Study On Soil Properties And Corrosion Resistance Of Soil Developed From Carbonate Rocks

Guizhou is the largest carbonate rock area in China and the most developed karst region,and the soil physical and chemical properties and corrosion resistance of different carbonate rocks are different.In this article,the natural soil formed by different carbonate rocks in Karst area of Guizhou is taken as the research object.Through field investigation,sample collection and indoor test,the physical and chemical properties and corrosion resistance of soil are tested and analyzed.Study on the accumulation of element migration during the development of natural soil formed by different carbonate rocks,the relationships between soil physical and chemical properties and the strong and weak changes in soil corrosion resistance,in order to clarify them to provides the valuable data information for the study of the physical and chemical properties of soil in different carbonate rocks in Karst area,At the same time,it provides a theoretical basis for the prevention and control of soil and water loss in this area and the prevention and control of rocky desertification.The study found that:The soil developed from carbonate rocks shows Al>Fe>Ca>Mg>Ti>P,and the characteristics of migration and accumulation indicate that Ca and Mg are leaching and migrating,the migration amount of Ca>Mg,Al and Fe show the characteristics of accumulation.Ti is relatively stable.With different carbonate rock production times,the rock mass itself has different compactness,and there are different soil properties in its development.The physical and chemical properties of natural soil formed by limestone and dolomite in different ages are quite variable.It is embodied in the following:(1)The soil bulk density which is in limestone area shows:Carboniferous > Permian > Triassic,in dolomite area shows: Devonian,Cambrian,Triassic,B layer bulk density is larger than A layer,and carbonate rock output age is older,and its soil bulk density is relatively large.(2)Soil mechanical composition which is in limestone area: the sand content shows: Triassic > Carboniferous > Permian,the powder content shows: Permian >Triassic > Carboniferous,the clay content shows: Carboniferous > Permian > Triassic.The particle content of A layer is higher than that of B layer,and the B layer is higher than that of A layer.At the whole level,the clay content of the older limestone developed in the production era is higher,and the content of sand is larger than that of the new limestone.In Dolomite area: the sand content shows: Triassic > Cambrian > Devonian,the powder content shows: Cambrian >Devonian > Triassic,the clay content shows: Devonian > Cambrian > Triassic.In general,in the production era,the content of powder and clay in the older dolomite was higher than that in the new dolomite,and the content of sand in the new dolomite was larger than that in the old dolomite.(3)The content of related chemical elements has great variability.There is no consistent rule of element change under the age difference,but there are significant differences between different levels of the same age.The physical and chemical properties of the natural soil formed by the development of limestone and dolomite which is in the same period of output are also large,and the content of the sand particles shows: Dolomite > limestone;the content of particles and the content of clay particles show limestone > dolomite.The soil of the carbonate rock region has a certain inheritance to the parent rock.The rock Ca is significantly positively correlated with soil Ca,significantly negatively related to the soil Mg,and the rock Mg has a significant negative correlation with the soil Ti.The rock Ti has a significant negative correlation with the soil Ti,and has a significant negative correlation with the soil Al,and the rock Al is negatively correlated with the soil Al.The comprehensive evaluation of soil erosion resistance in carbonate area shows that the soil erosion resistance of limestone is stronger than dolomite.The soil erosion resistance which is developed in different times limestone is: Carboniferous limestone > Permian limestone > Triassic limestone;The soil erosion resistance which is developed in different dolomite is: Devonian dolomite > Cambrian dolomite > Triassic dolomite.In general,the soil which is formed in the newly developed Triassic carbonate rocks have the weakest soil erosion resistance.