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Characteristic Analysis Of Saline-alkali Soil And Effects Of Isolated-layer Management Technology On Desaltingt In Coastal Area Of Tianjing

Posted on:2014-04-15Degree:MasterType:Thesis
Country:ChinaCandidate:P H ZhaiFull Text:PDF
GTID:2480303965952169Subject:Soil science
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In order to proposing reasonable afforestation programs targeted at the saline soil in Dagang District, Tianjin City, correlation analysis and principal component analysis (PCA) were used to estimate the characteristics of soil. The results showed that, the soil type was chloride saline with total salt content, Cl-?K++Na+?Ca2+and Mg2+as the characteristic factors of the soil salinization.Based on the above conclusions, this study compared ceramicite, vermiculite, zeolite, sepiolite (low-cost?) and traditional sand as the salt-isolated layer in the same position and thickness on the ef feet of reducing soil salinity through an indoor simulating soil columns experiment. The results illustrate d that those different interlayer restrained water evaporation. All interlayer treatments showed salt accu mulation effect in different extent except ceramicite, attributing to capillary water upward rate in control> sepiolite> vermiculite> zeolite> ceramicite in evaporation stage. Therefore, the interlayer of cerami cite was far better than traditional sand on restraining capillary water upward in Tianjin coastal regions.For the treatments we chose ceramicite, vermiculite and zeolite as the salt-isolated layer at the bottom and side wall of planting hole. On this basis,Sophora japonica L. was planted, and then the dynamic changes of soil salinity and growth of plants were measured every month. At the same time, we analyzed the effects of reducing the salt and growth of Sophora japonica under different treatments. After the whole year measurement, the results showed that salinity accumulation and desalinization of surface soil were influenced by periodic property of local climate conditions. The salt accumulation peak period appeared at the end of spring and summer. Those three amelioration ways had significant effects on the main salt ions, total salt content and growth of sophora japonica. Zeolite was not only the most effective salt-segregation material, but also the most useful material for accelerating the rate of plant growth.
Keywords/Search Tags:Coastal saline-alkali area, salt-isolation layer, ceramicite, vermiculite, zeolite, water-saline dynamics, Sophora japonica L.
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