Polycyclism and phenological variability in the common oak (Quercus robur L.)

Archives of Biological Sciences

关键词: Quercus robur L.;    summer flowering;    phenological traits;    polycyclism;   

DOI  :  10.2298/ABS1201097B

来源: DOAJ

【 摘 要 】

Polycyclism is the ability for a plant to produce several flushes in the samegrowing season. The rare phenomenon of common oak (Quercus robur L.) summerflowering is proof of complex polycyclism. Common oak summer flowering andthe unusual transformation of inflorescences were the starting point for thisstudy of the phenological variability of common oak trees in identical siteconditions. This paper presents comparative research of leaf flushing,flowering, and leaf fall phenophases in a common oak with summer floweringand a control tree in which this phenomenon was not observed. Both treesdisplayed frequent polycyclism (polyphase formation of annual shoots duringthe growing season), but with different intensities depending on the treesand the years. Compared to the control tree, the tree with summer floweringwas characterized by a later onset of leaf-flush phenophase and leaf fallphenophase and a longer retention of the leaves in the crown.

【 授权许可】

Unknown