摘要
栎林是华北平原和关中平原占绝对优势的夏绿阔叶林。栎林类型多，发育的气候条件差异较大，它主要是温暖气候或间冰期气候的植被，但也有的栎林发育在接近冰期的寒冷条件下。区分不同的栎林对深人研究第四纪气候具重要的意义。本文根据不同标林中伴生的植物差异，论述了不同栎林的组成特点及其和气候的关系、辽东栎林的孢粉组合特征。
Five kinds of oak forest develop in the area from Yanan to the elevation of 2200 meters in Qinling mountain, the plants that grow with oak trees are diverse in types, which becomes the index for distinguishing oak forest. In the area, some of oak forests develop under hot and slightly dry climate, and others develop under hot and moist or cold and moist climate. The average annual temperature for which oak forest develops is between 7℃ and 14℃, andthe average annual rainfall is between 550 mm and 1000 mm, which shows that oak forest may develop both during glacial and during interglacial period. For this reason, distinguishing different oak forests is important for studying Quaternary climate. Sporo-pollen analysis for surface earth indicates that when the pollen content of the oak tree is 10 % or so, oak forest can be determined to be existence, and distinguishing different oak forests is possible on the basis of the sporo-pollen assemblage.
基金
地矿部八.五重点基础项目
关键词
秦岭
黄土区
栎林
发育
第四纪
古气候
Types of the oak forest
sporo-pollen assemblage
climate environment
