Forestry Engineering Journal Forestry Engineering Journal Лесотехнический журнал 2222-7962 72809 10.34220/issn.2222-7962/2023.3/4 htuueh Природопользование Nature Management Природопользование Simple asymmetry indicators tested in natural even-aged Scots pine (Pinus sylvestris L.) stands in Bulgaria Простые показатели асимметрии, использованные при исследовании естественных одновозрастных насаждений сосны обыкновенной (Pinus sylvestris L.) в Болгарии Петрин Румен Димитров Petrin Rumen Dimitrov lesn4eja2014@gmail.com 27 12 2023 27 12 2023 13 3 41 55 18 05 2023 13 11 2023 http://lestehjournal.ru/en/journal/2023/no-3-51/simple-asymmetry-indicators-tested-natural-even-aged-scots-pine-pinus

На основе 101 пробной площади в древостоях сосны обыкновенной (Pinus sylvestris L.) с возрастным диапазоном от 25 до 130 лет исследована асимметрия распределений деревьев по диаметру. На основании ретроспективного анализа предложены простые в использовании и подходящие для научных исследований строения лесных насаждений показатели – индекс асимметрии и показатель асимметрии. Предложенные показатели находятся в тесной корреляции друг с другом и могут считаться эквивалентными. Известный в более ранних публикациях специализированный показатель асимметрии – так называемый нулевой натуральный показатель, имеет с ними более слабую корреляцию. Предложенный индекс асимметрии диаметрального распределения обнаруживает обратную корреляцию с индексом крутизны кривых высот. Показатели могут применяться и пригодны для сравнительных исследований лесных дендроценозов по диаметру и высоте.

Based on 101 sample plots laid in Scots pine forest dendrocenoses aged 72 as an average with fulness around and over 0.7 has the structure in thickness, more exactly – the asymmetry of the distribution of tree numbers according to thickness, been investigated. Based on a retrospective analysis theoretically proved new indices have been introduced for finding and investigating this asymmetry, as well as a new indicator of asymmetry. The results obtained show that: a). The indices of asymmetry and the indicator of asymmetry, which proceeds from the indices, are in a close correlation (R2 = 0.93; 0.94) with the coefficients of asymmetry and are suitable for generalised comparative studies. b). The currently used generalised indicator of asymmetry – the zero natural indicator has a weaker correlation with the coefficient of asymmetry as compared with the correlation between the index of asymmetry and the indicator of asymmetry. c). The comparison between the indices of asymmetry for thickness structure and the indices of steepness for height structure has revealed a common trend as to inversely proportional change in these two kinds of indices and their correlation is R = 0.26. The general conclusion is that the indices and indicators of asymmetry are completely suitable and effective for generalised comparative studies such as, for example, the comparison between the structures in thickness and height of forest dendrocenoses.

 лесная биометрия диаметральные распределения Pinus sylvestris L. кривые высот асимметрия крутизна forest biometry diametric distributions Pinus sylvestris L. skewness height curves steepness

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