Effect of groundwater depth on the distribution of water and salinity in the soil-<i>Tamarix chinensis</i> system under evaporation conditions

Ximei, 赵西梅 Zhao; Jiangbao, 夏江宝 Xia; Weifeng, 陈为峰 Chen; Yinping, 陈印平 Chen

doi:10.5846/stxb201606281276

Cited by 2 publications

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“…When the rising water enters the atmosphere through the diffusion of water vapour, the salts remain in the shallow soil layer. In the YRD, which has a large evaporation-precipitation ratio and shallow groundwater level, groundwater evaporation is the reason for secondary salinization [34]. During the processes of water evaporation and the upward movement of capillary water, water and salt are redistributed, and the soluble ions carried in the groundwater (or soil solution) gradually aggregate towards the surface soil layer [37].…”

Section: Discussionmentioning

confidence: 99%

“…Under the 0.3 m level, the contents of Na + and Cl - decreased with increasing soil depth; in contrast, they first decreased and then increased with an increasing soil depth under the other groundwater levels, exhibiting an obvious pattern of surface aggregation. The contents of both ions tended to mimic the distribution of soil salinity [34]. The above variations were mainly due to the influence of seawater intrusion.…”

Section: Discussionmentioning

confidence: 99%

“…In a study simulating the arid soil in Xinjiang, China [27] and water transport in soil columns planted with T . chinensis in the YRD [34], it was found that the water content in the soil profile increased with an increasing soil depth. The surface aggregation ability of Na + and Ca 2+ in the soil increased, and due to the hydrolysis of Na + , the amount of OH - increased.…”

Section: Discussionmentioning

confidence: 99%

“…When the groundwater level was shallow or the groundwater salinity was high, the salt contents in the soil profile were significantly affected by the groundwater level; a lower groundwater level resulted in a higher salt content in the soil profile [47]. Driven by evaporation, groundwater would move upward by capillary action to cause salt to accumulate in the surface soil layer [8,34,48], with Na + and Cl - accumulating most rapidly and exhibiting the highest concentration. Ye et al also found that the accumulation of SO 4 2- and Cl - mainly occurred in the shallow soil layer, and the variation in SO 4 2- in the deep soil layer was not obvious [20].…”

Section: Discussionmentioning

confidence: 99%

“…Hence, investigating the transport characteristics of soil salt ions can provide a theoretical basis and technical support for the prevention of soil secondary salinization. To date, the study of soil water and salt characteristics in the YRD has mainly focused on aspects including soil salinization types and factor analysis [18,21], remote-sensing image analysis of soil salinity under macroscopic conditions [23], groundwater characteristics and the variability in soil water and salt contents [31], the effects of groundwater on the distribution of vegetation [32], and the interaction effects of water and salt [33–34]. Xia et al [9] focused on the effects of soil water and salt contents on the variation in the Na + content of T .…”

Section: Introductionmentioning

confidence: 99%

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Transport characteristics of salt ions in soil columns planted with Tamarix chinensis under different groundwater levels

et al. 2019

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The groundwater level is the main factor affecting the distribution of soil salinity and vegetation in the Yellow River Delta (YRD), China, but the response relationship between the spatial distribution of soil salt ions and the groundwater level in the soil- Tamarix chinensis system remains unclear. In order to investigate the patterns of soil salt ions responding to groundwater levels, in the ‘groundwater-soil- T . chinensis ’ system. Soil columns planted with T . chinensis , a constructive species in the YRD, were taken as the study object, and six groundwater levels (0.3, 0.6, 0.9, 1.2, 1.5 and 1.8 m) were simulated under saline mineralization. The results demonstrated the following: As affected by groundwater, Na + and Cl - were the main ions in the T . chinensis -planted soil column, with a trend of decreasing first and then increasing by the increase of soil depth. However, the contents of K + and NO 3 - gradually decreased and CO 3 2- +HCO 3 - gradually increased. As affected by groundwater evaporation, all the salt ions except CO 3 2- +HCO 3 - exhibited different degrees of surface aggregation in the 0–20 cm layer. However, due to the impact of root uptake, the contents of the salt ions rapidly decreased in the root distribution layer (20–50 cm soil layer), which rendered a turning-point layer that was significantly lower than the surface soil layer; such decreases in ion contents showed a relatively large rate of variation. In the whole T . chinensis -planted soil column, with increasing groundwater level, the contents of Na + , Cl - , Ca 2+ , Mg 2+ , and NO 3 - all tended to first decrease, then increase and decrease again, but the content of CO 3 2- +HCO 3 - first decreased and then increased. Therefore, the 0.9 m groundwater level was the turning point at which the main salt ions underwent significant changes. The contents of Na + , Cl - , Ca 2+ and Mg 2+ in the T . chinensis planted soil column exhibited moderate variability (14.46%111.36%) at most groundwater level except less than 0.9 m. The...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Transport characteristics of salt ions in soil columns planted with Tamarix chinensis under different groundwater levels

