Rangeland Ecology & Management

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Estimation of grazing intensity along grazing gradients - the bias of nonlinearity
Author
Manthey, Michael
Peper, Jan
Publisher
Journal of Arid Environments
Publication Year
2010
Body

Distance to grazing hotspots like watering points or farms is regularly used as proxy for grazing intensity in extended rangelands. In many studies the resulting patterns between distance and grazing dependent variables are nonlinear with strong changes in the vicinity of the centre, a distinct transition zone, and hardly any changes on remote sites. Here we propose that this typical pattern just reflects the nonlinear relationship between grazing intensity and distance in circular grazing hotspots. Theoretical considerations as well as other proxies of grazing intensity like dung density or salinity suggest that reciprocal distance better represents grazing intensity. It is a more realistic description of the temporal distribution of livestock and often reveals linear relationships to grazing dependent variables preventing misinterpretations of thresholds that might be important for rangeland management.

Language
English
Resource Type
Text
Document Type
Journal Issue/Article
Journal Volume
74
Journal Number
10
Journal Pages
1351-1354
Journal Name
Journal of Arid Environments
Keywords
Ecological threshold
Grazing hotspot
piosphere
rangelands
state and transition model
trampling
grazing
livestock
management