Resin productivity of pine forest stands in the conditions of Ukraine

• Main Authors: Leonid Osadchuk, Liubov Kondratiuk
• Format: Article
• Language: English
• Published: Ukrainian National Forestry University 2018-05-01
• Series: Наукові праці Лісівничої академії наук України
• Subjects: Scots pine; climatype; variability of resin productivity
• Online Access: https://doi.org/10.15421/411803
• ISSN: 1991-606X; 2616-5015

Individual resin productivity of Scots pine (Pinus silvestris L.) should be considered as implementation of the hereditary program under the influence of external factors. Resin productivity of Scots pine was determined on the direct basis (by the method of micro wounds) in the plantations of pre-mature and mature stands, which grew in different geographical and ecological conditions of Ukraine. In the mature stands of Small Polissya the resin productivity fluctuated within 8.25 8.41 g / day, ripening 6, 42 6.71 g / day. In the conditions of the Kyiv Polissya this indicator, respectively, was 8.93 and 7.68 g / day. The most productive types of forests provide significantly higher resin productivity of pine climates, growing under certain conditions. Therefore, in favorable conditions for the Scots pine stands growth on the edge of Polissya and Forest Steppe (Small Polissya and South Polissya) on fresh fairly infertile and fertile site types, the Scots pine is characterized by high resin productivity. Pine fairly infertile sites were distinguished by the highest resin productivity (9.7 g / day), where favorable temperature and water conditions were observed during the summer season. The influence of regional climatic factors on the resin productivity is indicated by correlation dependences. The straight-line connection of strong and very strong tightness was found with the average annual air temperature (r=0.82) and the sum of the active temperatures above 10° C (r=0.82), a considerable connection exists with the maximum air temperature and the duration of solar irradiation. Feedback of measurable and significant tightness was detected with minimum air temperature (r=0.35), average annual precipitation (r=0.49) and snow cover duration (r=0.58), and height of the site above sea level (r=0.90). The main factors, which positively affects on the variability of Scots pine resin productivity, are the average annual and maximum air temperature, as well as SAT. Negative impact on resin productivity is detected by such climate indicators as minimum air temperature, average annual precipitation and duration of snow cover. The coefficient of variation in the determination of resin productivity in different regions of Ukraine varied from 26 to 58 %. Higher variability of resin productivity was established in the southern regions (Lower Dnieper climatype) more than 50%. Obviously, extreme growth conditions (high temperature and lack of moisture) significantly differentiate the resin productivity of Scots pine. Further development of forest tapping production should be based on economic, silvicultural and technological principles. It is necessary to strengthen economic methods of management of this type of forest management, develop standards for the productivity of pine stands and adapt them to modern requirements. It is necessary to use silvicultural and selection methods for creating and forming pine stands with increased resin productivity, taking into account the wide application of resins and their processing products, ecological safety and resource recovery. It is necessary to use sustainably the raw material base of coniferous trees, improve, develop and implement environmentally friendly methods of tapping and new principles of management in this field.