Volume 7, Issue 4 (winter 2004)                   JWSS 2004, 7(4): 25-37 | Back to browse issues page

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J. Mohammadi, F. Raeisi Gahrooee. Fractal Description of the Impact of Long-term Grazing Exclusion on Spatial Variability of Some Soil Chemical Properties. JWSS. 2004; 7 (4) :25-37
URL: http://jstnar.iut.ac.ir/article-1-482-en.html
Abstract:   (21288 Views)
Knowledge of the spatial dependency of soil properties, sensitive to grazing systems, is important from an ecosystem protection point of view. In the current study, geostatistical methods and fractal concepts have been used in order to characterize the impact of long-term grazing exclusion on the spatial variability of some soil chemical parameters including organic matter, total nitrogen, available phosphorous, and available potassium in both ungrazed and grazed sites located in Sabzkuh region, Chaharmahal Bakhtiari Province. The spatial pattern of different variables was studied using variogram. The results indicate that spatial variability of soil parameters depends upon grazing history. The variogram of organic matter in grazed areas shows a linear behavior without reaching the sill variance while organic matter in the ungrazed area established a strong spatial structure. Moreover, available phosphorous in the grazed area had pure nugget variation. Variograms of total nitrogen and available potassium in both grazed and ungrazed areas showed spatial structure approximated by spherical model. However, the range of variograms in exclusion sites was twice that of the grazed area. The results of applying the fractal theory show that soil properties have fractional behavior since increasing the scale of study reveals more details. Moreover, calculated fractal dimension values from variograms of different variables were close to 2.0 although this index was usually greater in the grazed area than in the exclusion sites. The calculated fractal dimensions can be used as a proper indicator of describing the pattern of spatial variability and its complexity.
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Type of Study: Research | Subject: Ggeneral
Received: 2008/01/9

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