Study on spatial variability and pattern of soil salinity of the oasis in the headstreams of the Tarim River Basin:A case study on Yuepuhu oasis
Received date: 2007-01-23
Revised date: 2007-07-10
Online published: 2008-01-25
Supported by
中国科学院西部行动计划项目 (KZCX2-XB2-03 )和国家自然科学基金 (90502004,30500081 )共同资助
Soil properties are one of the regional variables with the properties of geological structure and the stochastics of statistics. Geostatistics, based on the regional variable theory, has been proved to be one of the most effective methods to analyze the spatial distribution and its variation law of soil properties. It is the foundation to well manage the soil and prevent the soil salinization for fully understanding the spatial distribution of soil salinity. In the present study, based on regionalized variable theory, the spatial variability of soil salinity in different soil layers were studied by means of GPS, GIS, semivariograms of geostatistics and Kriging method in Yuepuhu oasis to quantificationally analyze the spatial variation and patterns of soil salinity in the headstream area of the Tarim River, with the purpose of provideing the academic basis for the area partitioning, meliorating and utilizing salinized soil in arid oasis. In the study, 118 samples were chosen from four soil layers at depths of 0-30cm,30-60cm,60-100cm and 100-200cm.The results indicated that the salt contents in different soil layers were high with 17.44g/kg, 11.67g/kg, 9.10g/kg and 8.14g/kg in 0-30cm, 30-60cm, 60-100cm and 100-200cm, respectively. The semivariogram of soil salinity of the four depths was best described by the Exponential model, of which the 100-200cm layer was best fitted by the Spherical model. The ranges of spatial autocorrelation differ from each other among the different soil layers. From the surface to the deeper layer, the autocorrelation ranges of the soil salinity increased gradually with 56.40 km, 91.10 km, 114.10 km and 160.00 km, respectively. The analysis of spatial pattern of soil salinity indicated that high values of soil salinity were mainly distributed at the places that were under the intensive anthropogenic activities, near to the watershed or located at low-lying areas. In vertical direction, the salinity of surface soil was the highest and it decreased gradually with the increase of soil depth. In the study area, the spatial variations and patterns of soil salinity in oasis were restricted to both the structural factors and the non-structural factors. For the impact of structural factors on surface soil was relatively less, and that of non-structural factors, i.e. anthropogenic activities, was greater. Some structural factors, such as topography, soil matrix, superficial groundwater table and soil water content from headstreams, strengthened with the increase of soil depths, and the spatial variations of soil salinity increased.
Key words： geostatistics; GIS; soil salinity; spatial variability; kriging method; the Tarim River
ZHAO Rui-feng, CHEN Ya-ning, HONG Chuan-xun, LI Wei-hong, BAI Yun-gang . Study on spatial variability and pattern of soil salinity of the oasis in the headstreams of the Tarim River Basin:A case study on Yuepuhu oasis[J]. GEOGRAPHICAL RESEARCH, 2008 , 27(1) : 135 -144 . DOI: 10.11821/yj2008010015
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