FRUCTIFICATION AND FORM DIVERSITY OF PETIOLATE OAK (QUERCUS ROBUR L.) OF THE NATURAL AND ARTIFICIAL SOUTH EAST OAK WOODS OF UKRAINE
Journal Title: Вісник Одеського національного університету. Біологія - Year 2017, Vol 22, Issue 2
Abstract
Introduction. In recent decades, degradation and mass drying of oak forests to a greater or lesser degree have been observed in many European countries. Popula tions of Q. robur in the Donetsk region are on the southern border of natural distribu tion, in which drying of oak forests caused by a lack of moisture, pests and diseases, excessive recreational load and nonobservance of the rules of silvicultural care is clearly expressed. First and foremost, this unsatisfactory resumption of oak forests is due to the shortage in them of high quality acorns, which require effiient selection. Purpose. To analyze the variability of acorns according to the morphometric fea tures, determine fructifiation of oaks, level of harvest of oaks and variety of shape of the Q. robur acorns, which grow on the southern border of the range of natural distribution in the Donetsk region. Material and Methods. The material for research was acorns of Q. robur, taken from seven populations. The variability of the morphometric characteristics of acorns was carried out according to the recommendations by V.V. Kucherevsky. Evaluation of flwering and fructifiation of oaks was performed on a six point Kapper scale. The level of harvest of oaks was determined on the basis of the Ratz scale of hardwood productivity. Results and conclusions. The level of variability of the morphological parameters of the acorns in the region under study varies between 8-16 %, the level of variability of acorns by weight is 3045 %. According to the fructifiation of oaks in the inves tigated region it has been revealed: two populations have abundant fructifiation, in 2 populations fructifiation is good and in 3 populations – satisfactory. Interharvest period amounted to 23 years in the Donetsk region. In the stands of Q. robur in the Donetsk region, acorns of typical shape and medium size predominate. The closer Q. robur stands grow to the south, the greater the occurrence of long fruited and wide rounded forms of acorns of the oaks is. The better harvest and largest morpho metric parameters of oak acorns were in populations that have grown in flodplain
Authors and Affiliations
А. А. Slepykh, I. Korshikov
Keywords
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- EP ID EP322766
- DOI 10.18524/2077-1746.2017.2(41).113768
- Views 88
- Downloads 0
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