不同化学改良剂对重度苏打盐化土改良机理模拟研究

发布时间：2018-06-04 14:37

本文选题：重度苏打盐化土 + DS-1997　；参考：《山西大学》2015年硕士论文

【摘要】：本文通过原状土柱淋洗试验方法,在室外模拟大田改良重度苏打盐化土。测定了DS-1997、脱硫石膏、硫酸亚铁三种改良剂三种不同的施用量对重度苏打盐化土的pH值、EC值、水溶性八大离子、交换性钠含量、ESP、有机质含量、全氮含量、有效磷含量、速效钾含量以及容重、饱和导水率的影响。旨在为大同盆地苏打盐化土改良提供理论支持和借鉴。结果表明：1、施用DS-1997可以有效的降低重度苏打盐化土的pH,增加表层0～10cm土壤的EC值,降低底层20～40cm土壤的EC值,并且施用量越大,土壤pH降幅也越大。0～20cm土壤中SO42-的含量增加了,C1-变化无明显规律；20～40cm土壤中CO32-和Na+含量增加了。0～30cm土壤中的交换性钠含量和ESP降低了,30～40cm土壤交换性钠含量和ESP有所升高。土壤有机质、全氮、有效磷、速效钾含量增加了,土壤容重降低了,饱和导水率提高了。2、施用脱硫石膏可以有效的降低重度苏打盐化土的pH,并且施用量越大,土壤pH降幅也越大。在短时间内,会增加表层土壤的EC值。0～10cm土壤CO32-和HCO3-大幅减少了；10～20cm土壤八大离子含量均有所上升；20～40cm土壤Ca2+Mg2+、CO32含量降低了。0～20cm土壤中的交换性钠含量和ESP降低了,20～40cm土壤交换性钠含量和ESP有所升高。土壤有机质、全氮、有效磷含量增加了,速效钾含量减少了。土壤容重降低了,饱和导水率提高了,并且表层土壤变化幅度最大。3、施用硫酸亚铁可以有效的降低重度苏打盐化土pH值,施用量越大,降幅越大,EC值增加了。0～10cm土壤Ca2+、HCO3-、Cl-、Na+含量减少了；10～20cm土壤HCO3-含量减少了；20～30cm土壤Ca2+、HCO3-、Cl-含量减少了；30～40cm土壤HCO3-和Na+含量减少了。0～20cm土壤交换性钠含量和ESP降低了,20～40cm土壤交换性钠含量和ESP有所升高。土壤有机质、全氮、有效磷以及20～40cm土壤速效钾含量增加了,0～20cm土壤速效钾含量降低了。土壤容重降低了,饱和导水率提高了,并且表层土壤变化幅度最大。
[Abstract]:In this paper, the original soil column leaching test method was used to improve the severe soda salinized soil in outdoor simulated field. The pH value, EC value, water soluble eight ions, exchangeable sodium content, ESP, organic matter content, total nitrogen content, effective phosphorus content of the severe soda salinized soil were measured by three kinds of amelioration of three kinds of amelioration agents. The amount, the content of available potassium and the effect of the bulk density and the saturated water conductivity. The purpose is to provide theoretical support and reference for the improvement of the soda salinized soil in Datong Basin. The results show that: 1, the application of DS-1997 can effectively reduce the pH of the severe soda salinized soil, increase the EC value of the soil in the surface layer of the surface, and lower the EC value of the soil with the bottom 20 ~ 40cm, and the more the application amount is used, The content of SO42- in soil pH increased in.0 ~ 20cm soil, and the content of CO32- and Na+ in 20 ~ 40cm soil increased in.0 to 30cm soil. The content of exchangeable sodium and ESP decreased in the soil of.0 to 30cm, and the content of exchangeable sodium in the 30 ~ 40cm soil and the increase were increased. The content of soil organic matter, total nitrogen, available phosphorus and available potassium increased. The soil bulk density decreased and the saturated water conductivity increased by.2. The application of desulphurization gypsum could effectively reduce the pH of severe soda salinized soil, and the greater the amount of pH, the greater the decrease of soil pH in the soil. In a short time, the EC value of the surface soil could be greatly reduced by CO32- and HCO3- in.0 ~ 10cm soil; the contents of eight major ions in 10 ~ 20cm soil were all some The content of exchangeable sodium and ESP in the soil of.0 ~ 20cm decreased, and the content of exchangeable sodium and ESP in the soil of 20 to 40cm were reduced, and the content of exchangeable sodium and ESP in 20 to 40cm increased. The content of soil organic matter, total nitrogen, available phosphorus increased and the content of available potassium decreased. The soil bulk density decreased, the saturated water conductivity increased, and the surface soil soil was increased in 20 ~ 40cm soil. The maximum change range.3, the application of ferrous sulfate can effectively reduce the pH value of severe soda salinized soil, the greater the application amount, the greater the decrease, the EC value increases.0 to 10cm soil Ca2+, HCO3-, Cl-, Na+ content decreases; 10 ~ 20cm soil HCO3- content decreases; 20 ~ 30cm soil, decreased content, 30 ~ soil soils and content content decreases Soil exchangeable sodium content and ESP decreased in.0 ~ 20cm. Soil exchangeable sodium content and ESP increased in 20 to 40cm. Soil organic matter, total nitrogen, available phosphorus and 20 ~ 40cm soil available potassium content increased. Soil available potassium content in 0 ~ 20cm decreased. Soil bulk density decreased, saturated water conductivity increased, and surface soil changes The maximum amplitude.
【学位授予单位】：山西大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S156.4

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