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Harmonization of the Results of Soil Salinity Chemical Study
Arid Ecosystems Pub Date : 2023-08-12 , DOI: 10.1134/s2079096123030095
K. O. Prokopyeva , M. V. Konyushkova

Abstract

Soil salinization is one of the main environmental factors that limits the growth and productivity of many plants. Soil salinity is assessed by different methods in various countries of the world: by the method of water extracts in Russia and a number of other countries and by electrical conductivity of extracts from soil pastes all over the world. These methods are time consuming, thus short-cut methods are used for mass analysis. For example, the salt status of soils is often assessed by the leading toxic ion (chlorine or sodium) in Russia or by electrical conductivity for different soil to water ratios (1 : 1, 1 : 2.5, 1 : 5, and 1 : 10) in a number of other countries. In this work, we compare different methods to substantiate the use of electrical conductivity measured in a suspension 1 : 5. The following approaches are analyzed: 1—determination of the specific electrical conductivity in water suspension (1 : 5); 2—measurement of pNa and pCl in water suspension (1 : 5) by ion-selective electrodes; and 3—determination of sodium in water extract (1 : 5) by atomic absorption spectrometry. Salinization is evaluated in samples of light clay soils of the dry steppe zone mainly of chloride-sodium salinity. The results show the strongest correlation between measurements of the specific electrical conductivity (by conductometer) and sodium activity (by ion-selective electrodes). A rather close relationship between the specific electrical conductivity and the content of sodium ions in water extract has been revealed, and a conversion function of these parameters has been obtained: ЕС1 : 5 = 0.213Na1 : 5 + 0.17 (with a free term) and ЕС1 : 5 = 0.23Na1 : 5 (without a free term). It is proposed to use the following criteria to assess the salinity by electrical conductivity (dS/m) in water suspension (1 : 5): 0–0.4, nonsaline; 0.4–0.6, slightly saline; 0.6–1, medium saline; 1–1.9, strongly saline; and >1.9, very strongly saline. The comparison of different gradations of soil salinity by cross tables, using the chi-square test and the Kappa index, shows statistically significant correlation, which enables the use of various analytical methods to assess soil salinity.



中文翻译:

土壤盐分化学研究结果的协调

摘要

土壤盐碱化是限制许多植物生长和生产力的主要环境因素之一。世界各国采用不同的方法评估土壤盐分:俄罗斯和其他一些国家采用水提取物法,而世界各地则采用土壤浆体提取物的电导率法。这些方法非常耗时,因此采用快捷方法进行质量分析。例如,在俄罗斯,土壤的盐分状况通常通过主要有毒离子(氯或钠)或不同土水比(1:1、1:2.5、1:5 和 1:10)的电导率来评估。 )在其他一些国家。在这项工作中,我们比较了不同的方法来证实使用在悬浮液中测量的电导率 1:5。分析了以下方法:1—水悬浮液中比电导率的测定(1:5);2-通过离子选择电极测量水悬浮液(1:5)中的pNa和pCl;3-通过原子吸收光谱法测定水提取物(1:5)中的钠。盐渍化是在干燥草原地区的轻质粘土样品中进行的,主要是氯化钠盐度。结果显示,比电导率(通过电导计)和钠活度(通过离子选择性电极)测量之间的相关性最强。揭示了比电导率与水提取物中钠离子含量之间相当密切的关系,并获得了这些参数的转换函数:ЕС 5); 2-通过离子选择电极测量水悬浮液(1:5)中的pNa和pCl;3-通过原子吸收光谱法测定水提取物(1:5)中的钠。盐渍化是在干燥草原地区的轻质粘土样品中进行的,主要是氯化钠盐度。结果显示,比电导率(通过电导计)和钠活度(通过离子选择性电极)测量之间的相关性最强。揭示了比电导率与水提取物中钠离子含量之间相当密切的关系,并获得了这些参数的转换函数:ЕС 5); 2-通过离子选择电极测量水悬浮液(1:5)中的pNa和pCl;3-通过原子吸收光谱法测定水提取物(1:5)中的钠。盐渍化是在干燥草原地区的轻质粘土样品中进行的,主要是氯化钠盐度。结果显示,比电导率(通过电导计)和钠活度(通过离子选择性电极)测量之间的相关性最强。揭示了比电导率与水提取物中钠离子含量之间相当密切的关系,并获得了这些参数的转换函数:ЕС 盐渍化是在干燥草原地区的轻质粘土样品中进行的,主要是氯化钠盐度。结果显示,比电导率(通过电导计)和钠活度(通过离子选择性电极)测量之间的相关性最强。揭示了比电导率与水提取物中钠离子含量之间相当密切的关系,并获得了这些参数的转换函数:ЕС 盐渍化是在干燥草原地区的轻质粘土样品中进行的,主要是氯化钠盐度。结果显示,比电导率(通过电导计)和钠活度(通过离子选择性电极)测量之间的相关性最强。揭示了比电导率与水提取物中钠离子含量之间相当密切的关系,并获得了这些参数的转换函数:ЕС1 : 5 = 0.213Na 1 : 5 + 0.17(有自由项)和 ЕС 1 : 5 = 0.23Na 1 : 5(无自由项)。建议使用以下标准通过水悬浮液(1:5)中的电导率(dS/m)评估盐度:0-0.4,非盐;0.4-0.6,微盐水;0.6–1,中等生理盐水;1–1.9,强盐水;>1.9,非常强的盐水。使用卡方检验和卡帕指数通过交叉表比较不同等级的土壤盐分,显示出统计上显着的相关性,这使得可以使用各种分析方法来评估土壤盐分。

更新日期:2023-08-14
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