Models for estimating crown projection area from stump diameter for Tectona grandis Linn. f. in the tropical rainforests of Nigeria

Onyekachi CHUKWU, (Nnamdi Azikiwe University, Department of Forestry and Wildlife, Awka, Nigeria)
Jacinta Ukamaka EZENWENYI (Nnamdi Azikiwe University, Department of Forestry and Wildlife, Awka, Nigeria)
FORESTIST
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Yıl: 2021 Cilt: 71 Sayı: 1 Sayfa Aralığı: 25 - 30 Metin Dili: İngilizce DOI: 10.5152/forestist.2020.20017 İndeks Tarihi: 10-11-2021

Models for estimating crown projection area from stump diameter for Tectona grandis Linn. f. in the tropical rainforests of Nigeria

Öz:
The estimation of growth variables for a cleared tree is crucial in forest management. Most importantly, growth variable estimation for cleared trees allows for the conviction of illegal loggers in judicial proceedings and biomass estimation. Hence, the present study developed empirical models that are capable of precisely estimating the crown projection area (CPA) of trees from tree’s stump diameter (Ds) to serve as a crucial tool for evaluating tree loss and as descriptive evidence to inform the litigation process. The data for this study were gathered from 36 randomly laid 25 m×25 m temporal sample plots within six stand ages of Tectona grandis within a Nigerian reserved tropical rainforest. Least squares method was used to fit six regression models, namely simple linear, power, single logarithmic, growth, reciprocal, and square functions. The power model estimated CPA from Ds most appropriately by employing the lowest values of the root mean square error (8.42 m2), Akaike information criterion (6514.13), and Bayesian information criterion (6524.79). Furthermore, t-test result yielded a non-significant (p=0.431) difference between the observed and predicted CPA utilizing the power model. Hence, the power model was recommended for the conversion of counted stumps into harvested trees’ CPAs.
Anahtar Kelime:

Nijerya'nın tropikal yağmur ormanlarında Tectona grandis Linn ağacı tepe tacı izdüşüm alanının kütük çapı ile tahmin modelleri

Öz:
Bir ağaç için büyüme değişkenlerinin tahmini orman yönetiminde çok önemlidir. Ağaç büyüme değişkenleri için en önemli tahmin ağaçlar için büyüme değişken tahmini olup, bu tahmin biyokütle hesaplamalarında yasadışı odun üreticilerinin varlığının ispatlanmasına yardımcı olabilir. Bu nedenle, bu çalışma ile, odun üretimi kaybının belirlenmesi için önemli bir araç oluşturmak ve yasa dışı odun üreticileriyle ilgili, hukuki sürecin bilgilendirilebilmesi amacıyla açıklayıcı bir kanıt oluşturmak için ağaçların kütük çapından (Ds) ağaçların tepe tacı izdüşüm alanını (CPA) tam olarak tahmin edebilen ampirik modeller geliştirilmeye çalışılmıştır. Bu çalışma için gerekli veriler, Nijerya’da bir tropik yağmur ormanı içinde Tectona grandis ağacının bulunduğu altı farklı meşçere yaşına sahip, rastgele seçilmiş 25 m × 25 m ölçülerindeki 36 adet örnekleme alanından toplanmıştır. En küçük kareler yöntemi, basit doğrusal, güç, tek logaritmik, büyüme, karşılıklı ve kare fonksiyonları olmak üzere toplam altı regresyon modeline uyacak şekilde kullanılmıştır. Güç modeli, kök ortalama kareleri hatasının (8,42 m2), Akaike bilgi kriteri (6514,13) ve Bayes çıkarımı kriterinin (6524,79) en düşük değerleri kullanılarak kütük çaplarından (Ds), tepe tacı izdüşüm alanı (CPA) en uygun şekilde tahmin edilmeye çalışılmıştır. Ayrıca, t-testi sonucu, güç modeli kullanılarak gözlemlenen ve tahmin edilen tepe tacı izdüşüm alanı (CPA) arasında anlamlı olmayan (p=0,431) bir fark verdiği görülmüştür. Bu nedenle, izinsiz kesilmiş ağaçlara ait kütüklerin sayısıyla, hasat edilen ağaçların tepe tacı izdüşüm (CPA) alanlarına dönüştürülmesi için güç modeli önerilmiştir.
Anahtar Kelime:

Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık
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APA CHUKWU O, EZENWENYI J (2021). Models for estimating crown projection area from stump diameter for Tectona grandis Linn. f. in the tropical rainforests of Nigeria. , 25 - 30. 10.5152/forestist.2020.20017
Chicago CHUKWU ONYEKACHI,EZENWENYI Jacinta Ukamaka Models for estimating crown projection area from stump diameter for Tectona grandis Linn. f. in the tropical rainforests of Nigeria. (2021): 25 - 30. 10.5152/forestist.2020.20017
MLA CHUKWU ONYEKACHI,EZENWENYI Jacinta Ukamaka Models for estimating crown projection area from stump diameter for Tectona grandis Linn. f. in the tropical rainforests of Nigeria. , 2021, ss.25 - 30. 10.5152/forestist.2020.20017
AMA CHUKWU O,EZENWENYI J Models for estimating crown projection area from stump diameter for Tectona grandis Linn. f. in the tropical rainforests of Nigeria. . 2021; 25 - 30. 10.5152/forestist.2020.20017
Vancouver CHUKWU O,EZENWENYI J Models for estimating crown projection area from stump diameter for Tectona grandis Linn. f. in the tropical rainforests of Nigeria. . 2021; 25 - 30. 10.5152/forestist.2020.20017
IEEE CHUKWU O,EZENWENYI J "Models for estimating crown projection area from stump diameter for Tectona grandis Linn. f. in the tropical rainforests of Nigeria." , ss.25 - 30, 2021. 10.5152/forestist.2020.20017
ISNAD CHUKWU, ONYEKACHI - EZENWENYI, Jacinta Ukamaka. "Models for estimating crown projection area from stump diameter for Tectona grandis Linn. f. in the tropical rainforests of Nigeria". (2021), 25-30. https://doi.org/10.5152/forestist.2020.20017
APA CHUKWU O, EZENWENYI J (2021). Models for estimating crown projection area from stump diameter for Tectona grandis Linn. f. in the tropical rainforests of Nigeria. FORESTIST, 71(1), 25 - 30. 10.5152/forestist.2020.20017
Chicago CHUKWU ONYEKACHI,EZENWENYI Jacinta Ukamaka Models for estimating crown projection area from stump diameter for Tectona grandis Linn. f. in the tropical rainforests of Nigeria. FORESTIST 71, no.1 (2021): 25 - 30. 10.5152/forestist.2020.20017
MLA CHUKWU ONYEKACHI,EZENWENYI Jacinta Ukamaka Models for estimating crown projection area from stump diameter for Tectona grandis Linn. f. in the tropical rainforests of Nigeria. FORESTIST, vol.71, no.1, 2021, ss.25 - 30. 10.5152/forestist.2020.20017
AMA CHUKWU O,EZENWENYI J Models for estimating crown projection area from stump diameter for Tectona grandis Linn. f. in the tropical rainforests of Nigeria. FORESTIST. 2021; 71(1): 25 - 30. 10.5152/forestist.2020.20017
Vancouver CHUKWU O,EZENWENYI J Models for estimating crown projection area from stump diameter for Tectona grandis Linn. f. in the tropical rainforests of Nigeria. FORESTIST. 2021; 71(1): 25 - 30. 10.5152/forestist.2020.20017
IEEE CHUKWU O,EZENWENYI J "Models for estimating crown projection area from stump diameter for Tectona grandis Linn. f. in the tropical rainforests of Nigeria." FORESTIST, 71, ss.25 - 30, 2021. 10.5152/forestist.2020.20017
ISNAD CHUKWU, ONYEKACHI - EZENWENYI, Jacinta Ukamaka. "Models for estimating crown projection area from stump diameter for Tectona grandis Linn. f. in the tropical rainforests of Nigeria". FORESTIST 71/1 (2021), 25-30. https://doi.org/10.5152/forestist.2020.20017
Sayfa Oluşturulma Tarihi
25-03-2024 17:4

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