Effect Of Flue Gas Desulfurization Gypsum On Plants Stress-resistance And Soil Physic-chemical Properties

The problem of soil Salinization has been a major problem affecting the production of agriculture. There are about 380 million hm2 land with different degrees of salinity which is accounted for 10 percent of the cultivated land area. How to improve the salt tolerance of crops and the biological control and comprehensive development of saline soil is a major task for the future agriculture; On the other hand, the secondary pollution problems with flue gas desulfurization gypsum which is a byproduct of Wet flue gas desulfurization has been attracting increasing attention. The flue gas desulfurization gypsum has characteristics that improving physical and chemical properties of soil and improving physiology characteristics of plant under adversity. With the features of flue gas desulfurization gypsum, we can introduce economic value of higher gypsum plant (such as medicago sativa) into degraded coastal wetlands, and then the vanguard plants will settle and propagate. The vanguard plants that introduced into can improve the environment that has been damaged, replace some or all of the other invasive species, and improve the environment and ecosystems further. Otherwise, using biological methods to control coastal saline soil will be avoiding the secondary pollution in the process gypsum storage. This paper use coastal saline soil of the Yellow River Delta as tested soil, and use medicago sativa as the trial plant to study the gypsum salt stress on the physiology of alfalfa and soil physical and chemical properties, the results of the study show that: Desulfurization gypsum can markedly improve the physiological function of salt that under salt stress and improve the biological production of alfalfa. and the physiological indices of its application to have a good relationship. Experiments show that: When the application rates of gypsum reaches 1500kg/15-1hm2, compared to the blank one, the dry biomass increase 60 percent significantly and the height of plant increase 51.2 percent, the water content increase 15.01 percent, the chlorophyll content increase 26.3 percent. at the same time the cell membrane permeability of Medicago Sativa, with gypsum volume also increased continuously decreased.Correlation analysis showed that: medicago sativa various physiological indicators and the application of gypsum both have a good correlation, so gypsum on the coastal saline soil in the development and use of a very important role and significance.Desulfurization gypsum can improve the physical and chemical properties of coastal saline soil obviously. It can reduce the pH and salinity of coastal saline soil, increasing soil organic matter and nutrients such as nitrogen and phosphorus. Experiment shows that: with the application of gypsum increased, the organic matter and nutrients such as nitrogen and phosphorus are an increasing trend, salinity and pH are on a downward trend. Correlation analysis showed that the application of gypsum and soil the majority of characters are well correlated, the total salt of soil, organic matter and nitrogen come to a very significant level. Principal component analysis showed that the first principal component that affect medicago sativa production is the application of gypsum, salt in the soil and nitrogen content, the second principal component is the soil phosphorus content, So when we explore the coastal areas, we should increase the organic base fertilizer and the phosphate fertilizer to achieve better results.