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Spatial Analysis of Phosphorus Sorption Capacity in a Semiarid Altered Wetland

M. I. Litaor*,a, O. Reichmannb, M. Belzera, K. Auerswaldc, A. Nishrid and M. Shenkerb

a Dep. of Biotechnology and Environmental Sciences, Tel-Hai Academic College, Upper Galilee 12210, Israel
b Dep. of Soil and Water Sciences, Faculty of Agricultural, Food and Environmental Quality Sciences, The Hebrew University of Jerusalem, Rehovot 76100, Israel
c Dep. of Grassland Science, Technical Univ. Muenchen, Am Hochanger 1, D-85350 Freising-Weihenstephan, Germany
d Kinneret Limnological Laboratory, POB 345 Tiberias, Israel



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  		Fig. 1. Sampling locations in the Hula Valley, Israel.

 


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  		Fig. 2. General relative omnidirectional variograms of oxalate-extractable Fe (a) and Al (b) and a traditional variogram of the normal score values of the degree of phosphorus saturation (DPS) (c). In the construction of these variograms, we used 70 georeferenced locations across the study area with a unit separation that varied between 1200 and 800 m, with a lag tolerance of 600 to 400 m, and a bandwidth of 500 m.

 


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  		Fig. 3. E-type estimates of the degree of phosphorus saturation (DPS) averaged from 100 realizations derived from the DPS data.

 


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  		Fig. 4. A contour map of the probability that a given degree of phosphorus saturation (DPS) value exceeds the widely used threshold of 25%.

 


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  		Fig. 5. Summary statistics of dissolved phosphorus (DP) concentrations in ground water.

 




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