古红果榆适生区及其再生体系探索

To determine the suitable distribution of Ulmus szechuanica and find out the best propagation method for it,the paper applied ArcGis and MaxEnt to figure out the suitable distribution of U.szechuanica based on its distribution and climate environment information and picked shoots of 1 year old and 2 years old stems at different periods and selecting the appropriate concentration of auxin and treating time.The results showed that:①The suitable distribution of U.szechuanica is around south of the Yangtze River in the central and East China,while North of Yangtze River,Tibet,Yunnan and South China are not so suitable for distribution,and it is not suitable for the introduction of U.szachuanica.②Both sexual and asexual reproduction methods are feasible for Ulmus szechuanica.The survival rate of seed propagation was not high so sexual reproduction is not suitable for rapid,cheap and large-scale cultivation,but it is feasible to preserve its excellent germplasm resources.The 2-year-old branches of U.szechuanica were suitable for cutting propagation,and the best treatment concentration is 100mg/L NAA:IBA=9:1solution for 25mins,the rooting rate can reach 44%,which is ideal for cutting of U.szechuanica.