Study on Change of Soil Organic Matter in the Process of Wetland Ecological Restoration in Ruoergai Plateau

The change of quantity, quality and distribution, of soil organic matter in the process of wetland ecological restoration was studied with field investigation and laboratorial analysis and the effect of ecological restoration on soil fertility in Ruoergai Plateau was expored. The results indicated that there was an ecological succession of wetland soil types and their restoration successive series showed aeolian sandy soil→meadow soil→bog soil→peat soil in the process of wetland ecological restoration. With the restoration of wetland ecosystem, the amount of soil organic carbon increased greatly and distribution characteristic of soil organic matter on profile showed surface layer (0-20cm)subhorizon (20-40cm)ground layer (40-60cm), the order of oxidation stability coefficient of soil organic matter was peat soilbog soilmeadow soilaeolian sandy soil and the oxidation stability of soil organic matter was enhanced. In the restoration successive series of aeolian sandy soil→meadow soil→bog soil→peat soil, the content of soil humic acid (HA) and E4 value of HA increased while E4/E6 value of HA decreased, the conent order of total acid group, carboxyl group and hydroxyl group was also peat soilbog soilmeadow soilaeolian sandy soil, the quality of soil humus improved. There was a high coordination between change of the quantity, distribution and quality of soil organic matter and wetland ecological environment in Ruoergai Plateau, wetland ecological restoration was helpful to the improvement of soil fertility.