Abstract
One of the most wildly spread wood species within the territory of Zabaykalsky Krai is Scots pine (Pinus sylvestris L.). Zabaykalsky Krai has a great length both from North to South (about 1000 km) and from West to East (about 800 km). This is responsible for a variety of soil and climatic conditions of growth of this wood species. There are two forest site zones (forest-steppe and Southern Siberia mountain zones) and four forest regions (Zabaykalsky forest-steppe, Baikal mountain-forest, Zabaykalsky mountain-permafrost and Zabaykalsky mountain-forest regions) within the territory of Zabaykalsky Krai according to the List of Forest Site Zones of the Russian Federation and the List of Forest Regions of the Russian Federation. It is necessary to know the long-term average values and limits of variability of seed quality indicators for the forest site zones and forest regions of the region in order to completely and adequately assess the effect of external factors on the population level of forest communities. So far, specific data have not been published for the considered region providing in relation to forest site zoning. The research purpose was to determine the long-term average values and limits of variability of weight of 1000 pcs of seeds, germinative energy and germinability for 2 forest site zones and 4 forest regions of the Krai, as well as for the Krai as a whole. These data can serve as a standard for rate setting of sowing seeds and growing high-quality planting material in forest nurseries for the forest site zone and forest region. One of the available methods for obtaining realistic data on pine forests reproduction in the region is a look back analysis of the materials of the Center for Forest Protection of Zabaykalsky Krai for the period from 1970 to 2016. As a result of the analysis, it was found that the average weight data of 1000 pcs of seeds, germinative energy and germinability for 2 forest site zones and 4 forest regions of the Krai change from North to South and from West to East. They increase in the direction from North to South: weight of 1000 pcs of seeds – by 25.3 %, germinative energy – by 16.5 %, and germinability – by 14.9 %. They decrease in the direction from West to East: weight of 1000 pcs of seeds – by 3.2 %, germinative energy – by 1.3 %, and germinability – by 0.9 %. The average weight of 1000 pcs of seeds for the Southern Siberia mountain zone was 6.0 g, for the forest-steppe zone – 7.5 g; the average values of germinative energy and germinability – 82.8 and 85.9 %, 88.7 and 91.7 %, respectively. All in all for Zabaykalsky Krai, the average weight of 1000 pcs of seeds corresponds to 6.5 g, germinative energy – 85.7 %, and germinability – 88.8 %.For citation: Pak L.N. Variability of Seed Quality Indicators of Pinus sylvestris L. within the Territory of Zabaykalsky Krai. Lesnoy Zhurnal [Russian Forestry Journal], 2019, no. 6, pp. 262–269. DOI: 10.17238/issn0536-1036.2019.6.262
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