盐碱水中较高的K+对Na+的相对浓度提高了土壤的水力导电性、盐浸效率和结构稳定性

4区农林科学 Q2 Agricultural and Biological Sciences

Soil Science Pub Date : 2023-06-23 DOI:10.5194/soil-9-339-2023

Sihui Yan, Tibin Zhang, Binbin Zhang, Tonggang Zhang, Y. Cheng, Chun Wang, Min Luo, Hao Feng, K. Siddique

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The\nresults indicated that at the constant EC of 4 dS m−1, the infiltration\nrate and water content were significantly (P<0.05) affected by\nK+ / Na+ values, and K0Na1, K1Na1 and K1Na0 significantly (P<0.05) reduced saturated hydraulic conductivity by 43.62 %, 29.04 % and\n18.06 %, respectively, compared with CK. The volumetric water content was\nsignificantly (P<0.05) higher in K0Na1 than CK at both 15 and 30 cm soil depths. K1Na1 and K1Na0 significantly (P<0.05) reduced the\ndesalination time and required leaching volume. K0Na1 and K1Na1 reached the\ndesalination standard after the fifth and second infiltration, respectively,\nas K1Na0 did not exceed the bulk electrical conductivity required for\nthe desalination prerequisite throughout the whole infiltration cycle at 15 cm\nsoil layer. 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引用次数: 0

摘要

摘要盐碱水灌溉引起的土壤盐碱化是全球范围内普遍存在的现象。土壤溶液的钠离子浓度和电导率对粘土的分散和膨胀有影响。具体而言，土壤钾(K+)也显著影响土壤结构稳定性，但在以往的研究或灌溉实践中很少关注这一问题。采用土壤柱试验研究了恒定EC (4 dS m−1)下K+ / Na+ (K+ / Na+)为0∶1(K0Na1)、1:1 (K1Na1)和1:0 (K1Na0)的不同K+ / Na+相对浓度的盐水和去离子水(CK)对土壤理化性质的影响。结果表明，在恒定EC为4 dS m−1时，k + / Na+值显著(P<0.05)影响入渗率和含水量，K0Na1、K1Na1和K1Na0较CK分别显著(P<0.05)降低了43.62%、29.04%和18.06%的饱和水导率。15 cm和30 cm土壤深度上，K0Na1处理的体积含水量显著高于对照(P<0.05)。K1Na1和K1Na0显著(P<0.05)降低了脱盐时间和所需的浸出量。K0Na1和K1Na1分别在第五次和第二次入渗后达到了脱盐标准，因为在整个入渗周期中，K1Na0没有超过脱盐前提条件所需的体积电导率。此外，由于粘土分散刺激大孔向微孔的转化，k0na1处理的土壤总孔隙度较CK显著降低，甚至增加了土壤大孔的比例。盐水中较高的K+与Na+的相对浓度更有利于土壤团聚体的稳定性，减轻了碱化导致大孔缩小的风险。

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The higher relative concentration of K+ to Na+ in saline water improves soil hydraulic conductivity, salt-leaching efficiency and structural stability

Abstract. Soil salinity and sodicity caused by saline water irrigation are widely observed globally. Clay dispersion and swelling are influenced by sodium (Na+) concentration and electrical conductivity (EC) of soil solution. Specifically, soil potassium (K+) also significantly affects soil structural stability, but for which concern was rarely addressed in previous studies or irrigation practices. A soil column experiment was carried out to examine the effects of saline water with different relative concentrations of K+ to Na+ (K+ / Na+), including K+ / Na+ of 0:1 (K0Na1), 1:1 (K1Na1) and 1:0 (K1Na0) at a constant EC (4 dS m−1), and deionized water as the control (CK), on soil physicochemical properties. The results indicated that at the constant EC of 4 dS m−1, the infiltration rate and water content were significantly (P<0.05) affected by K+ / Na+ values, and K0Na1, K1Na1 and K1Na0 significantly (P<0.05) reduced saturated hydraulic conductivity by 43.62 %, 29.04 % and 18.06 %, respectively, compared with CK. The volumetric water content was significantly (P<0.05) higher in K0Na1 than CK at both 15 and 30 cm soil depths. K1Na1 and K1Na0 significantly (P<0.05) reduced the desalination time and required leaching volume. K0Na1 and K1Na1 reached the desalination standard after the fifth and second infiltration, respectively, as K1Na0 did not exceed the bulk electrical conductivity required for the desalination prerequisite throughout the whole infiltration cycle at 15 cm soil layer. Furthermore, due to the transformation of macropores into micropores spurred by clay dispersion, soil total porosity in K0Na1 dramatically decreased compared with CK, and K1Na0 even increased the proportion of soil macropores. The higher relative concentration of K+ to Na+ in saline water was more conducive to soil aggregate stability, alleviating the risk of macropores reduction caused by sodicity.

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来源期刊

Soil Science 农林科学-土壤科学

CiteScore

2.70

自引率

0.00%

发文量

审稿时长

4.4 months

期刊介绍： Cessation.Soil Science satisfies the professional needs of all scientists and laboratory personnel involved in soil and plant research by publishing primary research reports and critical reviews of basic and applied soil science, especially as it relates to soil and plant studies and general environmental soil science. Each month, Soil Science presents authoritative research articles from an impressive array of discipline: soil chemistry and biochemistry, physics, fertility and nutrition, soil genesis and morphology, soil microbiology and mineralogy. Of immediate relevance to soil scientists-both industrial and academic-this unique publication also has long-range value for agronomists and environmental scientists.