| Cite this article: | 刘燕楠,孙贯芳,毛威,等.基于地统计分析的河套灌区土壤水盐空间变异规律分析[J].灌溉排水学报,0,():-. |
| LIU Yan-nan,SUN Guan-fang,Mao Wei,et al.基于地统计分析的河套灌区土壤水盐空间变异规律分析[J].灌溉排水学报,0,():-. |
|
| |
|
|
| This article has been：Browse 516Times Download 0Times |
|
|
|
| DOI：10.13522/j.cnki.ggps.2021621 |
|
| Spatial Variability of Soil Water and Salt in Hetao Irrigation District Based on Geostatistical Analysis |
|
LIU Yan-nan1, SUN Guan-fang2, Mao Wei1, CHENG Xiao-yao3, ZHU Yan1, YANG Jin-zhong1
|
|
1.The State Key Laboratory of Water Resource and Hydropower Engineering Science, Wuhan University;2.Institute of Soil and Water Conservation, Northwest Agriculture and Forestry University;3.Zhongnan Municipal Administration General Design Institute Co. Ltd., China Municipal Engineering
|
| Abstract: |
| 【Background】The decline of agricultural production caused by soil salinization is one of the major threats worldwide, especially in arid and semi-arid regions. Soil water and salt has significant spatial variability, which increases the difficulty in soil salinity prediction and control. Therefore, understanding spatial variability in soil water and salt is essential to improve water use efficiency and prevent soil salinization.【Objective】This paper aims to analyze the spatial characteristics and variability of soil water and salt at different depths and their relationship in the Hetao Irrigation District. Besides, the influence of groundwater depth and salinity on soil salinity has also been presented.【Method】The Longsheng irrigation area, which is a typical well-canal conjunctive irrigation area, was chosen as the study site. An analysis of soil water content and soil salt content was performed using field sampling combined with laboratory testing.. Then the spatial variability of soil water and salt in root layer (0-60 cm) and deep soil (60-120 cm, 120-180 cm) was analyzed by classical statistical and geostatistical methods. In addition, the relationship between groundwater environment and soil salinity was also analyzed by Pearson correlation analysis. 【Result】① Averaged soil water content at different depths were ranked in the order of 0-60 cm<60-120 cm<120-180 cm, while the averaged soil salt content were ranked in the order of 0-60 cm>60-120 cm>120-180 cm. The variation coefficient and nugget coefficient of soil water and salt decreased monotonically with increasing depth, while the spatial autocorrelation distance increase monotonically layers by layer with increasing depth. Soil water and salt in the root layer both exhibited moderate spatial autocorrelation. In contrast, soil water and salt in deeper soils showed strong spatial autocorrelation. ② On the one hand, the variation coefficient and nugget coefficient of soil water in each layer are smaller than soil salt, while the variation range is larger than soil salt. On the other hand, there was a strong correlation of negative correlation between them. ③ The soil salt in each layer is exponentially related to groundwater depth and is power function of groundwater salinity. When the groundwater depth is greater than 2.5m, the soil salt content is low and the change trend of soil salinity with the groundwater depth is smaller in each layer. 【Conclusion】Salt accumulated in the root zone, and its spatial characteristics and distribution pattern are closely related to soil water. Groundwater depth is the major controlling factor for soil salinity control, and it is recommended that the groundwater depth should be controlled below 2.5m. |
| Key words: Hetao Irrigation District; soil water and salt; geostatistics; spatial variation; groundwater environment |
|
|
|
|
|
|
