Structure of young growth of pine in various ecotopes of the Trans-Urals region
https://doi.org/10.21266/2079-4304.2021.234.53-64
Abstract
The results of study of spatial and age structure of pine on slash-cutover and cutover of young growth of pine of cowberry-shrub pine forest of the Trans-Urals region are considered. It has been shown that the undergrowth of pine on slash-cutover in comparison with cutting differs by a significantly smaller diameter at the middle of the trunk height, but differs by a significantly higher growth rate in height. The relative height of the undergrowth on the slash-cutover was 31.5–37.3% higher than that of the undergrowth on the cutover. This is due to the significantly higher density of undergrowth on slash-cutover compared to cutover. It has been established that most of the resumption as pine on both slash-cutover and cutover was concentrated in the areas adjacent to three sides of the forest. With a decrease in sources of insemination (adjoining two sides of the forest), the density of undergrowth decreased markedly. In turn, in open areas on slash-cutover and cutover, the number of undergrowth was the smallest. The young growth of pine is characterized by a regular (random) with a transition to a scattered (uniform) type of placement on the slash-cutovers. In cutovers, the main placement type is group. On slash-cutovers, the main part of the trees belonged to the resumption, which appeared for 2–3 years after fires and subsequent felling. The resumption, which appeared both for the next year and for 4–5 years after the removal of the woodland, was insignificant. For 6-year after the fire and felling, the resumption completely ceased. On cutovers, the main part of the trees belonged to the resumption, which appeared for 4–5 years after felling. However, although to a much lesser extent, the resumption of pine on the cutovers, took place in subsequent years. The pattern of change in the age structure of undergrowth for cut-offs is well approximated by the polynomial equation of the 4th order, and on the cut-offs of the 5th order.
About the Author
M. V. Ermakova
Institute Botanic Garden UB RAS
Russian Federation
Russian Federation
ERMAKOVA Maria V. – DSc (Agriculture), Senior Research Scientist
620144. 8 Marta str. 202a. Ekaterinburg
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For citations:
Ermakova M.V. Structure of young growth of pine in various ecotopes of the Trans-Urals region. Izvestia Sankt-Peterburgskoj lesotehniceskoj akademii. 2021;(234):53-64. (In Russ.) https://doi.org/10.21266/2079-4304.2021.234.53-64
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