冻融作用下地下水浅埋区土壤盐分及离子变化特征

doi:10.13866/j.azr.2022.02.12

Abstract

Abstract:

In shallow groundwater areas, freeze-thaw is one of the most important factors affecting the soil salinization process. Determining the variation in soil salinity and different soil salinity ions during the freeze-thaw process is of great significance for the prevention and control of soil salinization in seasonal freeze-thaw areas. A ground lysimeter system located on Taigu Water Balance Experimental Field was used to examine soil salinity and soil salinity ions. The ground lysimeter system had six different groundwater depths (0.5, 1.0, 1.5, 2.0, 2.5 m, and 3.0 m) and the soil water content, soluble soil salinity content, and content of soluble soil salinity irons were analyzed during the freeze-thaw period from 2020 to 2021. Correlations between the soil salt content and five salinity ions were analyzed using the Gray correlation method. The results showed that the soluble salinity ions in the soil mainly consisted of Na⁺, Ca²⁺, HCO₃^-, SO₄^2-, and Cl^-. The correlation analysis revealed that the soil salt content of soil was highly significantly correlated with Na⁺ and HCO₃^-, and significantly correlated with Ca²⁺ and SO₄^2-. The position of the frozen layer had a strong influence on changes in Na⁺, HCO₃^-, SO₄^2-, and soil salt content throughout the freeze-thaw process; however, Ca²⁺ and Cl^- were less affected by the frozen layer. When the entire frozen layer was within the maximum capillary water rise height, salt accumulation in the frozen layer was obvious. However, the frozen layer acted as an obstruction when it was not within the maximum capillary water rise height. There was an inverse relationship between the groundwater depth and soil salt content. When the depth of groundwater was 3.0 m, the change in soil salt content was much lower than that at groundwater depths of 0.5-2.5 m. These results provide a theoretical basis for the prevention and control of soil salinization in shallow groundwater areas.

Key words: freeze-thaw action, groundwater depth, soil salinity, ion content

LIU Lei,CHEN Junfeng,LYU Pengpeng,ZHAO Dexing,DU Qi. Variation in soil salinity and ions in a shallow groundwater area under freeze-thaw[J].Arid Zone Research, 2022, 39(2): 448-455.

Figures/Tables 6

Fig. 1

Tab. 1

Tab. 2

Correlation between salt ions in soil profile"

离子种类	含盐量	Na⁺	Ca²⁺	Cl^-	$S O 4 2 -$	$HC O 3 -$
含盐量	1
Na⁺	0.900	1
Ca²⁺	0.817	0.694	1
Cl^-	0.730	0.749	0.749	1
$S O 4 2 -$	0.806	0.798	0.833	0.847	1
$HC O 3 -$	0.909	0.699	0.820	0.442	0.516	1

Tab. 2

Fig. 2

Fig. 3

Fig. 4

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土壤质地	不同粒径质量百分数/%			最大毛细水上升高度/cm	给水度	干容重/（g·cm^-3）
土壤质地	黏粒 <0.002 mm	粉粒 0.002~0.02 mm	砂粒 >0.02 mm	最大毛细水上升高度/cm	给水度	干容重/（g·cm^-3）
砂壤土	16.4	27.5	56.1	185	0.08	1.45

Variation in soil salinity and ions in a shallow groundwater area under freeze-thaw

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