1. General Model Information
Name: DenNit
Acronym: DENIT
Main medium: air+terrestrial
Main subject: agriculture, forestry
Organization level: Ecosystem
Type of model: static-algrebraic equation, regression
Main application: simulation/optimisation tool, research
Keywords: ammonium, nitrate, non-linear regression model
Contact:
Sascha Reth
Ingolstaedter Landstr. 1, 85764 Neuherberg, Germany
Phone: +49 (0)89 - 3187 2956
Fax: +49 (0)89 - 3187 4431
email: sascha.reth@gsf.de
Homepage: http://www.gsf.de/eus/staff/reth.html
Author(s):
Sascha Reth, Kerstin Hentschel, Matthias Drösler & Eva Falge
Abstract:
To quantify the effects of soil temperature (Tsoil), and relative soil water
content (RSWC) on soil N2O emission we measured N2O soil
efflux with a closed dynamic chamber in situ in the field and from soil cores
in a controlled climate chamber experiment. Additionally we analysed the
effect of soil acidity, ammonium, and nitrate concentration in the field. The
analysis was performed on three meadows, two bare soils and in one forest. We
identified soil water content, soil temperature, soil nitrogen content, and pH
as the main parameters influencing soil N2O emission. The response
of N2O emission to soil temperature and relative soil water content
was analysed for the field and climate chamber measurements. A non-linear
regression model (DenNit) was developed for the field data to describe
soil N2O efflux as a function of soil temperature, soil moisture, pH
value, and ammonium and nitrate concentration. The model could explain 81% of
the variability in soil N2O emission of all individual field
measurements, except for data with short-term soil water changes, namely
during and up to 2 h after rain stopped. We validated the model with an
independent dataset. For this additional meadow site 73% of the flux
variation could be explained with the model.
II. Technical Information
II.1 Executables:
Operating System(s):
II.2 Source-code:
Programming Language(s):
II.3 Manuals:
II.4 Data:
III. Mathematical Information
III.1 Mathematics
III.2 Quantities
III.2.1 Input
III.2.2 Output
IV. References
Reth, S.; Hentschel, K.; Drösler, M. and Falge, E. (2005): DenNit - Experimental analysis and modelling of soil N2O efflux in response on changes of soil water content, soil temperature, soil pH, nutrient availability and the time after rain event.
Plant and Soil. 272 (1-2), 349-363. (SpringerLink)
V. Further information in the World-Wide-Web
VI. Additional remarks
Last review of this document by: : Fri Sep 22 09:28:28 2006 Reth
Status of the document: Contributed by Sascha Reth
last modified by
Joachim Benz Fri Oct 6 08:56:50 CEST 2006