A Windthrow-risk Estimation for Coniferous Trees

A method of windthrow-risk estimation for young coniferous treesis proposed in this paper. This estimation is deduced from stembending theory. Fourteen pairs, each containing one dominant and one suppressedtree, were measured m a 15-year-old Scots pine thicket. Totallength of needled branches and stem diameter in the middle ofinter-whorl sections were measured for each whorl of each tree. The data were used to evaluate and compare growth strategy riskfor dominant and overtopped trees in the thicket. The strategieswere found to be qualitatively different. The suppressed treegrowth strategy was dependent on that of the dominant tree.Certain indices of ‘shelter effect’ for suppressedtree were also found.     

EFFECT OF COPPER SMELTING AIR POLLUTION ON THE MITES (ACARI) ASSOCIATED WITH YOUNG SCOTS PINE FORESTS POLLUTED BY A COPPER SMELTING WORKS AT GŁOGÓW,POLAND. II. SOIL MITES

Water, Air, &; Soil Pollution - The soil mites were investigated in the areas covered with dead needles in young Scots pine forests (plant association Leucobryo-Pinetum), polluted by a copper...