Influence of tree density on the results of evaluating families of plus trees in the progeny tests of Norway spruce

Based on the results of studies in test cultures of 30–40-year-old Norway spruce plus trees, data on the influence of plantation density on the efficiency of comparative evaluation of families of plus trees were obtained. The inverse dependence of stand density on the average trunk diameter of the plantation was observed. At the same time, the density of the plantation does not have a significant effect on the level of diameter dependence on the family affiliation of the tree and does not significantly affect the results of comparative assessment of the growth rate of families of plus-trees in the progeny tests. The joint effect of planting density and plant family affiliation on growth rate is statistically insignificant, which confirms the possibility of analyzing the effect of plant family affiliation and planting density on biometric indices separately, without taking into account their joint influence. The actual distribution of trunk diameter is significantly different from the classical normal distribution of the trait. The value of the index of reliability of differences between families decreases at the age of bowing and intensive competition of plantations, remaining, nevertheless, within the limits of preservation of reliable values. Further growth and development of plantations after the end of intensive processes of self-expiration of the plantation (beginning of the second age class) leads to a repeated increase in differences between families of plus-trees. The influence of genetic factors (tree family identity) has a statistically significant effect on the growth rate of Norway spruce trees from at least the beginning of the second age class (20 years for conifers) up to the age of final evaluation of plus-tree families in progeny tests (40 years).

1. Boev V.M., Borshchuk E.L., Ekimov A.K., Begun D.N. Rukovodstvo po obespecheniyu resheniya mediko-biologicheskih zadach s primeneniem programmy Statistica 10.0. [Guidelines for ensuring the solution of biomedical problems using the Statistica 10.0 program]. Orenburg: OAO «IPK «Yuhnyj Ural», 2014. 208 p. (In Russ.)

2. Bondarenko A.S., Zhigunov A.V. Comparative assessment of Norway spruce plus trees based on the analysis of the rank dynamics of their seed progeny in progeny tests. Izvestia Sankt-Peterburgskoj Lesotehniceskoj Akademii, 2023, iss. 243, pp. 68–85. (In Russ.)

3. Borovikov V.P. STATISTICA. Iskusstvo analiza dannyh na komp'yutere: Dlya professionalov. 2-e izd. [STATISTICA. The art of data analysis on a computer: For professionals. 2nd ed.] St. Petersburg: Piter, 2003. 688 p. (In Russ.)

4. Demidenko V.P., Tarakanov V.V. Comparative assessment of the growth intensity of 20-year old offspring of pinus plus trees in the Novosibirsk region. Forestry, 2008, no. 5, pp. 36–37. (In Russ.)

5. GOST R 50.1.037-2002. Prikladnaya statistika. Pravila proverki soglasiya opytnogo raspredeleniya s teoreticheskim. CHast' II. Neparametricheskie kriterii (GOST R 50.1.037-2002 Applied statistics. Rules for verifying the agreement of the experimental distribution with the theoretical one. Part II. Nonparametric criteria.). M.: Gosstandart of Russia, 2002. 66 p. (In Russ.)

6. Grzhibovskiy A.M. Analiz trekh i bolee nezavisimykh grupp kolichestvennykh dannykh [Analysis of three or more independent groups of quantitative data]. Human ecology, 2008, no. 3, pp. 50–58. (In Russ.)

7. Jansson G., Hansen J.K., Haapanen M., Kvaalen H., Steffenrem A. The genetic and economic gains from forest tree breeding programmes in Scandinavia and Finland. Scandinavian journal of forest research, 2017, vol. 32, no. 4, pp. 273–286.

8. Kobzar' A.I. Prikladnaya matematicheskaya statistika [Applied mathematical statistics]. Moscow: Fizmatlit, 2006. 468 p. (In Russ.)

9. Osnovnye polozheniya metodiki zakladki ispytatel’nykh kul’tur plyusovykh derev’ev osnovnykh lesoobrazuyushchikh porod [The main provisions of the methodology for foundation of progeny tests for the main forest tree species]. Voronezh: Izd-vo gazety «Kommuna», 1982. 18 p. (In Russ.)

10. Pravila lesovosstanovleniya (The reforestation rules): utv. prikazom Minprirody Rossii ot 29 dekabrya 2021g. No. 1024. (In Russ.)

11. Pravila sozdaniya i vydeleniya ob’yektov lesnogo semenovodstva (lesosemennykh plantaciy, postoyannykh lesosemennykh uchastkov i podobnykh ob’yektov) [Rules for the creation of forest seed production objects (seed orchards, permanent forest seed stands and others)]. Approved by Order of Ministry of Natural Resources and Ecology of the Russian Federation, 20.10.2015, No. 438, Moscow, 2016. 18 p. (In Russ.)

12. Raevskiy B.V., Shchurova M.L. Metodika selektsionno-geneticheskoy otsenki klonov sosny obyknovennoy na lesosemennykh plantatsiyakh [The Method For Breeding and genetic assessment of scotch pine clones at forest seed orchards]. Siberian forest journal, 2016, no. 5, pp. 91–98. (In Russ.)

13. Raevskiy B.V., Ignatenko R.V., Novichonok E.V., Prokopiuk V.M., Kuklina K.K. The Current State of Conifer Species Breeding and Seed Production. Lesnoy Zhurnal = Russian Forestry Journal, 2022, no. 6, pp. 9–37. (In Russ.)

14. Rogozin M.V. Potomstvo eli sibirskoy v ispytatel'nykh kul'turakh raznoy gustoty [The offspring of Picea sibirica in progeny test of different densities] Coniferous boreal zone, 2013, vol. 30, no. 1–2, pp. 112–115. (In Russ.)

15. Tarakanov V.V., Palenova M.M., Parkinа O.V., Rogovtsev R.V., Tretyakova R.A. Forest Selective Breeding in Russia: Achievements, Challenges, Priorities (Overview). Forestry information, 2021, no. 1, pp. 100–143. (In Russ.)