• Türkçe
    • English
  • English 
    • Türkçe
    • English
  • Login
View Item 
  •   DSpace@Artvin
  • Fakülteler
  • Orman Fakültesi
  • Orman Mühendisliği Bölümü
  • Orman Mühendisliği Bölümü Koleksiyonu - Makaleler
  • View Item
  •   DSpace@Artvin
  • Fakülteler
  • Orman Fakültesi
  • Orman Mühendisliği Bölümü
  • Orman Mühendisliği Bölümü Koleksiyonu - Makaleler
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Modeling stem profile of caucasian fir and oriental spruce mixed stands in Turkey using nonlinear mixed-effects models

Thumbnail

View/Open

cakir_c.y.pdf (869.3Kb)

Access

info:eu-repo/semantics/closedAccess

Date

2018

Author

Çakır, C. Y.
Kahriman, Aydın

Metadata

Show full item record

Citation

Çakır, C. Y., & Kahriman, A. (2018). Modeling stem profile of caucasian fir and oriental spruce mixed stands in Turkey using nonlinear mixed-effects models. Applied Ecology and Environmental Research, 16(5), 6815-6833.

Abstract

The objective of this study is to develop segmented polynomial taper equations using the nonlinear mixed-effects modeling approach for Caucasian fir (Abies nordmanniana (Steven) Spach. subsp. nordmanniana) - Oriental spruce (Picea orientalis (L.) Link.) mixed stands in Artvin-Ardanuc region of Turkey. For this purpose, the data obtained from 213 felled sample trees in total, which are 107 fir and 106 spruce, were used. Jiang et al.'s (2005) stem profile model produced the best prediction results for both tree species. The R-adj(2), RMSE, (E) over bar, MAE, AIC and BIC values of the model were found as 98.7% and 98.3%, 1.700 and 1.814 cm, 0.143 and 0.167 cm, 1.179 and 1.269 cm, 4142.2 and 3951.7, 4148.5 and 3957.8 for fir and spruce, respectively. Based on AIC, BIC and -2LnL criteria, the model including random-effects in two parameters (b(3) and b(4)) were the best for both tree species. This mixed-effects model with two random parameters showed homogeneous residual variance and autocorrelation was almost removed. Mixed-effects models provided much better fits than their fixed model counterparts for both species. In addition, among 12 different calibration choices, the best results were obtained with the choice involving the measurement of five diameters that divide the sample tree measurements into two equal parts for fir and of four diameters that bottom of the sample tree for spruce.

Source

Applied Ecology and Environmental Research

Volume

16

Issue

5

URI

https://hdl.handle.net/11494/2787

Collections

  • Orman Mühendisliği Bölümü Koleksiyonu - Makaleler [290]
  • WoS İndeksli Yayınlar Koleksiyonu [685]



DSpace software copyright © 2002-2015  DuraSpace
Contact Us | Send Feedback
Theme by 
@mire NV
 

 




| Policy | Guide | Contact |
Advanced Search

sherpa/romeo

Browse

All of DSpaceCommunities & CollectionsBy Issue DateAuthorsInstitution AuthorORCIDTitlesSubjectsTypeLanguageDepartmentCategoryPublisherAccess TypeThis CollectionBy Issue DateAuthorsInstitution AuthorORCIDTitlesSubjectsTypeLanguageDepartmentCategoryPublisherAccess Type

My Account

LoginRegister

Statistics

View Google Analytics Statistics

DSpace software copyright © 2002-2015  DuraSpace
Contact Us | Send Feedback
Theme by 
@mire NV
 

 


|| Policy || Guide || Library || Artvin Çoruh University || OAI-PMH ||

Artvin Çoruh University, Artvin, Turkey
If you find any errors in content, please contact:

Creative Commons License
Artvin Çoruh University Institutional Repository is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 Unported License..

DSpace@Artvin:


DSpace 6.2

tarafından İdeal DSpace hizmetleri çerçevesinde özelleştirilerek kurulmuştur.