Germination characteristics of naturally dropped seed of Malus sieversii
[Objective]To investigate the germination characteristics of naturally dropped seed and the influencing factors in the original habitat of Malus sieversii,the findings can provide a theoretical references for the natural regeneration management and protection of this species.[Method]In the wild fruit forests of Xinyuan county,Xinjiang,we selected three habitats for natural disturbance:the forest understory,the forest gap and the forest glade,and a fence nursery for protection.On this basis,we sowed six seeds of M.sieversii(the seeds of fresh fruit,the seeds of broken fruit,the seeds of rotten fruit,the seeds of dried fruit,the seeds of fruit core and the seeds of naked)to observe the germination and seedling survival in the two-year growing seasons.[Result]After sowing the six seeds in autumn,when all of them started to sprout in mid-April of the following year,and the sprouting ended in mid-to early-May.The six seeds appeared to sprout consecutively in two years,among which the sprouting rates of fresh fruit seeds,rotten fruit seeds and dried fruit seeds all were higher than those of the first year.Derived from two years of data:the naked seeds firstly sprouted in the original habitats,and the natural sprouting rates of them in the forest understory,forest gap,forest glade and fenced nursery were respectively 86.67%,95.56%,91.11% and 91.11%,which were significantly higher than the other seeds,but there was no significant difference among the four habitats.The natural germination rate and seedling survival rate of all types seeds under the natural disturbances of the original habitats(forest understory,forest gap and forest glade)were respectively 33.33% and 20.26%,which were significantly lower than the natural germination(44.41% )and seedling survival rates(73.36% )in the fenced nursery respectively.The survival rate of seedlings in the forest gap was the highest,which was 40.74%,and there were no surviving seedlings in the forest understory.The frequently rainfall and persistent high temperature weather and excessive depression,could significantly inhibit the germination and seedling growth of M.sieversii.[Conclusion]The naked seeds were the best seed type for natural regeneration of M.sieversii,and the forest gap were the most suitable habitat for seedling germination from naturally deposited seedling of M.sieversii.The seed appendages inhibited seed germination,and high humidity in spring and high temperature in summer,as well as stand depression,animal feeding and trampling were the main barriers to seedling germination of M.sieversii.
万方数据
维普
