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Dynamics of the variability of tree height in growing stocks of scots pine pinus sylvestris l. norway spruce picea abies l. karst. and silver fir abies alba mill


Dynamics of the variability of tree height in growing stocks of scots pine pinus sylvestris l. norway spruce picea abies l. karst. and silver fir abies alba mill



Nauka za Gorata 28(2): 55-62



One hundred and eighty sample plots were used in characterizing the dynamics of tree height variability in Scots pine, Norway spruce and silver fir growing stocks. In even-aged stands of these species a great dependence of tree height variability on growing stock's age was found. This dependence has analytically been presented. The average coefficients of height variability, calculated for juvenile Scots pine (30 years old) ppeared to be two high (22.6%) diminishing at the age of 150 down to 9.6%. For Norway spruce of the same ages their values were 34.0 and 17.2% resp., yet for silver fir - 42.1 and 17.3%, resp. In young growing stocks (20-40 years) the lowest height for Scots pine was 53% of the average one, and the biggest one - 132% resp., with a difference between them of 79%. For growing stocks older than 80 years this difference amounted to an average of 62%. In young spruce stands (20-40 years) the lowest height was 44% (as an average) of the average one, and the biggest one - 137% resp., with a difference between them of 93%, yet for growing stocks older than 80 years it amounted to an average of 82%. These data were 50% and 151%, with differences of 101% and 72% resp. for silver fir stands. In case of mensuration of such growing stocks, therefore, these data should be used as a reference.

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