Research On Classifications And Biological Features Of Syringa Plants In Areas Of Baotou City

Characterized by lush branches,elegant colors and being fragrant,tolerant to cold and drought,demanding less from soil,Syringa is the major species for reforesting,beautification and fragrance in the world.It's easy confused of different varieties because of similar characters between them.Therefor,the index of the growing features of 14 species of Syringa in Baotou city Inner Mongolia have been explored and examined,the following shows the results.1.Sprouting of different species leaf buds are very differently.S.persica L.and Syringa pinnatifolia Hemsl sprout late,almost one month later than Hong Syringa reticulata. Sprouting time of other species are almost similar from late March to early April.The sprouting and leafing time interval for S.persica L.and Syringa pinnatifolia Hemsl follows quite closely which is one-week or so,while the time interval for other species quite distantly which is about 15 days.2.S.oblata flowers earliest,on May 1st or so,while S.reticulate var.amurensis at the latest,on about June 16th,and its flowering time can last till July 9^th.Group flowering time for Syringa in garden can last for about 70 days3.single-factor variance analysis of 7 species of S.oblata '.Zi Yun',S.oblata 'Luo Lan' S.oblata 'Buffon',S.chinensis will,S.oblata var affinis 'Chang Tong',S.oblata '.Xiang Xue',S.oblata Lindl has been made in terms of their flowering periods.The result shows variance in different varieties,but the variance is not noticeable between S.oblata '.Luo Lan' and S.oblata '.Xiang Xue',nor is among S.oblata '.Xiang Xue',S.oblata varaffinis '.Chang Tong' and S.oblata Lindl,the same is true with S.oblata 'Zi Yun',S. oblata var affinis '.Chang Tong' and S.oblata Lindl,which have the shortest flowering periods.4.Among the 14 species,only S.oblata Lindl,S.amurensis Rupr,S.microphylla Diels,S. wolfii Scheid and S.villosa Vahl normally bear fruits,while the rest either bear no fruits or once in a while.5.The defoliation of Syringa is short,only lasting about 3 to 5 days.All the leaves could fall down naturally,which indicates that it can sense photoperiod,and adapts climate in Baotou...