Research On The Restoration Effect Of Arbuscular Mycorrhizal In Degraded Leymus Chinensis Typical Steppe

Leymus chinensis typical steppe, the best steppe in China, has been facing some degradation brought by both the nature and human beings. Arbuscular mycorrhiza (AM), as the important component for steppe ecosystem, plays a great role in strengthening the grass nutrition absorption, promoting the grass growth and increasing the stress resistance. Therefore, to restore the steppe with arbuscular mycorrhiza has become the best choice for recovering the whole ecosystem, the research is conducted under this background. Taking the Elitu grassland in the South Zhengxiangbai Banner, Xilingol League as a research target, this thesis does the restoration research through planting Leymus chinensis with mycorrhiza. Through comparing the soil, Leymus chinensis and community indicators with mycorrhiza and those without mycorrhiza, the thesis aims at exploring the restoration effect brought by mycorrhiza. The main results are as follows:(1) Both of the two groups show 0-10 cm spore density with the soil moisture content, nutrient and glomalin content remaining high; To inoculate AM fungi can increase the contents of soil organic carbon, available N, available P, available K, easily extractable glomalin(EEG) and total glomalin (TG) in rhizosphere of Leymus chinensis.(2) To inoculate AM can increase the height, coverage and shoot yield of the Leymus chinensis, thus further increasing the contents of protein and nutrient within the Leymus chinensis, enhancing the absorption of N, P and K and lowering the important values of Leymus chinensis for community.(3) To inoculate Leymus chinensis can also fasten the community growth, diversify the community species, and promote the formation of plant diversity in the community.