Availability of Organic Carbon for Denitrification of Nitrate in Subsoils and GroundwatersEntry ID: USDA0511
Abstract: The purpose of "Availability of Organic Carbon for
Denitrification of Nitrate in Subsoils and Groundwaters" is to
determine the amounts of organic carbon and nitrate in subsoils
and groundwaters from surface soils under various tillage and
fertilizer treatments, and to assess the ability of denitrifying
microorganisms to utilize organic carbon in subsoils and
groundwaters for denitrification of ... nitrate. The data show that
a source of carbon for nitrate reduction was most limiting to
the rate of denitrification in subsoil. Studies to assess the
factors affecting the availability of leachable organic carbon
from surface soils for denitrification of nitrate in subsoils
showed that only small amounts of soluble carbon are normally
present in surface soils. Moreover, any additional amounts of
soluble C in suface soil that formed by perturbations of the
soil are short-lived.
Collection Organization: Iowa State University
Collection Methodology: Water samples from wells, tile drains
and lysimeters analyzed for nitrate, organic carbon, dissolved
oxygen, and numbers of denitrifying microorganisms. Estimates of
the flux of nitrate and organic carbon from surface soils to
groundwaters obtained by monitoring the amount of drainage water
flowing through tile drains and by determining the nitrate and
organic C, readily mineralizable organic C, and denitrification
capacity. The ability of subsoil samples and water samples from
well, tile drains, and lysimeters to denitrify nitrate studied
by the acetylene blockage technique using highly purified
Collection Frequency: Ongoing.
Update Characteristics: New data are not being collected from
Iowa State University.
Available only as hard copy publication from the data center.
(Click for Interactive Map)
Start Date: 1990-01-01Stop Date: 1996-12-31
AGRICULTURE > SOILS
HUMAN DIMENSIONS > ENVIRONMENTAL IMPACTS > CONTAMINANT LEVELS/SPILLS
HUMAN DIMENSIONS > ENVIRONMENTAL GOVERNANCE/MANAGEMENT > WATER MANAGEMENT
TERRESTRIAL HYDROSPHERE > GROUND WATER > DRAINAGE
TERRESTRIAL HYDROSPHERE > GROUND WATER > GROUNDWATER CHEMISTRY
TERRESTRIAL HYDROSPHERE > SURFACE WATER > DRAINAGE
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > CONTAMINANTS
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > NITROGEN COMPOUNDS
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > ORGANIC MATTER
LAND SURFACE > SOILS > ORGANIC MATTER
LAND SURFACE > SOILS > SOIL CHEMISTRY
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > BIOGEOCHEMICAL CYCLES
Quality The data were collected from replicated experiments (3 replicate
samples per treatment). Statistical tests were performed to test
for statistically significant differences. These tests included
F-test and pair-wise T-tests.
Role: TECHNICAL CONTACT
Email: gmccarty at asrr.arsusda.gov
USDA Agricultural Research Service Environmental Chemistry Laboratory Room 201, Building 007, BARC-West
Province or State: MD
Postal Code: 20705-2350
McCarty, G.W. and Bremner, J.M. 1992. Availability of Organic
Carbon for Denitrification of Nitrate in Subsoils. In Biol.
Fert. Soils 14:219-224.
McCarty, G.W. and Bremner, J.M. 1992. Factors Affecting the
Availability of Organic Carbon for Denitrification of Nitrate in
Subsoils. In Biol. Fert. Soils 15:132-136.
Yeomans, J.C., Bremner, J.M, and McCarty, G.W. 1992.
Denitrification Capacity and Denitrification Potential for
Subsurface Soils. Commun. Soil Sci. Plant Anal. 23:919-927.
Creation and Review Dates
DIF Creation Date: 2005-09-07
Last DIF Revision Date: 2005-09-19