Comparative study on soil mechanical composition in steppe zone of Mongolia plateau (on the example of inner Mongolian uzemchin - Mongolian Sukhbaatar province)

Soil erosion and destruction is well known, but there are different rates of tendency of soil mechanical composition of the same region. In this paper, the same grassland regions in different countries were selected as the study area: the Uzemchin region of the Inner Mongolia, China and the Sukhbaatar province, Mongolia. The soil mechanical composition in the research area was determined through the field survey and laboratory analysis. Soil texture classifications in study area consists of clay, loamy sand, loam, sand, sand clay, sandy loam, silt, and silt loam, but the ratio of silt loam and sandy loam are significant, 48% and 25% respectively. Changes of average sand along the north-west direction from the southeast of in the research area tends to reduce, but changes of average clay tends to increase and changes of average silt tends to increase slightly. Chang of sand and clay tend to increase in the Uzemchin region of the research area along all soil layers, while silt tends to reduce in the Uzemchin region. But they tend to be stable relatively in Sukhbaatar region of the research area. Therefore, the quality of the soil mechanic composition of the research area in Mongolia is better than the research area in Inner Mongolia. However, the two regions have similar natural conditions. The differences of soil separate tendency found between Sukhbaatar, Mongolia and Uzemchin, Inner Mongolia in the research area will be analyzed in the next research.