No full text
Poster (Scientific congresses and symposiums)
TEMPORAL VARIABILITY OF N2O FLUXES FROM A FERTILIZED GRASSLAND: PRELIMINARY RESULTS FROM DYNAMIC CLOSED CHAMBERS
Beekkerk van Ruth, Jöran; Moureaux, Christine; Degré, Aurore et al.
2013EGU: general assembly
 

Files


Full Text
No document available.
Full Text Parts
EGU2013-3211-1.pdf
Publisher postprint (55.6 kB)
Download
Poster_N2O_joran_2.pdf
Publisher postprint (2.58 MB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
grassland; N2O; chamber method; fertilizer
Abstract :
[en] This work presents preliminary results of nitrous oxide (N2O) fluxes measured by dynamic closed chambers from a fertilized grassland grazed by the Belgian Blue breed of cattle. It is part of a project funded by the public service of Wallonia (SPW-DGARNE), whose objectives are to make a carbon/CO2 balance of the grassland (Jérôme et al., 2013) and to quantify CH4 (Dumortier et al., 2013) and N2O fluxes. The site is located in Dorinne (Dorinne Terrestrial Observatory), Belgium (50° 18’ 44” N; 4° 58’ 07” E; 248 m al.). It is a permanent grassland of ca. 4.2 ha with a moderate slope of 1 to 2 %. Mineral fertilisation took place in March and May 2012. Two cylindrical chambers of 19,2 cm diameter and 11,5 cm height were placed inside a protected area around a micrometeorological station. An infrared gas analyser (Thermofischer 46i) was used in order to measure the N2O concentrations inside of the chambers, closed by automatically controlled lids and ventilated by a constant air flow of 1liter/min. These devices were completed by adjacent soil humidity and temperature sensors. The first measurement campaign took place during June and July 2012. The chambers were installed in the field and N2O fluxes were followed without manipulation. N2O fluxes were characterised by a background emission (between 2 and 10 ngN.m2s􀀀1) on which intense but time limited peaks (between 50 and 300 ngN.m2s􀀀1) superimposed. Peaks were found to be mainly linked to fertilisation and driven by precipitation. Background fluxes were found to correlate positively with soil temperature. Secondly, a manipulation experiment took place in November 2012: two different fertilizer treatments were applied to the chambers. Doses of respectively 100 and 200 kg N/ha of ammonium nitrate were sprayed in the chambers (equivalent to a 8mmprecipitation). N2O fluxes peaked shortly after fertiliser application (respectively 300 and 550 ngN.m2s􀀀1), as well as after a posterior rain event (respectively 800 and 1500 ngN.m2s􀀀1). The peak dynamics suggests a complex interaction between soil humidity and nitrogen availability, which is under study. Dumortier et al., Geophysical Research Abstracts, Vol. 15, EGU2013-2083-1, 2013 Jérôme et al., Geophysical Research Abstracts Vol. 15, EGU2013-6989, 2013
Disciplines :
Environmental sciences & ecology
Author, co-author :
Beekkerk van Ruth, Jöran ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Physique des bio-systèmes
Moureaux, Christine ;  Université de Liège - ULiège > Sciences agronomiques > Phytotechnie des régions tempérées
Degré, Aurore  ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Systèmes Sol-Eau
Jerome, Elisabeth ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Physique des bio-systèmes
Beckers, Yves  ;  Université de Liège - ULiège > Sciences agronomiques > Zootechnie
Bodson, Bernard ;  Université de Liège - ULiège > Sciences agronomiques > Phytotechnie des régions tempérées
Aubinet, Marc ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Physique des bio-systèmes
Language :
English
Title :
TEMPORAL VARIABILITY OF N2O FLUXES FROM A FERTILIZED GRASSLAND: PRELIMINARY RESULTS FROM DYNAMIC CLOSED CHAMBERS
Publication date :
09 April 2013
Event name :
EGU: general assembly
Event date :
09/04/1013
Audience :
International
Available on ORBi :
since 23 May 2013

Statistics


Number of views
180 (17 by ULiège)
Number of downloads
99 (13 by ULiège)

Bibliography


Similar publications



Contact ORBi