C. Savina,*, J.H. Gorresa
, D.A. Neherb
, J.A. Amadora
a
University of Rhode Island, Laboratory of Soil Ecology and Microbiology, Department of Natural Resources Science, 210B Woodward Hall, 9 East Alumni
Avenue, Suite 5, Kingston, RI 02881, USA
b
University of Toledo, Department of Biology, 2801 West Bancroft Street, Toledo, OH 43606, USA
Received 31 December 1999; received in revised form 27 June 2000; accepted 20 July 2000
Abstract
Microbivorous grazers are thought to enhance nutrient mineralization. The predicted effect of microbivory on nutrient cycling depends on
the pore habitat model used. We evaluated CO2 evolution and mineral N content of an old 容ld soil to test two alternative habitat hypotheses.
The exclusion hypothesis predicts that nematodes are separated from their microbial food resources in water-峽led pores when soils dry,
resulting in slower rates of biogeochemical transformations. The enclosure hypothesis predicts that nematode densities increase relative to
their forage in smaller, isolated water volumes when soils dry, accelerating rates of biogeochemical transformations. We investigated the
effect of soil moisture on the relationship between microbial biomass, microbivorous and predaceous nematodes, soil respiration and mineral
N concentrations in an old 容ld 師e times during the course of a year.
We could evaluate the validity of the two habitat hypotheses for the entire 容ld only in August 1997 because that was the only sampling

  

Source: Amador, Jos A. - Department of Natural Resources Science, University of Rhode Island
Neher, Deborah A. - Department of Plant and Soil Science, University of Vermont

 

Collections: Environmental Management and Restoration Technologies; Environmental Sciences and Ecology