ABSTRACT- To study the effect of tree roots on increasing water infiltration in soil and also to determine and assess the coefficients of different infiltration models, some infiltration tests were performed in three tree plantation areas in Badjgah, Fars province with different soil textures (clay loam for pear plantation, sandy loam for grape plantation, loamy sand for pine trees). In each pl...

Comparing trees with regard to their topology is in itself an interesting theoretical problem in computer science, and furthermore researchers working in the interdisciplinary field of computational biology need tools to compare phylogenetic trees, i.e. trees that describe the relation of species according to evolutionary history. Different methods and different information can result in differ...

We present some new results on a well known distance measure between evolutionary trees. The trees we consider are free 3-trees having n leaves labeled 0; :::;n ? 1 (representing species), and n ? 2 internal nodes of degree 3. The distance between two trees is the minimum number of nearest neighbour interchange (NNI) operations required to transform one into the other. First, we improve an uppe...

The effects of initial spacing layout on some allometric characteristics of 12-year-old Quercus castaneifolia trees grown in Central Mazandaran, north of Iran were examined. Trees were planted in 5 different layouts (1?1, 1.5?1.5, 2?2.5, 2?3 and 4?4 m). Tree height, diameter at breast height, natural pruning height and the survival of trees were recorded in each sample plot. Tree basal area and...

Geometric trees can be formalized as unordered combinatorial trees whose edges are endowed with geometric information. Examples are skeleta of shapes from images; anatomical tree-structures such as blood vessels; or phylogenetic trees. An inter-tree distance measure is a basic prerequisite for many pattern recognition and machine learning methods to work on anatomical, phylogenetic or skeletal ...

The goal of this paper is to study the similarity between sequences using a distance between the context trees associated to the sequences. These trees are defined in the framework of Sparse Probabilistic Suffix Trees (SPST), and can be estimated using the SPST algorithm. We implement the Phyl-SPST package to compute the distance between the sparse context trees estimated with the SPST algorith...

We define, analyze, and give efficient algorithms for two kinds of distance measures for rooted and unrooted phylogenies. For rooted trees, our measures are based on the topologies the input trees induce on triplets; that is, on three-element subsets of the set of species. For unrooted trees, the measures are based on quartets (four-element subsets). Triplet and quartet-based distances provide ...

Merge trees are topological descriptors of scalar functions. They record how the subsets of the domain where the function value does not exceed a given threshold are connected. We define a distance between merge trees, called an interleaving distance, and prove the stability of these trees, with respect to this distance, to perturbations of the functions that define them. We show that the inter...

In order to conduct a statistical analysis on a given set of phylogenetic gene trees, we often use a distance measure between two trees. In a statistical distance-based method to analyze discordance between gene trees, it is a key to decide “biological meaningful” and “statistically well-distributed” distance between trees. Thus, in this paper, we study the distributions of the three tree dista...