| Spatial variation characteristics of soil salinity in the lower reaches of the Tarim River in spring — A Case study on 31th regiment of Xinjiang Second Division |
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| DOI：10.7606/j.issn.1000-7601.2020.01.27 |
| Key Words: soil salinity base ion spatial variation GIS Tarim River |
| Author Name | Affiliation | | DING Bangxin | College of Pratacultural and Environmental Science, Xinjiang Agriculture University, Urumqi, Xinjiang 830052, China | | BAI Yungang | Xinjian Research Institute of Water Resources and Hydropower, Urumqi, Xinjiang 830049, China | | LIU Xueyan | College of Pratacultural and Environmental Science, Xinjiang Agriculture University, Urumqi, Xinjiang 830052, China | | CHEN Xingxing | College of Pratacultural and Environmental Science, Xinjiang Agriculture University, Urumqi, Xinjiang 830052, China | | LIU Hongbo | Xinjian Research Institute of Water Resources and Hydropower, Urumqi, Xinjiang 830049, China | | XIAO Jun | Xinjian Research Institute of Water Resources and Hydropower, Urumqi, Xinjiang 830049, China |
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| Abstract: |
| Soil salinization is one of the main factors restricting the development of agriculture in the lower reaches of the Tarim River. The spatial variability and distribution of total salt and base ions in different depths of the oasis irrigation area in the lower reaches of the Tarim River (31th regiment of Xinjiang Second Division) were analyzed by using Semi\|Variogram and Kriging spatial interpolation of geostatistics. The results showed that the soil in the study area was alkaline in spring, and the anions in all soil layer were mainly SO2-4, and the cations were mainly K+ and Na+. The semi\|variance function model of soil salinity, Ca2+ and Cl-, in the root zone (0~60 cm) of the soil profile in the region accords with the Gaussian model, The soil salinity in deep layer (60~100 cm), HCO-3, SO2-4 conformed to the exponential model. Mg2+ and K++Na+ conformed to the spherical model. The spatial autocorrelation range of each variable was quite different. Salt distribution characteristics are greatly affected by human activities and topography and water sources. The soil salinity content in the root zoon layer soil gradually increased from northwest to southeast, and the range of variation was 2.28~3.27 g·kg-1. The salinity of deep soil gradually decreased from northwest to southeast, and the range of variation was 2.31 and 4.63 g·kg-1. The HCO-3 had the same characteristics as that in the root zone layer, no obvious change in the content of other ions. The general trend of vertical distribution of soil salinity was approximately the same. There was no significant difference in soil salinity between root layer and deep layer. Mastering the degree of soil salinization is of great significance for the improvement and utilization of saline soil. |
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