Effects Of Differernt Improvement Measures On Mowing Pasture Community In Leymus Chinensis Meadow Steppe

Grassland ecosystem is an organic whole composed of grassland and environment.The restoration of degraded grassland is closely related to its stability.In order to determine the best improvement measures suitable for Leymus chinensis population reproduction and restoration of degraded mowing grassland,this article takes the Hulunbeier Leymus chinensis grassland grassland mowing as an object to study the response of plant communities to different improvement measures;to explore dominant species of Leymus chinensis under different improvement measures The characteristics of the population,the number of communities,the important values of each life form plant,the number of species,and the changes in the diversity of the community have obtained the following main research results:1.The root-cutting treatment increased the height and density of Leymus chinensis populations,and significantly increased the important value of grass species,mainly Leymus chinensis(P<0.05).Increasing the proportion of Leymus chinensis biomass in the community reduced the Leymus chinensis population and Community biomass and root cutting also reduced the community species dominance index but had no significant effect on the change of community species number.2.Cutting root combined with chemical fertilizer application significantly increased Leymus chinensis population height,coverage and density(P<0.05).The biomass and community biomass of Leymus chinensis reached by cutting root+N2P2(150kg/hm2 urea;90kg/hm2 diammonium phosphate)treatment.highest.Cut root+N3P3(urea 225kg/hm2;diammonium phosphate 135kg/hm2)treatment significantly optimized the community structure,the community diversity change was effectively improved,the number of community species was the lowest,and the community height,coverage and density were significantly increased(P<0.05)).3.Root cutting+OR3(effective nutrient dosage 190)treatment can significantly increase Leymus chinensis height,coverage,density,and biomass(P<0.05),the number of community species is significantly reduced under its disturbance,and the change of community diversity is effectively improved and improved poaceae plants important values and reduce the proportion of legumes and compositae in the community(P<0.05).Increasing the community yield while reducing the proportion of weed biomass(P<0.05).4.The improvement effects of different improvement measures on Leymus chinensis steppe are root cutting+organic fertilizer>root cutting+chemical fertilizer>root cutting.Cutting root+N2P2(urea 150kg/hm2;diammonium phosphate 90kg/hm2)and cutting root+OR3(effective nutrient content 190)are the optimal treatments in the corresponding improvement measures,and have the best effect on the restoration and improvement of degraded Leymus chinensis steppe.