【摘要】 观察了北极巴罗(Barrow)地区2种灌木植物,全缘叶仙女木(DryasintegrifoliaM.Vahl)和圆叶柳(SalixrotundifoliaTrautv.)的形态、生境以及它们的花粉形态。这2种植物形态矮小或匍匐蔓生;全缘叶仙女木叶短小似披针状或扁平,全缘;圆叶柳叶圆形,叶脉显著,根、茎、叶均含丰富Vc。它们的花粉形态为球形、近球形或长球形,其萌发孔均为三孔沟或拟三孔沟,花粉均为辐射对称。全缘叶仙女木花粉外壁纹饰在光学显微镜下(LM)为细网状纹饰,在扫描电子显微镜(SEM)下为条纹状纹饰;圆叶柳在LM和SEM下均为细网状纹饰。通过与中国产和日本产相似种的比较研究,显示它们应是温带亚洲高山起源及部分起源于北极本部。更多还原

【Abstract】 The studies of plant morphological features, pollens and habitats have been made for two shrub species from Barrow, Arctic. They are Dryas integrifolia M.Vahl and Salix rotundifolia Trautv. The former with small lanceolate or plate leaf, while the latter has the rounded leaves of distict veins, riched in Vc. Both of them have dwarf and sprawling habits. The pollen studies showed that their pollen grains are spheroidal to subspheroidal or prolate. The type of apertures are tricolporate. Ornamentation finely reticulate in light microscope (LM), striate-reticulate in scanning electron microscope (SEM) in D. integrifolia; finely reticulate both in LM and in SEM in S. rotundifolia. On the basis of comparison of the pollens in same species from Arctic collections with those from China and Japan′s, it showed that the two species probably originated from subalpine zone in temperate Asia or partly from Arctic. Investigation on pollen morphology of tundra can provide significant data for comparative study of fossil pollens and reconstruction of paleovegetation and paleoclimate in the Barrow Area.更多还原