Spatial variability and distribution pattern of soil salinity factors in topsoil of farmland in Yanqi Basin,Xinjiang
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DOI:10.7606/j.issn.1000-7601.2019.02.28
Key Words: topsoil of farmland  soil salinity factors  spatial variability  distribution pattern  Yanqi Basin
Author NameAffiliation
WANG Wei-wei College of Geographical Science and Tourism, Xinjiang Normal University, Urumqi, Xinjiang 830054, China 
Mamattursun·EZIZ College of Geographical Science and Tourism, Xinjiang Normal University, Urumqi, Xinjiang 830054, China
Xinjiang Laboratory of Lake Environment and Resources in Arid Zone, Xinjiang Normal University, Urumqi, Xinjiang 830054, China 
Atiyagul·RIXIT College of Geographical Science and Tourism, Xinjiang Normal University, Urumqi, Xinjiang 830054, China 
Anwar·MOHAMMAD College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi, Xinjiang 830046, China 
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Abstract:
      A total of 195 soil samples from farmlands were collected from Yanqi Basin, Xinjiang and soil pH value, salt content and electrical conductivity(EC)were measured. Geostatistics and spatial autocorrelation method were used to quantitatively analyze the spatial heterogeneity and distribution pattern of soil salinity, and the risk assessment was conducted based on salinity. The results indicated that: (1) pH of farmland soil varied less than 10% in Yanqi Basin, indicating mild spatial variability; electrical conductivity varied vigorously with a variation coefficient of 1.102; the variation in salinity was moderate. (2) Through Kriging spatial interpolation, the soils with high salinity and conductivity values were distributed in the low-lying areas on the lakeshore of Bosten Lake and in the farmland soils in the south of Hejing County, mainly along the river. The high pH value areas were mainly distributed in the farmland in the northern part of the lakeshore wetland southwest of Bosten Lake, and were distributed stepwise from south to north. (3) Moran’s I of soil pH, conductivity, and salinity ranged from -0.0494 to 0.2585, -0.0627 to 0.1406, and -0.0624 to 0.0702, respectively and the variation range of conductivity and salinity was narrow. Soil pH and electrical conductivity showed similar Moran’s I with increasing spatial distance. (4) The farmland soil in the study area was dominated by non-salinized soil and mild salinized soil. It is found that the probability distribution of soil salinity at different levels of salt content is very useful for risk analysis and evaluation of soil salinization of farmland.