1. General Model Information
Name: Model of alkaline grassland ecosystems
Main medium: terrestrial
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: compartment model, ordinary differential equations
Main application: research
Keywords: grassland, soil alkalization, harvest control, soil water, dealkalization, vegetation dynamics, cation movement
Institute of Botany
The Chinese Academy of Science
Beijing 100 044
Phone: (+86)-10-8353831 . 294
MAGE is an area-based model for alkaline grassland ecosystems. It was developed
to address the problems associated with the soil alkalization/dealkalization
processes coupeld with surface vegetation on Songnen Plain, northeast China.
The model gave special consideration to the variation of soil characteristics
such as water retentivity and hydraulic conductivity as functions of surface
vegetation. Vegetation dynamics is modeled as multiple plant species
succession, with competition between species reflected as soil water sharing
and species niche overlapping along soil water and alkali axis. Surface
vegetatin dynamics and optimal harvesting control in light of maximum harvest
subject to system stability can be simulated. MAGE consist of submodels
- the soil water dynamics,
- cation movment and exchange (sodium and calcium cations) and
- the vegetation dynamics.
II. Technical Information
Operating System(s): MS-DOS
III. Mathematical Information
Qiong Gao, Xiusheng Yang, Rui Yun, Chunping Li 1996. MAGE, a dynamic model of alkaline grassland ecosystems with variable soil characteristics.
Ecological Modelling, 93, 19-32.
Qiong Gao, Mei Yu, Chunping Li, Rui Yun 1998. Effects of ground water and harvest intensity on alkaline grassland ecosystem dynamics - a simulation study.
Plant Ecology, 135: 165-176.
V. Further information in the World-Wide-Web
VI. Additional remarks
Last review of this document by: T. Gabele: 07.07. 1997 State of document: -
Status of the document:
last modified by
Joachim Benz Thu Apr 1 18:38:32 CEST 2004