INFLUENCE OF PRECOMMERCIAL THINNING ON GROWTH PARAMETERS IN Fraxinus angustifolia Vahl. PLANTATIONS

Year 2021, Volume: 5 Issue: 2, 339 - 351, 31.10.2021

Deniz Güney , Fahrettin Atar , İbrahim Turna , Ali Bayraktar , Alkan Gunlu

https://doi.org/10.32328/turkjforsci.883791

Cited By: 2

Abstract

The aim of this study is to reveal the effects of two different precommercial thinnings on diameter at breast height, basal area and volume increments in narrow-leafed ash (Fraxinus angustifolia Vahl.) plantations established in Sinop, Turkey. Two different precommercial thinnings were applied in the sample plots selected from narrow-leafed ash plantation, and in the first precommercial thinning (I1), the ash individuals grown as a result of planting were left in the field and measured. Naturally grown ash individuals in the next process, on the other hand, were cut and removed from the field, and the distance established by planting in this way (approximately 2 x 2 m) was tried to be maintained. In the second precommercial thinning (I2), the ash individuals grown naturally after planting were left in the field and measured together with the ash individuals grown with planting. Release cuttings at sample plots started in 2004 and the first measurement was carried out this year. Then, at the end of the 2007 growth period, the diameters at breast height of the trees were obtained and evaluations were made depending on the three-year increment results. As a result of the analysis of covariance for diameter at breast height, basal area and volume increments for three years (2004-2007), it was revealed that there were statistically significant differences between the treatments at 99% confidence level. It was determined that the three-year diameter at breast height increments of I1 and I2 treatments in the sample plots were 1.51 cm and 0.65 cm, respectively. Regarding the basal area increment, it was determined that increments of 10.31 m2ha-1 in the I1 treatment and 3.36 m2ha-1 in the I2 treatment were found. In terms of total volume increment, I1 treatment with an increment value of 93.01 m3ha-1 had a much higher increment value compared to the I2 treatment (24.27 m3ha-1). In the study, it has been revealed that removing the individuals naturally grown in the planting area in the next process and providing again 2 x 2 m distance between the trees has a significant effect on both the increase in the values of diameter at breast height increment and the values of the total basal area and volume increments per hectare.

Keywords

Ash, Increment, Basal area, Volume

Fraxinus angustifolia Vahl. PLANTASYONLARINDA BÜYÜME PARAMETRELERİ ÜZERİNE SIKLIK BAKIMININ ETKİSİ

Abstract

Bu çalışmada, Sinop yöresinde tesis edilen dar yapraklı dişbudak plantasyonlarında iki farklı sıklık bakımı müdahalesinin çap, göğüs yüzeyi ve hacim artımı üzerindeki etkilerinin ortaya koyulması amaçlanmıştır. Dar yapraklı dişbudak plantasyonundan seçilen deneme alanlarında iki farklı sıklık bakımı müdahalesi uygulanmıştır. İlk sıklık bakımı müdahalesinde (İ1), dikimle gelen dişbudak bireyleri alanda bırakılmış ve ölçülmüştür. Sonradan doğal olarak gelen dişbudak bireyleri ise kesilerek alandan uzaklaştırılmış ve bu şekilde dikimle kurulan aralık mesafe (yaklaşık 2x2 m) korunmaya çalışılmıştır. İkinci sıklık bakımı müdahalesinde (İ2), dikimden sonra doğal olarak gelen dişbudak bireyleri alanda bırakılmış ve dikimle gelen dişbudaklarla birlikte ölçülmüştür. Deneme alanlarında ayıklama müdahalelerine 2004 yılında başlanmış olup ilk ölçüm bu yılda gerçekleştirilmiştir. Daha sonra 2007 yılı gelişme dönemi sonunda ağaçların çap değerleri elde edilerek, üç yıllık artım sonuçlarına bağlı olarak değerlendirmeler yapılmıştır. Üç yıllık (2004-2007 yılı) çap, göğüs yüzeyi ve hacim artımına ilişkin kovaryans analizi sonucunda işlemler arasında %99 güven düzeyinde istatistiksel olarak anlamlı farklılıklar olduğu ortaya koyulmuştur. Deneme alanlarında İ1 ve İ2 işlemlerinin üç yıllık çap artım değerlerinin sırasıyla 1,51 cm ve 0,65 cm olduğu belirlenmiştir. Göğüs yüzeyi artımına ilişkin olarak İ1 işleminde 10,31 m2ha-1, İ2 işleminde ise 3,36 m2ha-1 değerinde bir artımın meydana geldiği tespit edilmiştir. Toplam hacim artımı bakımından da İ1 işlemi 93,01 m3ha-1 artım değeri ile İ2 işlemine (24,27 m3ha-1) göre oldukça yüksek bir artım değerine sahip olmuştur. Yapılan çalışmada dikim alanına sonradan doğal yolla gelen bireylerin alandan uzaklaştırılarak ve ağaçlar arasında 2 x 2 m dikim aralık mesafesinin tekrardan sağlanmasının, gerek çapı artımı, gerekse hektardaki toplam göğüs yüzeyi ve hacim artımı değerlerinin artması yönünde önemli etkiye sahip olduğu ortaya koyulmuştur.

Keywords

Dişbudak, Artım, Göğüs yüzeyi, Hacim

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