Лесоведение Изменчивость линейного прироста сосны обыкновенной...

Резюме. В работе представлены результаты анализа реакции линейных при-ростов сосны обыкновенной (Pinus sylvestris L.) в посадках и под пологом леса на воздействие метеорологических факторов. Для осуществления процедуры срав-нения оценивалась степень сходства ходов роста лесокультур и естественного возобновления данной породы деревьев. Исследования проводились на двух эко-полигонах, расположенных на территории Никольского лесничества (Пензенская область) в лесокультурах и в естественных древостоях. Обнаружены как сходные тенденции, так и случаи несходства откликов на климатические сигналы у лесо-культур и у сосны естественного возобновления. Таким образом, древостои даже в рамках одной территории могут демонстрировать неоднородность тенденций хода роста. Такие факторы, как происхождение семенного материала и локаль-ные условия произрастания каждого отдельного дерева, могут иметь значитель-ное влияние на ход роста, перекрывающее общие закономерности развития подроста сосны обыкновенной на определенном экополигоне.Ключевые слова. Линейный прирост, воздействие климатических факто-ров, Pinus sylvestris, лесокультура, естественное возобновление леса, Пензен-ская область. Summary. The issue considers the analysis of Scots pine (Pinus sylvestris L.) linear increment response to climatic factors impact in forestation and under canopy. In order to fulfill the comparison procedure the forestation and natural stands growth course INFLUENCE OF CLIMATIC FACTORS ON SCOTS PINE

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The relationship between the degree of moisture content of the territory and the nature of precipitation with linear growth of Scots pine ( Pinus sylvestris L.) was investigated on the area of the Kerzhensky Reserve located in the Nizhny Novgorod region. The main positive effect on the linear growth of Scots pine was exerted by heavy convective showers in the spring and early summer period, when the most intensive growth of trees was observed, with the exception of swampy biotopes, where the plants experienced water stress. The same negative impact on the linear growth of Scots pine was exerted by stratiform precipitation in all studied biotopes. Thus, an increase in the moisture content of the territory caused by the observed climatic changes will be positive only for pine stands of dry biotopes and can lead to degradation of moist and fresh pine forest ecosystems, especially with an increase in the amount of stratiform atmospheric precipitation.

Background: Lapland pine (Pinus sylvestris ssp. lapponica Fr. ex Hartm) is the geographical and climatic ecotype and subspecies of Scots pine. It is widespread in the north of Eurasia. Height growth is interconnected with both climatic parameters and the state of the habitat of pine trees. Methods: Long-term data on height growth indices of Lapland pine (var. nana Pallas (1784)), growing in various humid biogeocenoses of three specially protected natural territories of the North European part of Russia were studied. Also sixteen basic climatic parameters averaged over the growth period of the examined trees were calculated for these regions. The comparison of the values of both different climatic parameters and the height growth of pine stands of various biogeocenoses was made by the method of cluster analysis. Results: It was established that climatic parameters such as the mean daily average temperature in January and the amount of precipitation in the spring and early summer periods had a primary influence on the cluster similarity of the height growth of Lapland pine in the North European Russia. The proximity of soil and biocenotic conditions also influenced the similarity of height growth indices of Lapland pine, but had a lower rank within the two main clusters, distinguished by climatic values. Conclusion: Our studies showed that it is possible to identify the rank influence of the most significant climatic factors and soil-biocenotic conditions on the height growth of the geographical ecotype Lapland pine subspecies with the cluster analysis.