Chin J Plan Ecolo ›› 2008, Vol. 32 ›› Issue (4): 883-890.DOI: 10.3773/j.issn.1005-264x.2008.04.017

• Research Articles • Previous Articles     Next Articles


REN Jian-Yi; LIN Yue; YUE Ming*   

  1. Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, Northwest University, Xi’an 710069, China
  • Online:2008-07-30 Published:2008-07-30
  • Contact: YUE Ming

Abstract: Aims Betula albo-sinensis occurs in the middle to high elevations of Taibai Mountain, China where its forests have
regeneration barriers. We studied the germination and physiological characteristics of B. albo-sinensis seeds to investigate
natural regeneration.
Methods We observed 2 400 seeds of B. albo-sinensis without pericarp and recorded germination rates. We studied germination
rates under different photosynthetically active radiation (PAR) and photoperiod (high light: PAR = 464.7 μmol photons·m-2·s-1, 12 h·d–1; middle light: PAR = 233.8 μmol photons·m-2·s-1, 12 h·d–1; low light: PAR = 233.8 μmol photons·m-2·s-1,
0.5 h·d–1), different day/night temperatures (25/20 ℃, 20/15 ℃ and 15/10 ℃) and with and without pericarp. We also
recorded germination rates without light, under different culture media (soil and sand) and mulch (broad leaf, needle leaf
and mixed leaf) or covered with leaf (broad leaf and mixed leaf).
Important findings We found that 54.29% of the seed is full in the fully maturated ones. The optimum germination temperature
is 25/20 ℃, and few seeds germinated under 15/10 ℃. Germination rates under middle light were highest, and there was no
seed germination under no light. Shelling the pericarp could improve germination rates. Germination rates declined in the
groups covered with mulch, but there was no significant difference among culture media. We conclude that B. albo-sinensis
seed germination depends on natural disturbances in its natural environment.