1. General Model Information

Name: SIGNIWA - SImultion of Grass growth, NItrogen, WAter and phosphorous cycling

Acronym: SIGNIWA


Main medium: terrestrial
Main subject: biogeochemistry, agriculture
Organization level: ecosystem
Type of model: 1D, compartment model
Main application:
Keywords: grassland, grass growth, nitrogen cycle, phosphor cycle, water, decomposition, mineralization, nitrification, leaching, N fixation, immobilization, slurry application, one-dimensional, multilayer, field-scale, weather-driven

Contact:

Dr. Lianhai Wu

Department of Meteorology,
China Agricultural University, West Campus;
Beijing;100094;
PR CHINA

Phone: 86 10 6289 3506
Fax: 86 10 6289 1055
email: lwu@mx.cei.gov.cn

Author(s):

Dr. Lianhai Wu

Abstract:

SIGNIWA is a new dynamic simulation model for grass growth, nitrogen, water and phosphorous cycling in the monoculture and mixture of grass & legume.

The current version mainly focuses on the first two parts, grass growth and nitrogen cycling on the field scale. The processes include photosynthesis, respiration, the allocation of net photosynthesis to leaf, stem and root, leaf death, digestibility which will determine cutting dates and times in a year, decomposition of organic matter, slurry application, mineralization, immobilization, nitrification, denitrification, leaching, plant uptake of nitrogen and N fixation.

Phosphorous and wate movements will be built in in the future versions.

A new Windows version of SIGNIWA, grass growth, nitrogen and water cycling in the monoculture and/or mixture has been released. (01/1999)

Compared to the old version (DOS) released in May, 1997, water and heat simulation have be built in. The processes now include in the model photosynthesis, respiration, the allocation of net photosynthesis to leaf, stem and root, leaf death, digestibility which will determine cutting dates and times in a year, decomposition of organic matter, slurry application, mineralization, immobilization, nitrification, denitrification, leaching, plant uptake of notrogen and N fixation, evapotranspiration, water uptake, ground water and surface pool, snow, water flow in the soil, thermal properties and frost, etc. There are 382 variables which include every aspects of grass growth and development, nitrogen and water cycling, and heat transformation. The SIGNIWA is free of charge to distribute, if you are interested in and would like to recieve this model, please contact Dr. Lianhai Wu.


II. Technical Information

II.1 Executables:

Operating System(s): Windows 95 or later operating system with 8MB memory,
High colour (16 bit), 800x600 or higher resolution and more than 10MB
disk free spaces (highly depending on simulation situation)


II.2 Source-code:

Programming Language(s): FORTRAN & C

II.3 Manuals:

Available on the request

II.4 Data:



III. Mathematical Information


III.1 Mathematics


III.2 Quantities


III.2.1 Input

Time Step: 1 day

III.2.2 Output


IV. References




V. Further information in the World-Wide-Web



VI. Additional remarks



Last review of this document by: Wed May 7 1997
preliminary

Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:49 CEST 2002

Go back to Register of Ecological Models (R E M)