Rangeland Ecology & Management

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Sustainability of Inner Mongolian grasslands: application of the Savanna model
Author
Christensen, L.
Coughenour, M. B.
Ellis, J. E.
Chen, Z.
Publisher
Society for Range Management
Publication Year
2003-07-01
Body

The sustainability and resilience of an Asian typical steppe grazing ecosystem was assessed by determining thresholds and stable states with an ecosystem simulation model. This analysis used the Savanna model to simulate spatial climate, vegetation, and livestock grazing dynamics, at 14 different stocking rates (5.5-59.8 AUY km-2). Grazing effects on vegetation were assessed, including effects on primary production, vegetation composition, and root biomass. Simulations were run for 100 years: 50 years to examine sustainability and 50 years to examine resilience of the system. Results showed that a grazing intensity (1-g/u; g = biomass in grazed area, u = biomass in ungrazed area) of 0.49 was sustainable for this particular system. This region was resilient to grazing up to the intensity of 0.49, where the system remained dominated by herbaceous production. Grazing intensities higher than 0.49, in combination with low precipitation events, resulted in decreased herbaceous net primary production and root biomass, and increased shrub net primary production and root biomass. Herbaceous vegetation was unable to gain a competitive advantage over shrubs in areas where grazing intensities were above 0.49; consequently, the system shifted to a stable shrub-dominated state that could not return its original composition even without further grazing. The Journal of Range Management archives are made available by the Society for Range Management and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information. Migrated from OJS platform August 2020

Language
en
Resource Type
Text
Document Type
Journal Issue/Article
Digital Object Identifier (DOI)
10.2307/4004034
Additional Information
Christensen, L., Coughenour, M. B., Ellis, J. E., & Chen, Z. (2003). Sustainability of Inner Mongolian grasslands: application of the Savanna model. Journal of Range Management, 56(4), 319-327.
IISN
0022-409X
OAI Identifier
oai:repository.arizona.edu:10150/643445
Journal Volume
56
Journal Number
4
Journal Pages
319-327
Journal Name
Journal of Range Management
Keywords
sustainable agriculture
grazing management
ecological resilience
permanent grasslands
primary productivity
simulation models
herbaceous plants
roots
arid lands
savannas
stocking rate
China
precipitation
grazing intensity
shrubs
biomass
grazing management
modeling
thresholds
sustainability and resilience
typical steppe
inner Mongolia