Study On The Mechanism Of Weathered Coal On The Improvement Of Soda-saline Soil

Soil salinization has been a serious threat to global ecological security and agricultural development.The soil contained a large amount of soda soda saline soil has become a major threat to inland agricultural development.According to soda saline soil of the Shanxi Datong Basin,selecting rich Lingshi weathered coal as modified materials,Through laboratory incubation experiment and Undisturbed soil simulation test in Datong basin,analysis of soil physical,chemical and nutrient index and plant growth index.To explore the improvement effect of weathered coal on inland salinized soil,to determine the optimal dosage of weathered coal in Datong Basin improvement of soda saline soil.In order to provide theoretical basis for China's inland salinized soil chemical modification.The main results are as follows:(1)Weathered coal and soda saline soil were cultured in the humid environment of Constant temperature artificial climate box,research results show that added weathered coal can significantly reduce soda saline soil pH value,and it is a very rapid process.Excessive addition of weathered coal has significantly increased the risk of salt content in soda saline soil.The effect is best when the amount of weathered coal is used in 15g/kg,compared with the original soil its ESP decreased by 34.6%.The addition of weathered coal can effectively lower the content of CO32-and Na+ in the soil,the Na+ content of 15g/kg treatment decreased 15%compared with that of the original soil after 12h.Weathered coal can effectively improve the physico-chemical properties of soda saline soil.(2)For further study of the mechanism of weathered coal for the improvement of soda saline soil,using undisturbed soil column experiments,in-depth study of the weathered coal on the soda soil salt movement effect.At the same time weathered coal can reduce the soda saline soil in the water soluble content of CO32-.At the same time,weathered coal can effectively reduce the water soluble Na+ content in the soil,the effect is best when 15 g/kg,compared with the Na+ in the CK soil decreased by 28.4%.So weathered coal can significantly reduce the water soluble Na+ in the soil,improve the structure of the soil.Weathered coal can effectively reduce the salt in the surface soil,lOg/kg and 15 g/kg treatment make 0-10 cm salt from 39%of the total content of the soil decreased to 7.4%and 7.6%,weathered coal can prevent the lower layer of salt transport to the surface soil.(3)Weathered coal can significantly improve the physical properties of Soda saline soil,reducing soil bulk density,the treatment of 15g/kg compared to CK,bulk density is reduced by 6%,Improve three phase ratio of soil,increase the total porosity of 0-10cm soil?The total porosity of CK was increased by 18%compared with 15g/kg.At the same time weathered coal significantly improved the soil saturated hydraulic conductivity,physical structure and moisture characteristics of soda saline soil?(4)Weathered coal can significantly improve soda saline soil fertility,soil organic matter,total nitrogen and phosphorus content in soda saline soil?Meanwhile,it promotes the growth of crops,can effectively improve the emergence rate of maize.The height of maize and biomass of maize were significantly increased.