Results 21 to 30 of about 14,189,131 (148)

Parameter estimation of nonlinear growth models in forestry

Silva Fennica, 1999
Partial derivatives of the negative exponential, monomolecular, Mitcherlich, Gompertz, logistic, Chapman-Richards, von Bertalanffy, Weibull and the Richard’s nonlinear growth models are presented.
Fekedulegn, Desta, Mac Siurtain, Mairitin, Colbert, Jim   +2 more
doaj   +1 more source

Height-diameter model for natural black pine stands in Eğirdir region: Quantile regression approach

Turkish Journal of Forestry, 2022
Black pine (Pinus nigra JF Arnold.) is one of the most economically and ecologically important tree species in Turkey. In this context, reliable and accurate information about the current status, growth and yield characteristics of these forests is ...
Onur Alkan, Ramazan Ozçelik
doaj   +1 more source

Reconstructing leaf growth based on non-destructive digitizing and low-parametric shape evolution for plant modelling over a growth cycle

Silva Fennica, 2014
A simple and efficient photometric methodology is presented, covering all steps from field data acquisition to binarization and allowing for leaf contour modelling.
Henke, Michael, Huckemann, Stephan, Kurth, Winfried, Sloboda, Branislav   +3 more
doaj   +1 more source

Engelmann spruce site index models: a comparison of model functions and parameterizations.

PLoS ONE, 2015
Engelmann spruce (Picea engelmannii Parry ex Engelm.) is a high-elevation species found in western Canada and western USA. As this species becomes increasingly targeted for harvesting, better height growth information is required for good management of ...
Gordon Nigh
doaj   +1 more source

Verification of two- and three-parameter simple height-diameter models for birch in the European part of Russia

Journal of Forest Science, 2020
The accuracy of determining the height of trees is essential both in forestry and in scientific research. Height is usually determined using specific models, where it is a function of the diameter at breast height.
Aleksandr Lebedev, Valery Kuzmichev
doaj   +1 more source

EVALUATION OF SITE QUALITY AND MODELLING TREE PRODUCTIVITY BY LIDAR TECHNOLOGY IN SALT-AFFECTED OAK FOREST TERRITORY [PDF]

Natural Resources and Sustainable Development, 2019
Forest site quality evaluation is an important part of forest planning and forest management. A forest site is characterized by forest biomass, which is determined by elevation characteristics, soil type and climate.
Riczu Péter, Nagy Attila, Tamás János
doaj   +1 more source

Height–diameter modeling of tree species in boreal and mixed forests using a mixed-effects approach and stand-level variables

Forest Science and Technology
Forests are ecologically complex, and trees play a structural and functional role in ecosystem dynamics. Tree height–DBH (diameter at breast height) relationships serve as a key indicator of forest productivity, competition, and succession, fundamental ...
Jamshid Eslamdoust, Stan Vasiliauskas, Todd Little, Muhammad Waseem Ashiq   +3 more
doaj   +1 more source

Aging, Maturation and Growth of Sauropodomorph Dinosaurs as Deduced from Growth Curves Using Long Bone Histological Data: An Assessment of Methodological Constraints and Solutions. [PDF]

PLoS ONE, 2013
Information on aging, maturation, and growth is important for understanding life histories of organisms. In extinct dinosaurs, such information can be derived from the histological growth record preserved in the mid-shaft cortex of long bones.
Eva Maria Griebeler, Nicole Klein, P Martin Sander   +2 more
doaj   +1 more source

Predictors of Change in Severity of Self‐Injurious Behaviors in Preschool‐Aged Autistic Children

Autism Research, EarlyView.
ABSTRACT Self‐injurious behaviors (SIBs) affect up to 50% of autistic individuals and significantly impact quality of life and everyday functioning. Cross‐sectional studies link the presence of SIB to lower IQ, altered sensory responsivity, and poor emotion regulation, yet their effect on changes in SIB severity from early childhood to school age in ...
Joseph Boyle, Andrew Dakopolos, Olivia Surgent, Joshua K. Lee, Derek S. Andrews, Brianna Heath, Jason Smucny, Marjorie Solomon, Sally J. Rogers, Christine Wu Nordahl   +9 more
wiley   +1 more source

Perbandingan Model Pertumbuhan Mcdill-Amateis Dan Model Chapman-Richards Pada Pertumbuhan Tanaman Kedelai [PDF]

, 2016
Model pertumbuhan merupakan fungsi nonlinier yang berbentuk sigmoid (kurva menyerupai bentuk S). Fontes dkk. (2003) membandingkan model Lundqvist-Korf, McDill-Amateis, dan Chapman-Richards. Menurut Fontes dkk.
Pradnyani, NiluhPutuArni
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