Abstract

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Title:: Spatial Variability Analysis on Total Salt Content and pH Value of Soil on Gravel-mulched Land in Ningxia

Author(s):: PAN Jiaying; WANG Jianyu; WANG Chao; (College of Ｒesources and Environment，Ningxia University，Yinchuan，Ningxia 750021)

Keywords:: spatial variability analysis; total salt content of soil; geostatistics; gravel-mulched land

Abstract:: The total salt content and pH value of gravel-mulched land in different depths on the spatial variability was studied in this paper.The descriptive statistics showed that：the pH value was decreased and the coefficient of variation of pH value in different lays was <10% and in a slight spatial variability with the soil depth increased；the total salt content increased and the coefficient of variation was >100% and in a high spatial variability with soil depth increased.The results showed that the theoretical distribution models of pH value in different layers were Gaussian model with a moderate correlation and it reflected that the spatial variability of pH value on gravel-mulched land soil was jointly affected by random factors and the role of structural factors；the total salt theoretical distribution model was the Gaussian model in 0-20 cm and 20-40 cm，but it was spherical model in 40-60 cm of soil depths and it showed that there were a high spatial correlation and their spatial variability was jointly affected by structural factors.Kriging analyses showed that the total salt content and pH value distribute in annular on the horizontal direction.The soil pH value was decreased gradually from northwest to southeast，but the total salt content increased from northwest to southeast.