منابع مشابه
Road effect on diameter growth of trees in Caspian forests of Iran
Forest roads are the most important elements of forestry projects, the management, supervision, care, and only access way to the forest for mechanized harvesting and using other services of forests. The aim of this study was to compare the current annual increment of basal area in different distances from the road in northern forests of Iran. For this purpose, 50 plots were established in 5 dis...
متن کاملEstimating Height and Diameter Growth of Some Street Trees in Urban Green Spaces
Estimating urban trees growth, especially tree height is very important in urban landscape management. The aim of the study was to predict of tree height base on tree diameter. To achieve this goal, 921 trees from five species were measured in five areas of Mashhad city in 2014. The evaluated trees were ash tree (Fraxinus species), plane tree (Platanus hybrida), white mulberry (Morus alba), ail...
متن کاملIntegral trees of diameter 4
An integral tree is a tree whose adjacency matrix has only integer eigenvalues. While most previous work by other authors has been focused either on the very restricted case of balanced trees or on finding trees with diameter as large as possible, we study integral trees of diameter 4. In particular, we characterize all diameter 4 integral trees of the form T (m1, t1) • T (m2, t2). In addition ...
متن کاملMinimum Restricted Diameter Spanning Trees
Let G = (V,E) be a requirements graph. Let d = (dij)i,j=1 be a length metric. For a tree T denote by dT (i, j) the distance between i and j in T (the length according to d of the unique i − j path in T ). The restricted diameter of T , DT , is the maximum distance in T between pair of vertices with requirement between them. The minimum restricted diameter spanning tree problem is to find a span...
متن کاملNew reals: Can live with them, can live without them
Judah and Shelah [3] proved that countable support iterations of proper forcings preserve the ω-bounding property (see 2.2 here). In his book Proper and Improper Forcing [8, XVIII §3] Shelah gave several cases of general preservation theorems for proper countable support iterations (the proofs tend to be hard to digest, though). In this paper we deal with “Case A”. A simplified version of this ...
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ژورنال
عنوان ژورنال: Forestry
سال: 2006
ISSN: 0015-752X,1464-3626
DOI: 10.1093/forestry/cpl047