Impacts Of Moving Krascheninnikovia Ceratoides On Rhizosphere Soil Microenvironment In The Steppe Desert

Krascheninnikovia ceratoides not only serves as a good forage grass, but also creates a significant ecological barrier, which can maintain the stability of the desert-steppe ecosystem by effectively inhibiting soil erosion. Moving leads to plant regrowth and stimulates the secretion of carbohydrates from plant roots. Once the aboveground biomass of plant is damaged, its underground soil properties may change. Rhizosphere soil is of great importance because it serves as a microenvironment where plant, soil, and microorganisms can carry out nutrient cycling, the exchange of energy and the passing of information. Therefore, rhizosphere soil is strongly affected by plant roots and the activity of microorganisms. There currently is no research regarding moving on the rhizosphere soil properties of K. ceratoides. Therefore, a study of the impacts of moving on the rhizosphere soil microenvironment of K. ceratoides could reveal the influence moving has on its underground biomass. Furthermore, it also can serve as a basic reference for putting K. ceratoides resources to rational use.In order to analyze the impacts of moving on soil properties of K. ceratoides in the steppe desert, the soil physical and chemical properties, as well as the soil microorganisms and soil enzymatic activity, were investigated after two years in a row moving treatments during autumn. We also studied the compensatory growth of K. ceratoides, root exudates and the correlation analysis of each measurement indicator above. The specific conclusions as follows:(1) Moving increased the underground biomass of K. ceratoides. In the process of growth recovery, there was more organic matter storing in the root.(2) Moving would contribute to the increasement of soil organic matter and soil organic carbon in the soil in the zone, but it did not have a obvious effect in the rhizosphere soil. Limited by the low soil organic matter content in arid and semiarid region, the effectiveness of K. ceratoides community soil nutrients changed little.(3) Moving improved the number of rhizosphere soil fungi and the total plate count of soil microorganisms. However, the effects of moving on the microbial C content and soil enzymatic activity including Hydrogen peroxidase, Alkaline phosphatase, Urease, and Invertase were not significant.(4) The exudates of K. ceratoides root were more various under moving treatment compared to those under unmoved treatment, which included vinyl compounds, alcohol compounds, ester compounds and their derivative. What is more, there was inhibiting substance in the root exudates of moving and control treatments. It could be a reason why there was more soil actinomyces in this area.(5) The soil organic matter had a high positive correlation with soil microorganisms and soil enzymatic activity, which indicated that they were affected by the content of soil organic matter.