Forest planted stands of red oak (Quercus rubra L.) with grey alder (Alnus incana (L.) Moench) on reclaimed lands in the Forest-Steppe
Journal Title: Лісівництво і агролісомеліорація - Year 2018, Vol 133, Issue
Abstract
Planted forest stands on reclaimed lands are established on a mixture of overburden grounds suitable for forests. In the dumped rocks, the humus and nitrogen contents are very low and in most cases, there is an insufficient supply of such macronutrients as potassium and phosphorus. In order to increase the fertility of the trophotope and intensify the growth of the main forest forming species, some ameliorative plants can be introduced into the forest species composition within a stand. Among wood species, Alnus incana (L.) Moench and Alnus glutinosa (L.) Gaertn. are mostly chosen. Materials and Methods In a permanent trial on forest reclamation, we studied the growth characteristics of planted red oak stands from I to III age classes with the participation of gray alder as ameliorative species. The permanent trial was located within the Kozachanske forestry, the Zvenigorodske Forest Economy. The changes in mensuration variables and the mutual influence of the tree species have been studied in pure and mixed (with grey alder) planted red oak stands during the entire period of their growth. The investigation of the growth and development of planted red oak stands with grey alder as well as calculation and analysis of forest mensuration indicators were carried out using commonly used methods in forestry and normative materials. Results At 8 years old, the average height of red oak in a mixed stand was 64 % higher compared to pure oak stand: 2.2 m against 1.4 m. The average total height increment was 46 cm against 34 cm. At 12 years old, red oak had V yield class in a pure oak stand and III yield class in a mixed one; it was Ia for gray alder. At 17 years old, in the pure stand, the oak had III yield class and in a mixture with the alder, Ia. In the 28 years, the yield class was I for pure oak stand and Ia for mixed one. At the age of 28, alder had I yield class but its preservation was 9.2 % since only the best alder trees were left. The others died being not able to compete for moisture with red oak. For each variant of the trial and each breed, the coefficients for the equations for the course of growth by mensuration variables of a stand have been determined. The age for the removal of gray alder from the stand due to its drying out and loss of ameliorative function has been defined. Conclusions The introduction of gray alder into the red oak plantations makes it possible to significantly improve their growth and to reduce the stand development phases, namely, to shorten the period for the planted stands to become closing, as well as promotes more rapid formation of the forest environment. The age limit to which it is possible not to cut off gray alder in red oak planted stands is 15–17 years. After this time a strong competition for moisture begins, which leads to almost complete alder mortality, to increase in the red oak mortality compared to the section where the alder rows were cut, and to a decrease in the growth rate of the stock volume of red oak compared with the section with the cutting of alder, and even with the control. 6 Figs, 3 Tables, 15 Refs. Key words: forest reclamation, forest planted stands, red oak, grey alder, reclamation species, mensuration characteristics.
Authors and Affiliations
P. Tarnopilsky
Keywords
Related Articles
- EP ID EP533352
- DOI 10.33220/1026-3365.133.2018.54
- Views 131
- Downloads 0
Growth and condition of pine plantations, created by the planting material grown using plant growth regulators
Peculiarities of diameter, height and condition dynamics of pine plantations created by planting material, which was grown using plant growth regulators (PGRs) were studied. Use of PGRs for Scots pine seeds treatment pr...
Typological structure and productivity of black poplar stands in different natural and climatic zones of the plain part of Ukraine
Over last decades, the climate change has caused changes in the habitats of plants. Between 2000 and 2010 in Ukraine, the area of poplar and aspen trees has been increased by 30 %. The area of black poplar (Populus nigra...
Illumination of the soil surface and development of the grass cover in fild protective belts of different species composition
The paper dwells on protective stands of different species composition. Condition of forest shelter belts in the area of Scientific Research Economy "Dokuchayevske" of Kharkiv National Agrarian University had been analyz...
Results of progeny tests of 25-year-old plus trees of English oak halfsibs in Khmelnitsk region
Analysis of results of progeny tests of 25-year-old plus trees of English oak halfsibs by growth intensity, stem quality and bark type is presented. Complex evaluation is suggested for evaluation of availability of plus...
Dynamics of radial growth in middle-aged pine stand after fire in Ukrainian Polissya
The problem of fires in Polissya forests is associated with the abnormal number of hot and dry days during some periods. To our knowledge, features of pine radial growth in stands after fires as an integral indicator of...