Abstract Retention of habitat trees is a common biodiversity conservation practice in continuous cover forests temperate Europe. Commonly, living are selected on the basis their tree-related microhabitats (TreMs) such as cavities or crown deadwood. Owing to increasing frequency and intensity climate change-related disturbances, particular expected experience increased mortality rates. This may ...

Quantifying tree canopy cover is fundamental to applications in forestry and ecology, but estimates vary substantially depending on type of field measurement, imagery, or active sensing used. Our objective was improve stand-level from standard inventory measurements, using representative data collected across diverse forest plant association groups Oregon, USA. Canopy measured with line interce...

The eccentric connectivity index ξ is a distance–based molecular structure descriptor that was recently used for mathematical modeling of biological activities of diverse nature. We prove that the broom has maximum ξ among trees with a fixed maximum vertex degree, and characterize such trees with minimum ξ . In addition, we propose a simple linear algorithm for calculating ξ of trees.

Background and Purpose: Structure of crowns in forest stands is one of the main factors which determines growth and development of trees. Dynamic change occurs with the age of the stand due to silvicultural interventions or natural disturbances during which trees are removed from the stand. The aim of this article is to analyse the structure of the crown shape of pedunculate oak and common horn...

We study tree-automatic linear orders on regular tree languages. We first show that there is no tree-automatic scattered linear order, and in particular no well-order, on the set of all finite labeled trees. This also follows from results of Gurevich-Shelah [8] and Carayol-Löding [4]. We then show that a regular tree language admits a tree-automatic scattered linear order if and only if all tre...

We prove that a generalization of the edge dominating set problem, in which each edge e needs to be covered be times for all e ∈ E, admits a linear time 2-approximation for general unweighted graphs and that it can be solved optimally for weighted trees. We show how to solve it optimally in linear time for unweighted trees and for weighted trees in which be ∈ {0, 1} for all e ∈ E. Moreover, we ...

Crown profile models were developed for north, east, south, and west crown directions of dominant trees, intermediate trees, and suppressed trees in planted stands of Larix olgensis Henry in Northeast China. A total of 139 sample trees were randomly selected, and all branches of each tree were measured. A segmented power equation, segmented polynomial equation, modified Weibull equation, and Ko...

Shrub biomass estimation is valuable in assessing ecological health, soil, and water conservation capacity, carbon storage arid areas, where trees are scattered, shrubs usually dominant. Most shrub models derived from designed for trees, yet show significant differences morphology. However, current methods specifically still lacking. This study aimed to test various predictors’ performance esti...