根据表土孢粉分析和植被样方调查的比较研究,获得了神农架北坡表土常见花粉的R值。常绿阔叶树花粉一般具有较低代表性,R值变化于0.70左右。绝大部分落叶阔叶树花粉也具有较低代表性,R值变化于0.68~0.88之间,但桦、桤木和槭却表现异常。针叶树有气囊花粉具有明显的超代表性,R值变化在1.35~2.44之间,松表现最为强烈。草本植物花粉的R值变化较大,代表性较差。影响R值的因素很多,植物的生态特性、花粉特征、花粉源距离、花粉产量、地形等作用尤为明显。
The representation of common pollens in soils on the northern slope of Shennongjia mountains area is studied in the light of sporo-pollen analysis and plantation sample investigation.Most of broadleaved-tree pollens such as Quercus, Ilex, Fagus, Juglans,Castanea, Carpinus, Corylus, Ulmus, Tilia and Salix, have a under-representation except Betula and Alnus which have a suitable representation.Some main conifer-tree pollens such as Pinus, Abies and Picea, have a over-representation except Cupressaceae and Taxodiaceae which have a under-represeatation.The research shows that the representation of pollen is influenced from pollen character, external pollens, pollen output, distance from pollen sources and landform.
[1] 李文漪,等.中国北、中亚热带晚第四纪植被与环境研究[M].北京:海洋出版社,1993.14~26.
[2] Frits THM,Spieksma et al.Relationship between recent pollen and airbome pollen concentration[J].Rev.Paleobot.Palynol.,1994,(82):141~145.
[3] Mervi Hjelmroos,Lars G Franzen.Implication of recent long-distance pollen transport events for the interpretation of fossil pollen records in Fennoscandia[J].Rev.Paleobot.Palynol.,1994,(82):175~189.
[4] Pascale Ruffaldil.Relationship between recent pollen spectra and current vegetation around the cerin peat bog (Ain,France) [J].Rev.Paleobot.Palynol.1994(82)97~112.
[5] 刘会平,等.神农架南坡常见花粉的R值研究[J],华中师范大学学报,1998,32(4):495~497.
