Sergei V. ZALESOV, Anastasiya V.DANCHEVA, Sezgin AYAN, Alimzhan N. RACHIMZHANOV, Alimzhan N. RACHIMZHANOV, Medeu R. RAZHANOV, Opletaev S. ANTON

Silvicultural Efficiency of the Thinning Efficiency of Pinus sylvestrisL. Plantation in the Dry Subzone of Northern Kazakhstan Steppes

Aim of study:Thinning efficiency after 18 years of cuttingat theScots pine (Pinus sylvestrisL.)plantations,in the subzone of the dry grass steppe,were examined.Area of study:On 45-year-old Scots pine plantations on the territory of the state enterprise "ZhasylAimak"in Nur-Sultan cityin the Northern Kazakhstan.Material and methods:The plantations were established by high density planting (13,300 seedlings/ha) of 2-year old seedlings. The planting was carried out on forest-suitable soils. To assess the silvicultural efficiency of the thinning in the plantation, the coefficient of growth tension or a complex estimated figure (CEF)was used.Main results:The research confirm that Scots pine plantations can be establishedin the subzone of dry fescue feather-grass steppe(Festucavalesiaca-Stipetum capillataeSillinger 1930). The maximum silvicultural effect of thinning was achieved with three steps. Inthe 1ststep of the thinning of the forest,10-15 yearsoldtrees are cut down. Trees with over-developed crown are also cut down. The 2ndstep is made in 25-30 years with thinning intensity of 25% by stock. The 3rdstep is made in 40-50 years in a uniform way.Highlights:In the harsh climatic conditions of Northern Kazakhstansteppe, deciduous trees and shrubs begin to age and die much earlier than the long-lived Scots pine.

Kuzey Kazakistan Steplerinin Kuru Altzonlarındaki Sarıçam Plantasyonlarında Aralamanın Etkinliği

Çalışmanın amacı:Step vejetasyonunkuru-alt bölgesindekiSarıçam(Pinus sylvestrisL.) plantasyonlarındaaralamanın18 yıl sonraki etkinliğiincelenmiştir.Çalışma alanı:Kuzey Kazakistan'ın Nur-Sultan şehrindeki “Zhasyl Aimak" devlet işletmesi arazisinin45 yaşındaki sarıçam plantasyonları. Materyal ve yöntem:Plantasyon,yüksek yoğunlukta dikilen (13300 fidan/ha) 2 yaşlı fidanlar ile tesis edildi. Dikim,uygun orman toprakları üzerinde gerçekleştirildi. Aralamanın, plantasyondaki silvikültürel etkinliğini değerlendirmek için büyüme gerilim katsayısı veya karmaşık tahmini rakam kullanılmıştır (CEF)Temel sonuçlar:Araştırma sonuçları, Kuzey Kazakistan'ın kuru çayır bozkırlarının alt bölgesinde sarıçam plantasyonlarının oluşturulabileceğini teyid etmektedir. Aralamanınmaksimum silvikültürel etkisi üç aşamadaelde edilmiştir. Aralamanın 1.aşaması;aşırı tepe gelişimli ağaçlar ile 10-15 yıllık kuru-ölü ağaçların kesilmesidir. Aralamanın 2. adımı,25-30 yaşlarında servetin %25’nin çıkarılmasıdır.3. aşama ise 40-50 yaşlarında uniform bir şekilde yapılır. Önemli vurgular:Kuzey Kazakistan’ın sert iklim koşullarında; yaprak döken ağaçlar ve çalılar uzun ömürlü sarıçamdan çok daha erken yaşlanmaya ve ölmeye başlarlar.

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