神农架南坡常见花粉的R值研究

根据表土花粉分析和植被样方调查，对神农架南坡常见花粉的Ｒ值作了研究，结果表明：大部分阔叶花粉如栎、山毛榉、槭、鹅耳枥、榛、胡桃、枫杨、枫香、杜鹃、木兰、冬青、漆树、栗、榆具有低代表性，只有桦具有适宜代表性。针对有气囊花粉一般具有超代表性，而草本花粉的代表性变化较大。研究过程与结果还揭示出影响Ｒ值大小的四个主要因素是花粉源距离，外来花粉，花粉产量与植被样方面积。

A STUDY ON THE REPRESENTATION OF SOME MAIN POLLENS IN SHENNONGJIA REGION

The representation of some main pollens in Shennongjia region is studied according to analysis of soil and plantation samples. The result shows that most of broadleaf tree pollens such as Quercus, Fagus, Acer, Carpinus, Corylus, Juglans, Castanea, Ulmus, have a under representation and main conifer tree pollens such as Pinus, Abie and Picea have a over representation. Distance from pollen sourece, external pollen, pollen output and platation sample area are main influence factors on representation of pollen.