Study On The Dynamics Of Soil Characteristics Of Deteriorated Ecosystem Of The Typical Steppe In Inner Mongolia

Based on the documents of the past 20 years on soil characteristics of Leymus chinensis-Stipa grandis steppe in Xilinguole League in Inner Mongolia, the experiment was carried out to study the soil chemical characteristics of the same steppe. By comparing all the data, the changing regularity of soil characteristics of deteriorated ecosystem in the process of recovery was analyzed. The aim is to provide reasonable and scientific basis for grassland protection and usage. The results are as follows:(1) In the fence of Leymus chinensis steppe, the organic matter, total N, total P of soil are always in rise generally, and the variation of the contents in 0-10 cm soil profile below surface are very obvious and in 10-20cm are less obvious. But out of the fence, the organic matter, total N, total P of soil are falling and the changes among them are different.(2) In the fence of Stipa grandis steppe, the organic matter, total N, total P of soil are always in rise generally and the variation of the contents in 0-10 cm and 10-20cm soil profile below surface are very obvious. But out of the fence, the trend of organic matter, total N, total P of soil is falling in every layer, but the most significant change happens in 0-10cm profile below surface.(3) Both in and out of the fence, contents of soil organic matter, total N, total P of Leymus chinensis sample are higher than those of Stipa grandis sample and the distinct difference is 0-10cm between them.