The Structure of Dark Coniferous Forests of Zyuratkul National Park

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Abstract

According to the available data, in Zyuratkul National Park there have been preserved remains of a highly productive relict spruce forest, which is one of the natural monuments and the largest reserve of natural genetic potential of Siberian spruce in the western subarea of the mountain forest part of Chelyabinsk Region. The paper aimed to study the current state of the pristine alpine spruce forests of the Southern Urals. Studying the structure of forest stands, we focused on the nature of inventory characteristics distribution depending on the type of wood. On this basis, we grouped statistical analysis data. The findings suggest that the structure of stand distribution by diameter is characterized by high variability of trunk diameter. Coefficient of diameter variation reaches up to 52.50 %. In most of the stands, the asymmetry of spruce distribution series by diameter is positive, reaching + 1.04. Kurtosis of spruce by diameter ranges from -0.22 to +1.52. The average height of spruce stands ranges from 14.9 to 23.6 m. Coefficient of height variation does not exceed 9.83 %. In all the types of forests we observed rather close relationships between the diameter and height of trees: coefficient of determination ranged from 0.47 to 0.94 %. The distribution of spruce trees in terms of height varies depending on the type of wood and is 92–126. The results of the approximation of the distributions of the number of trunks by thickness helped us identify the most appropriate equations for each of the forest types: - wood-sorrel spruce forest – log-normal distribution; - herb spruce forest – log-normal distribution; - wet valley spruce forest – log-normal distribution; - haircap-moss spruce forest – Weibull distribution. All the test areas are dominated by uneven-aged stands. The age ranges from 40 to 220 years with the mean age not exceeding the fluctuation interval. The asymmetry of spruce distribution series by age ranges from -1.08 to +0.86. The national park "Zyuratkul" in the coastal area of Lake Zyuratkul is marked by the formation of pure and mixed virgin spruce forests. The mixed ones include birch and larch, the share of which reaches up to 4 units at various species ratios. Alpine spruce forests are characterized by low productive capacity. The average yield class of these stands is IV.

Authors

P.I. Nazmiev, Teaching Assistant 

Affiliation

The Ural State Forest Engineering University

Keywords

structure, spruce, national park Zyuratkul, mountain forest, distribution, approximation.

References

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