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Spatial Variability of Selected Soil Attributes under Agricultural Land Use System in a Mountainous Watershed, Ethiopia

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Title Spatial Variability of Selected Soil Attributes under Agricultural Land Use System in a Mountainous Watershed, Ethiopia
 
Creator Addis, Hailu Kendie
 
Contributor Klik, Andreas
Strohmeier, Stefan
 
Subject soil landscape
soil attribute
spatial variability
semivariogram
watershed
 
Description In the Ethiopian Highlands, research projects were often measuring soil attributes of spatially
structured point data but soil variability at a watershed scale is not clearly defined. This study was
conducted to assess the correlation among selected soil attributes and to illustrate the spatial
pattern and dependence of neighboring observations. The 53.7 km2 study watershed was divided
into a 500 m by 500 m square grid using arcgis and at the center of each grid soil samples from 0
to 25 cm depth were collected within 184 locations. The descriptive statistics revealed available
phosphorous (AP) had the largest coefficient of variation (CV = 104) while pH was the least varia-
ble. There was a positive link between elevation and SOC whereas bulk density (ρd) and pH indi-
cated an inverse relationship with elevation and SOC. The value for nugget/sill of ρd, pH and ele-
vation are less than 0.25, and depicts that it has strong spatial autocorrelation. The value for nugget/
sill of SOC, and TN found between 0.25 and 0.75, and indicate that they have moderate spatial au-
tocorrelation. With regard to AP, the value for nugget/sill is more than 0.75, which displays a weak
spatial autocorrelation. Semivariograms of ρd, pH and elevation were best fitted to Gaussian mod-
el whereas SOC, TN and AP were best fitted to exponential function. Generally, the study verified
that soil measurements taken at the given scale through regular sampling interval were adequate
to capture the spatial dependence of numerous initial soil assessments in the study watershed.
 
Date 2015-06-19
2016-11-24T09:58:29Z
2016-11-24T09:58:29Z
 
Type Journal Article
 
Identifier http://www.scirp.org/journal/PaperInformation.aspx?PaperID=57289
https://mel.cgiar.org/reporting/download/hash/CALCpDBu
Hailu Kendie Addis, Andreas Klik, Stefan Strohmeier. (19/6/2015). Spatial Variability of Selected Soil Attributes under Agricultural Land Use System in a Mountainous Watershed, Ethiopia. International Journal of Geosciences, 6 (6), pp. 605-613.
https://hdl.handle.net/20.500.11766/5076
Open access
 
Language en
 
Rights CC-BY-4.0
 
Format PDF
 
Publisher Scientific Research Publishing
 
Source International Journal of Geosciences;6,(2015) Pagination 605,613