Population structure and dynamics of wild Acanthopanax senticosus in different regions of Northeast China
[Objective]This study aims to analyze the structural characteristics of wild Acanthopanax senticosus population in Northeast China,clarify its survival status and predict the future succession trend,so as to provide scientific basis for conservation,utilization and sustainable development of A.senticosus population in Northeast China.[Method]Survey sample plots were set up in representative habitats in Xiaoxinganling,Zhangguangcailing and Changbai Mountain and the plants in the sample plots were surveyed.Based on sample survey and data statistics,the age structure of wild A.senticosus was mapped,its static life table was compiled,survival and mortality curves and survival function curves were fitted,and survival analysis and quantitative dynamic parameters were used to predict population development trend.[Result](1)The age structure of wild A.senticosus population in the three regions was similar to a"pyramid"type,and the number of young and mature plants accounted for 68.58%-83.04%of the total number of the species and the age structure of the population was stable.(2)In the three regions,the dynamic indices of quantitative changes in the population structure(Vpn)and the population age structure index considering future external interference(V'pn)were greater than 0,and the survival curves tended to be Deevey-Ⅱtype,indicating a growth type with high sensitivity to external interference.(3)In the three regions,the number of plants at the 1st age level was significantly lower than that at the 2nd and 3rd age levels,indicating that the low rate of seed germination was currently a bottleneck for the population renewal and development.The population in all the three regions gradually decreased in the early stage and stabilized in the later stage,but the risk rate gradually increased,indicating a decline trend in the population in the later stage.[Conclusion]At present,the population structure of wild A.senticosus in the three regions is of a growth type,but the number of young plants is small and the development potential of the number of old individuals in the population is small.It is difficult to maintain an overall long-term stability of wild A.senticosus population.It is recommended to strengthen the precise nurturing and management of 1-year-old individuals,improve the seedling preservation rate through artificial measures,and promote the sustainable development of wild A.senticosus population.[Ch,3 fig.5 tab.35 ref.]
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