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选择榆树种子与科尔沁沙地典型一年生草本植物狗尾草种子作为对象,研究榆树种子和狗尾草种子萌发的时间格局下,榆树幼苗的生物量、地上高度、根系长度、叶片数目的变化。结果表明:狗尾草种子先萌发的情况下,榆树幼苗生物量显著减少,而且地上高度明显增加。与狗尾草种子同时种植以及先于狗尾草种子种植的情况下,榆树幼苗生长状况差异不显著。因此,为促进榆树的更新,在榆树落种期结束后、大部分榆树种子萌发前,可以适度地进行放牧活动,通过抑制其他草本植物的生长,为榆树更新创造条件。
Ulmus seed and Hormones sandy grass, a typical annual genus of Setaria viridis, were selected to study the changes of biomass, aboveground height, root length and number of leaves of elm seedlings under the temporal pattern of seed germination. The results showed that the biomass of Ulmus pumila was significantly reduced and the height above ground significantly increased under the condition of germination of Setaria viridis. In the case of Simsii seeds planted simultaneously with the plants of Setaria viridis, there was no significant difference in the growth of Ulmus przewalskii seedlings. Therefore, in order to promote the regeneration of Ulmus pumila, most elm seeds can be grazed before the end of elm deciduous period, and create the conditions for elm regeneration by inhibiting the growth of other herbaceous plants.