Afshar H, Salehi MH, Mohammadi J, and Mehnatkesh A. 2009. Spatial Variability of Soil Properties and Irrigated Wheat Yield in a Quantitative Suitability Map, A Case Study: Shahr-e-Kian Area, Chaharmahalva-Bakhtiari Province. Journal of Water and Soil 23(1): .161-172.
Birkeland PW, 1984. Soils and Geomorphology. Oxford University Press, NY.
Cambardella CA, Moorman TB, Parkin TB, Karlen DL, Turco RF and Konopka AE, 1994. Field scale variability of soil properties in Central Iowa soils. Soil Science Society of America Journal 58: 1501-1511.
Chaneton EJ and Avado RSL, 1996. Soil nutrients and salinity after long-term grazing exclusion in flooding Pama grassland. Journal of Range management 49: 182-187.
Covelo F, Rodríguez A And Gallardo A, 2008. Spatial pattern and scale of leaf N and P resumption efficiency and proficiency in a Quercusrobur population. Plant and Soil 311:109–119.
Dalsgard K, Bassrup E and Bunting BT, 1981. The influence of topography on the development of Alfisols on calcareous clay till in Denmark. Catena 8: 111-136.
Daniels WL, Everett CJ and Zelazny LW, 1987. Virgin hardwood forest soils of the southern Appalachian Mountains. I. soil morphology and geomorphology. Soil Science Society of America Journal. 51: 722-729.
Davatgar N, Neyshaboori M, and Moghaddam M. 2001. The analysis of information obtained from soil variables may by use of semivariogram models. Iranian J. Agric. Sci. 31(1): 724-735.
Desta F, Colbert JJ, Rentch JS and Gottschalk KW, 2004. Aspect induced differences in vegetation, soil and microclimatic characteristics of an Appalachian watershed. Journal Costanea 69: 92-108.
Goovaerts P, 1997. Geostatistics for natural resources evaluation. Oxford University Press, New York.
Hasani pak AA. 2007. Geostatistics. Tehran University Press 314p.
Hangsheng L, Wheeler D, Bell J, Wilding L, 2005. Assessment of soil spatial variability at multiple scales. Ecological Modeling 182: 271–290.
Jafari GhH. 2010. The Impact of Slope Direction of Land Surfaces On Dryness in (case study: Oghlid). 4th International Congress of the Islamic World Geographers, Zahedan, 1-8.
Jafari Haghighi M. 2003. Sampling methods and important physical and chemical analysis methods. Nedayezoha Press, 187p.
Kamaree R. 2002. Spatial changes of production, density and plant cover percent of Nitraria schoberi L. Ms.c Thesis of Tarbiate modares University.
Kooch Y, Hosseini SM, Mohammadi J, and Hojjati SM. 2012. An Investigation in to Spatial Structure of Soil Characteristics in a Beech Forest Stand Using Geostatistical Approach. J. Sci. & Technol. Agric. & Natur. Resour., Water and Soil Sci 16, 60: 239-250.
Li HB and Reynolds JF, 1995. On definition and quantification of heterogeneity. Oikos 73: 280–284.
McGill WB, Figueiredo CT. 1993.Total nitrogen pp 201-211. In: Carter MR (Ed.), Soil Sampling and Methods of Analysis. Lewis Publishers, Boca Rton, FL.
Mohammadi J. 2001.An overview of the geostatystic principles and its application in soil science. Soil and water journal 15: 99-121.
Nelson DW and Sommers LE, 1982. Total carbon, organic carbon, and organic matter pp 539-579. In: Page AL (Ed), Methods of Soil Analysis.Part 2.Chemical and Microbiological Properties, seconded. Agronomy Monographs. ASASSA, Madison,WI.
PazGonzales A, Vieira SR and Castro T, 2000. The effect of cultivation on the spatial variability of selected properties of an umbric horizon. Geoderma 97: 273-292.
Rogerio C, Ana LBH and Quirijn de JL, 2006. Spatio- temporal variability of soil water tension in a tropical soil in Brazil. Geoderma 133: 231-243.
Sauer TJ, Cambardella CA and Meek DW, 2006. Spatial variation of soil properties relating to vegetation changes. Plant and Soil 280:1–5.
Tavakoli M, Raiesi F, and Salehi M.H. 2008. Evaluation of selected soil quality indicators in almond orchard located on north and south-facing slopes in Saman region, Shahrekord. J. Agric. Sci. Natur. Resour 15(1): 79-93.
Tsui CC, Chen ZS and Hsieh CF, 2004. Relationships between soil properties and slope position in a lowland rain forest of southern Taiwan. Geoderma 123: 131-142.
Vieira SR and Paz Gonzalez A, 2003. Analysis of the spatial variability of crop yield and soil properties in small agricultural plots. Bragantia, Campinas 62: 127-138.
Virgilio ND, Monti A and Venturi G, 2007. Spatial variability of switchgrass (Panicum virgatum L.) yield as related to soil parameters in a small field. Field Crops Research 101: 232-239.
Wang Y, Zhang X and Huang C, 2009. Spatial variability of soil total nitrogen and soil total phosphorus under different land uses in a small watershed on the Loess Plateau, China. Geoderma 150: 141–149.
Webster R and Oliver MA, 2001. Geostatistics for Environmental Scientists. John Wiley and sons, Brisbane, Australia.
Weindorf DC and Zhu Y, 2010. Spatial variability of soil properties at Capulin volcano, New Mexico, USA: Implications for sampling strategy. Pedosphere 20(2):185-197.
Yi-chang W You-lu B Ji-yun J Fang Z Li-ping Z and Xiao-qiang L, 2009. Spatial variability of soil chemical properties in the reclaiming marine Foreland to Yellow Sea of China. Agricultural Sciences in China 8(9): 1103-1111.
Zaiden R, Dan J and Koyumdjisky H, 1982. The influence of parent material and relief on soil formation in the arid regions of eastern Samaria. In: D. H. Yalon (Editor), arid soils and geomorphic processes. Catena suppl. Cremlingen 1: 117-139.
Zhang C, Xue S, Liu G and Zhang C, 2012. Effects of slope aspect on soil chemical and microbial properties during natural recovery on abandoned cropland in the Loess Plateau, China. Advanced Materials Research 3: 56-360.