The Effect of Root Cutting and Fertilization on the Yield and Bud Bank of Leymus chinensis Artificial Grassland
In order to solve the problem that the yield decreased and the productivity weakened after years of utilization of dryland Leymus chinensis artificial grassland,this study took the degraded Leymus chi-nensis artificial grassland as the research object,and set up three treatments:control(no root cutting,no fertilization),root cutting+urea,and root cutting+diammonium phosphate,to study the effects of differ-ent improvement measures on functional trait,population characteristics,bud bank number and endogenous hormones of Leymus chinensis.The results showed that cutting root+urea and cutting root+diammonium phosphate treatments had significant effects on the functional traits of Leymus chinensis.Stem diameter,plant height,leaf width and leaf number per plant under treatment of cutting root and fertilization were sig-nificantly higher than those under control.Stem diameter,plant height and leaf width were the highest under the treatment of cutting root+urea(1.67 cm,48.55 cm and 0.65 cm,respectively),which were increased by 60.57%,52.77%and 44.50%compared with control.Root cutting and fertilizer treatments increased vegetative branch height,reproductive branch height,shoot number and hay yield of Leymus chinen-sis.The increase in root cutting and urea treatment increased the highest,with a hay yield of 359.00 g/m2,an increase of 85.24%.The treatment of root cutting and diammonium phosphate significantly increased the number of underground bud banks in the artificial grassland of Leymus chinensis,reaching 458 buds/m2,an increase of 129.00%compared to the control.In addition,the root cutting and diammonium phosphate management measures significantly increased of JA and IAA content in the rhizomes of Leymus chinensis,and there was a significant positive correlation between the JA and IAA content in the rhizomes and the number of bud banks.Overall,root cutting and fertilization management was an effective measure for the management of degraded Leymus chinensis artificial grassland.
Root cuttingFertilizationLeymus chinensis artificial grasslandBud bank
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