Veikko Hintikka

Germination ecology of Galeopsis bifida (Lamiaceae) as a pioneer species in forest succesion.

Hintikka V. (1987). Germination ecology of Galeopsis bifida (Lamiaceae) as a pioneer species in forest succesion. Silva Fennica vol. 21 no. 3 article id 5320. https://doi.org/10.14214/sf.a15477

Abstract

The occurrence of Caleopsis bifida on clear-cut and burned forest soil and its disappearance in 4–6 years after disturbance is attributed to its germination ecology. Initially the seeds are dormant 96–100% and remain dormant in nylon gaze bags in different types of forest humus layers at least 10 years. Dormancy is released in laboratory (1) by treatment of 100 ppm aqueous solution of GA₃, (2) by heating the dormant seeds to 40–55°C for 1–5 h, and (3) by 1% KNO₃ solution. It is concluded that conditions in clear-cut and burned areas favour germination of seeds in regard to temperature and content of nitrates in contrast to humus of closed vegetation where the seeds remain dormant.

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Keywords
prescribed burning; Galeopsis bifida; germination ecology; pioneer species; forest succession; release of seed dormancy; clear-cut area

Published in 1987

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Available at https://doi.org/10.14214/sf.a15477 | Download PDF