论文部分内容阅读
利用比重瓶法对火山喷出物发育土壤的比重进行测定,结果表明:玄武岩质火山喷出物发育土壤的比重大于粗面岩质火山喷出物发育土壤的比重;基于粒径小于1 mm土粒测定的比重,玄武岩质火山喷出物和粗面岩质火山喷出物发育土壤的比重均小于一般土壤的平均比重2.65 g cm~(-3);基于粒径小于0.1 mm土粒测定的比重,除个别玄武岩质火山喷出物发育土壤外也小于2.65 g cm~(-3)。分别取比重值为2.65 g cm~(-3)、粒径小于1 mm土粒的实测比重和粒径小于0.1 mm土粒的实测比重,计算不同粒级土粒的沉降时间,并进行颗粒组成的实验研究表明:取不同比重值测定的土壤颗粒组成含量相差较大而且影响土壤质地定名。由于成土母质的矿物组成决定土壤的比重,且土壤颗粒组成的静水沉降实验是在粒径小于0.1 mm土粒的悬液中进行的,所以,准确测定土壤颗粒组成含量,需要区分成土母质的矿物组成,并测定其小于0.1 mm粒径的土粒比重,重新计算沉降时间。
Pycnogenol method was used to determine the specific gravity of volcanic soil. The results showed that the specific gravity of soils developed from basalt volcanic eruptions was larger than that of volcanic eruptions. Based on the grain size less than 1 mm The specific gravity of the pellets, basaltic volcanic eruptions and littoral volcanic eruptions were all less than the average soil specific gravity of 2.65 g cm -3. Based on the soil particle size less than 0.1 mm The specific gravity, except for individual basaltic volcanic emanations, is less than 2.65 g cm ~ (-3). The specific gravity of 2.65 g cm -3, the measured specific gravity of soil less than 1 mm and the measured specific gravity of soil less than 0.1 mm were calculated respectively, and the sedimentation time of soil particles with different grain size was calculated. The experimental study shows that: take different proportion value of the determination of the soil particle composition vary greatly and affect soil texture naming. Since the mineral composition of the parent material determines the specific gravity of the soil and the hydrostatic sedimentation of the soil particles is carried out in a suspension of particles with a particle size of less than 0.1 mm, accurate determination of the soil particle content requires a distinction between soils Mineral composition, and measured its particle size less than 0.1 mm soil particle weight, recalculated settlement time.