Allelopatic impact of some dominants in bare cuttings of scotch pine forest under climate change

Abstract

The objectives of this research of the present study was to determine whether the plant allelopatic effect on Scotch pine (Pinus sylvestris L.) seed germination and seedlings development is enhanced or reduced depending on the climatic factors (temperature) to with they are subjected. A multifunctional laboratory experiment was designed in order to evaluate and to compare the ailelopatic activity ol the aqueous extracts produced from both ground parts and roots of dominants of first year clear-cuttings of pine forests (Vacciniosa) at different temperature regime. After the assessment of phytocenosis of selected clear-cuttings of pine forests, it was found that the dominating position has Pleurozium schreberi, Vaccinium vilis-idaon and Calluna vulgaris. During the experiment the impact of phytotoxicity of produced aqueous extracts was evaluated in dependence on plant species, plant part and different temperature regime. The aqueous extracts of dominants of 1 st year clear-cuttings of pine forests exerted stronger phytotoxicity on germination of Scotch pine seeds at 20 C/29°C than at 18/27°C temperature regime. The results conformed that the inhibitory effect for radicle growth of different plant and plant parts was strongest than for growth of hypocotyls at both 18/27 °C and 20°C/29°C temperature regime