Assessment of the sanitary condition of birch stands in forest parks of the city of Tyumen (on the example of the Zatyumensky ecopark)

The  results   of  a  study of  the  state  of  birch  tree  stands of  the  «Zatyumensky» ecopark  are presented using  indicators of sanitary condition, relative  living  condition, relative  height and  a comprehensive assessment indicator. It is established that  according  to the indicators of sanitary and  relative   living   condition, birch  stands in  all  test  areas  are  characterized as  weakened. There is a general  pattern of increasing the  number of severely  weakened and  drying trees  and  decreasing the  number of healthy trees  with  an  increase  in  recreational impact. In  the  area  of active  visitation, the number of severely weakened and  dying  trees is 2-9 times  greater,  and  the number of healthy trees on average is 3-4 times less in comparison with the zones of moderate and weak visits. The number of dead trees decreases by 2-5 times  as the tree stand is removed  from the object of linear recreation. The analysis of the types of damage to birch tree trunks showed  that  the most common are mechanical damage to tree trunks and  the  presence  of fruit  bodies  on tree trunks. The  largest  number of trees  with  mechanical damage is noted in the area of active visitation – up to 14% of the total number of trees, which  is 4-8 times higher than the same indicator in the zone of moderate and weak visits.  The largest number of trees with fruit  bodies on the trunks is noted  in the area of weak  visits  – up to 7% of the total number of recorded trees. The  largest  number of trees with  fruit  bodies  on the trunks is noted  in the area of weak  visits  – up to 7% of the total number of recorded trees. In order to prevent  the degradation of birch plantations of the «Zatyumensky» ecopark and increase their sustainability, a number of forestry measures have been proposed, in particular, temporary fencing of forest areas that are in critical condition for the period of their restoration; carrying out landscape felling  in order to rejuvenate tree stands and  create recreationally attractive and sustainable landscapes of semi-open type, etc.

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