et al. 2019

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The Influence of Shallow Groundwater on the Physicochemical Properties of Field Soil, Crop Yield, and Groundwater

Li,

et al. 2024

Agriculture

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The depth of shallow groundwater significantly influences crop growth and yield by altering the physicochemical properties of farmland soil profiles. Concurrently, shallow groundwater is subject to various changes, and it remains unclear how alterations in shallow groundwater depth within field soil impact soil physicochemical properties, crop yields, and the overall dynamics of groundwater transformations. To address these uncertainties, this study utilized a sample plot equipped with a volume lysimeter and implemented four distinct groundwater depths as treatment conditions: G0 (no groundwater depth), G1 (a groundwater depth of 40 cm), G2 (a groundwater depth of 70 cm), G3 (a groundwater depth of 110 cm), and G4 (a groundwater depth of 150 cm). This study was carried out on a weekly basis to monitor fluctuations in ion content in shallow groundwater and soil moisture after the summer maize harvest, and special attention was afforded to non-irrigation conditions. This study also scrutinized the distribution of salt and nutrients in soil profiles and assessed changes in summer maize yield. Very interesting findings were obtained by conducting the study. Firstly, the shallower the groundwater depth, the higher the water and salt content of the soil surface. Small, frequent rainfall events (precipitation ≤ 25 mm) facilitated the effective removal of salt from the soil surface. Despite increased rainfall contributing to salt ion dilution in groundwater, the risk of soil surface salinization increased at the surface level. Secondly, a linear relationship existed between groundwater depth and surface soil moisture and salt content. With every 10 cm increase in groundwater depth, the surface soil moisture and salt content decreased by 0.56% and 0.06 g/kg, respectively. Soil nutrients tended to accumulate in the surface layer, with nutrient content increasing with depth. However, C/N was not notably affected by groundwater depth. Thirdly, Na+ and K+ consistently dominated the soil surface. As soil salinity increased, the prevalence of Cl− and SO42− increased, with the rate of SO42− increase surpassing that of chlorine. HCO3− altered by rainfall served as an indicator of soil alkalization characteristics, while Na+ and K+ in soil, along with Cl− and SO42− derived from groundwater, represented soil salt composition and salinization trends. Ultimately, under the conditions of this study, the most favorable groundwater depth for the growth of summer maize was determined to be 1.1 m. Analyzing the impact of different shallow groundwater depths on the physicochemical properties of farmland soil enhances our understanding of the mechanisms of interaction between groundwater and soil in agricultural ecosystems. This knowledge is instrumental in significantly improving the soil environment, thereby ensuring optimal crop yields.

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Effect of groundwater depth on the distribution of water and salinity in the soil-Tamarix chinensis system under evaporation conditions

Cited by 2 publications

References 0 publications

Transport characteristics of salt ions in soil columns planted with Tamarix chinensis under different groundwater levels

Transport characteristics of salt ions in soil columns planted with Tamarix chinensis under different groundwater levels

The Influence of Shallow Groundwater on the Physicochemical Properties of Field Soil, Crop Yield, and Groundwater

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