天山北麓苏打盐碱化土壤pH值测定中的影响因素分析

发布时间：2017-12-26 20:41

本文关键词：天山北麓苏打盐碱化土壤pH值测定中的影响因素分析　出处：《新疆农业科学》2016年12期 　论文类型：期刊论文

【摘要】：【目的】pH值是碱土诊断及分类的重要依据。测定天山北麓苏打盐碱化土壤pH值,并分析其影响因素,为盐碱化土壤pH值测定的适应方法提供依据。【方法】采用电位法,对新疆天山北麓典型的碳酸盐含量高、碱性强、盐分类型复杂的苏打盐碱化土壤样本,分别设置不同水土比(1∶1、2.5∶1、5∶1)和不同静置时间(1、5、10、30和60min)进行pH值测定。【结果】1水土比对pH值测定影响较大,但碱性强弱并不是稀释效应的决定性因素,含有较多CaCO_3的氯化物盐样本稀释效应最强,最大pH值增加量达0.57个单位,这种稀释效应主要来自CaCO_3与中性钠盐反应生成的苏打水解。2水土比2.5∶1时,难溶盐类的溶解基本达到稳定;而1∶1水土比不适用于研究区盐碱化土壤的pH值测定。3静置时间对奇台碱土pH值测定的影响小于艾比湖盐土,静置过程中大气CO_2溶解不影响pH值测定结果。【结论】对于天山北麓盐碱土,可设定为5∶1水土比,悬液充分搅拌后即进行pH值测定,其测定精度与实验效率均较高。
[Abstract]:[Objective] pH value is an important basis for the diagnosis and classification of alkaline earth. The pH value of soda Salinization Soil in the northern foot of Tianshan Mountain was measured, and the influencing factors were analyzed to provide the basis for the adaptation method of pH value in saline alkali soil. [method] by Potentiometric method, the carbonate content of Tianshan Mountain in Xinjiang, a typical high alkalinity and salt type complex saline alkali soil samples, respectively set up different ratio of water (1: 1, 2.5, 1, 5, 1) and different incubation time (1, 5, 10, 30 and 60min) for the determination of pH value. [results] the 1 ratio of soil pH value has a great influence and determination, but not the dilution effect of basicity of the decisive factor, chloride salt samples containing more CaCO_3 dilution effect is strongest, the maximum pH value increased to 0.57 units, the dilution effect mainly from hydrolysis of soda and sodium salt of CaCO_3 neutral reaction. 2 the solubility of insoluble salts is basically stable when the ratio of soil and water to soil is 2.5 to 1, and the ratio of soil and water of 1 to 1 is not suitable for the determination of pH value of salinized soil in the study area. The influence of 3 static time on the determination of the pH value of alkaline soil in Qitai is less than that of the salt soil of Ebinur Lake. The dissolution of CO_2 in the atmosphere does not affect the results of the pH value. [Conclusion] for the saline alkali soil in the northern foot of Tianshan Mountains, it can be set to 5: 1 water and soil ratio, and the pH value is determined after the suspension is fully stirred. The accuracy and efficiency of the experiment are relatively high.
【作者单位】：新疆大学资源与环境科学学院;新疆大学生态学博士后流动站;教育部新疆绿洲生态重点实验室;
【基金】：国家自然科学基金项目(41261049,41130531) 中国博士后基金面上资助项目(2013M532100)~~
【分类号】：S156.4
【正文快照】： 0引言【研究意义】土壤p H值表示土壤酸碱程度,它对土壤的许多化学反应、化学过程、养分利用等均有很大影响,是表征盐碱土基本性质不可或缺的核心指标之一,是碱土诊断及分类的重要依据[1-2]。盐碱化土壤中存在着剧烈的离子交换、沉淀溶解、水解等过程,p H值受到土壤内在性质和

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