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Variations of denitrification in a farming catchment area [An article from: Agriculture, Ecosystems and Environment]
Book Details
Author(s)F. Oehler, P. Bordenave, P. Durand
PublisherElsevier
ISBN / ASINB000PDT5QM
ISBN-13978B000PDT5Q7
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Agriculture, Ecosystems and Environment, published by Elsevier in 2007. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
We measured denitrification at 15 sites during 1 year in a agricultural catchment in Brittany, France. Our objective was to assess the relative importance of heterotrophic denitrification on the fate of excess nitrogen at the catchment scale, and to quantify the relative importance of riparian areas on the N"2O emissions. Using the C"2H"2 inhibition technique, denitrification rate on soil core and denitrifying enzyme activity (DEA) were each determined, for samples taken from two soil layers: 0-20 and 20-40cm. Denitrification rates, ranging from 0 to 417mg Nm^-^2d^-^1, were significantly higher in riparian areas than for hillslopes (median of 24.87 against 10.38mg Nm^-^2d^-^1). However, since denitrification rates are significant in the hillslope and given that hillslope surface area is much greater (79% of catchment surface), this domain could be responsible for half of the overall denitrified nitrogen (N). Also, the 20-40cm deep soil layer was found to account for more than 46% of the denitrification. The DEA indicates the potential for denitrifying activity by the soil under non-limiting conditions, measured values ranged from 76.48 to 530.63ng Ng^-^1dry soilh^-^1. The ratio N"2O/(N"2O+N"2) was about 60% with no clear spatial or temporal trends. Soil moisture appeared to be the main limiting factor for denitrification at the field scale. The results suggest that, for this catchment, denitrification is a major route for nitrogen removal, but a significant proportion of this removal occurs as N"2O.
Description:
We measured denitrification at 15 sites during 1 year in a agricultural catchment in Brittany, France. Our objective was to assess the relative importance of heterotrophic denitrification on the fate of excess nitrogen at the catchment scale, and to quantify the relative importance of riparian areas on the N"2O emissions. Using the C"2H"2 inhibition technique, denitrification rate on soil core and denitrifying enzyme activity (DEA) were each determined, for samples taken from two soil layers: 0-20 and 20-40cm. Denitrification rates, ranging from 0 to 417mg Nm^-^2d^-^1, were significantly higher in riparian areas than for hillslopes (median of 24.87 against 10.38mg Nm^-^2d^-^1). However, since denitrification rates are significant in the hillslope and given that hillslope surface area is much greater (79% of catchment surface), this domain could be responsible for half of the overall denitrified nitrogen (N). Also, the 20-40cm deep soil layer was found to account for more than 46% of the denitrification. The DEA indicates the potential for denitrifying activity by the soil under non-limiting conditions, measured values ranged from 76.48 to 530.63ng Ng^-^1dry soilh^-^1. The ratio N"2O/(N"2O+N"2) was about 60% with no clear spatial or temporal trends. Soil moisture appeared to be the main limiting factor for denitrification at the field scale. The results suggest that, for this catchment, denitrification is a major route for nitrogen removal, but a significant proportion of this removal occurs as N"2O.
