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v − 1. Chromatic number. 2 if v > 1. Table of graphs and parameters. In graph theory, a tree is an undirected graph in which any two vertices are connected by exactly one path, or equivalently a connected acyclic undirected graph. [ 1] A forest is an undirected graph in which any two vertices are connected by at most one path, or equivalently ...
Old-growth forest. Old-growth European beech forest in Biogradska Gora National Park, Montenegro. Cool temperate rainforest in Tasmania, Australia. First growth or virgin forest near Mount Rainier, 1914. An old-growth forest[ a] (also referred to as primary forest) is a forest that has developed over a long period of time without disturbance.
Random forests or random decision forests is an ensemble learning method for classification, regression and other tasks that operates by constructing a multitude of decision trees at training time. For classification tasks, the output of the random forest is the class selected by most trees. For regression tasks, the mean or average prediction ...
Aokigahara ( 青木ヶ原, 'Blue Tree Meadow'), also known as the Sea of Trees (樹海, Jukai), is a forest on the northwestern flank of Mount Fuji on the island of Honshu in Japan, thriving on 30 square kilometres (12 sq mi) of hardened lava laid down by the last major eruption of Mount Fuji in 864 CE. [ 1] The western edge of Aokigahara ...
These forests are the most biodiverse and productive ecosystems in the world. Proportion and distribution of global forest area by climatic domain, 2020 [1] A forest is an ecosystem characterized by a dense community of trees. [2]
Forest ecology is the scientific study of the interrelated patterns, processes, flora, fauna and ecosystems in forests. [ 1] The management of forests is known as forestry, silviculture, and forest management. A forest ecosystem is a natural woodland unit consisting of all plants, animals, and micro-organisms ( Biotic components) in that area ...
The canopy at the Forest Research Institute Malaysia showing crown shyness. The canopy layer contains the majority of the largest trees, typically 30 metres (98 ft) to 45 metres (148 ft) tall. The densest areas of biodiversity are found in the forest canopy, a more or less continuous cover of foliage formed by adjacent treetops. The canopy, by ...
Extensive mountain ash (Eucalyptus regnans) forest with dense treeferns along many creeks. Prior to the 2009 Black Saturday bushfires, which burnt the majority of the reference area, this forest has not been burned since the 1700s, making many of the trees ~300 years old. Errinundra forests: Victoria