The Influence of the Decay Core on Efficiency of Aspen Forest Stands of Different Forms

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Abstract

Despite rich and various research materials in biology and ecology of aspen by the questions of its biological efficiency in connection with its biomorphological variety and defeat by the decay core is less attended by researches. The purpose of this work is studying of aspen forest stands efficiency in different age and different forms in connection with defeat by a false aspen tinder fungus of Phellinus tremulae (Bondartsev) of Bondartsev and P.N.Borisov. Research problems are: to study the linear extent of rough bark of different aspen forms; to reveal the connection between the extent of rough bark and decay core and an output of business wood; to define a wood stock, the general phytomass and the deposited carbon of different aspen forms in connection with defeat by decay core. In the studied forest stands the average linear extent of rough jointed bark at healthy and struck with a decay core trees of a “grey bark” aspen exceeds a similar indicator at “grey-green” and at “green bark” forms. Average linear extent of rough bark gradually increases in process of age increase of forest stands. The predicted and actual output of business wood tends to increase in process of movement from “grey bark” to a “green bark” form. The exit of business wood remains approximately identical and doesn’t depend on increase in extend of round bark of all an aspen. Such regularity is observed in all age classes. The greatest predicted and actual output of business wood is noted at a “green bark” form of an aspen – on the average on three age classes of 42,1% and 19,4% respectively. Essential influence by a decay core on the general phytomass and stock of the deposited carbon in the surveyed aspen forest stands of different forms wasn`t revealed. Conclusions: linear extent of rough, large and jointed bark at not struck with a decay core of trees of all studied aspen forms is more, than at the struck; the greatest extent of rough bark is noted at a grey bark form (3,5 m), the smallest – at a green bark form (2,6 m), such regularity is noted both for healthy, and for the trees of all aspen forms, struck with decay; in process of age increase of forest stands the extent of rough bark increases at all aspen forms; with increase an extent of rough bark the increase in linear extent by a decay core at all aspen forms is noted; defeat of aspen forest stands by decay core leads to noticeable decrease (by more than 2 times) of an output of business wood that is characteristic for all aspen forms, the smallest decrease in an output of business wood is noted at a “green bark” form of an aspen; defeat of aspen forest stands by decay core leads to insignificant decrease of the general phytomass and the deposited carbon.

Authors

• B.P. Churakov, Doctor of Biology, Professor
• I.T. Zamaldinov, Postgraduate Student
• R.A. Churakov, Student
  
  Ulyanovsk State University,
  L.Tolstogo, 42, Ulyanovsk, 432017, Russia;
  e-mail: churakovbp@yandex.ru

Affiliation

Keywords

References

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