Yield dynamics of introduced Siberian cedar pine crops in the Vologda oblast

The identification of yield dynamics of Siberian cedar pine in the conditions of introduction is useful for assessing the prospects of its introduction into local conditions and identifying high-yielding individuals. The paper presents the results of a study of the dynamics of seed bearing of Siberian cedar pine by year, as well as the individual variability of this indicator and correlative signs that allow the selection of high-yielding individuals. The research was carried out in the Chagrin cedar grove of the Vologda Oblast. In this plantation, the harvest of cones and seeds formed over a period of 11 years was recorded. In the absence of individual years without crop formation, which indicates the favorable climatic conditions of the area of introduction, the uneven formation of cones and seeds by the years of crop generation was revealed. The selection of model trees made it possible to identify instances of seed-bearing trees distinguished by a sufficiently high yield of cones and seeds. The average number of cones formed by maternal producers is most affected by the factor of individual variability. The year of crop generation also has an impact on the formation of cones in the crowns of trees, but noticeably lower. The effect of individual variability on the mass of the resulting seeds is somewhat less pronounced. Individual parameters of crown habitus are associated with reproductive ability. The width of the crown, unlike its length, is not related to yield. The most valuable correlative feature of seed productivity is the crown shape coefficient. The number of cones formed on trees and the weight of seeds depend significantly on the crown coefficient, i. e. on the ratio of its width to its length. When choosing seed trees for the collection of seeds necessary for the creation of high-yielding introduced crops and for the selection of plus trees, it is necessary to use such individuals of the crown shape coefficient, which is less than one.

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