Effect of Different Drought Stress on Seedling Growth and Physiological Characteristics of Cenchrus pauciflorus Benth

As a kind of invasive alien plants, the Cenchrus pauciflorus Benth. is spreading in the range of sandy grassland in Liaoning, which reduced the biodiversity of grassland, and greatly affected the ecological environment of grassland. It is of great significance to understand the distribution of biomass and physiological characteristics in the management of grassland and the improvement of the ecological environment of the grassland. The experiment was conducted to study the effects of drought stress on the biomass allocation and physiological characteristics of its seedlings in different soil substrates. The results show that the effects of drought stress on sandbur seedling root, stem, leaf, spike biomass distribution and physiological characteristics of seedlings significantly in two different soil matrix, the distribution of each component of the plant biomass are peat soil > sandy soil; effects of drought stress on plant biomass allocation of two the soil quality, the specific performance of mild drought stress > control group > under moderate drought > severe drought stress. In terms of physiological characteristics, with the deepening of drought stress and the prolongation of drought stress, the malondialdehyde content, relative leaf water content, and SOD activity of plants gradually increased, and peat soil was larger than aeolian sand soil. The analysis thinks, the physiological characteristics of two kinds of soil matrix sandbur plant components and biomass distribution of seedlings showed strong drought resistance and adaptability of the environment makes it to the poor soil diffusion growth potential.