scholarly journals Critical turning moment of hinoki (Chamaecyparis obtusa (Siebold et Zucc.) Endl. ) with exposed root system near the tree trunk

2018 ◽  
Vol 44 (1) ◽  
pp. 123-126
Author(s):  
SHIMADA Hiromasa
Keyword(s):  
Root System ◽  
Chamaecyparis Obtusa ◽  
Tree Trunk ◽  
Exposed Root

scholarly journals THE DISTRIBUTION OF WINDFALL RELIEF FORMS WITHIN THE TERRITORY OF UKRAINE

2018 ◽  
pp. 53-59
Author(s):  
Y. Filonenko
Keyword(s):  
Root System ◽  
Root Canal ◽  
Field Research ◽  
Woody Vegetation ◽  
Tree Trunk ◽  
Mature Trees ◽  
Morphometric Features ◽  
The Subject ◽  
Strong Winds ◽  
Forest Lands

There are rather ubiquitous relief forms on the Ukrainian territory, which are created by strong winds within the forest lands and other areas where woody vegetation is represented. This article analyzes peculiarities of the emergence of such windthrow relief forms as windthrow hills, hollows, microstrands, microcaves, percussive microcraters and root blocks. By size, they predominantly have a rank of nano- and microrelief while their surface is often complicated by picoforms of relief. According to the materials of our own field research in different regions of Ukraine and based on the analysis of available publications on the subject, morphological and morphometric features as well as the density of the location of such relief forms within the territories with domination of woody vegetation were described. On the grounds of the field research, it can be concluded that hollows, hills (“earth hills’) and microstrands are the most widespread windthrow relief forms. The mechanism of their formation can be described in the following way: the root system of the tree breaks out under the influence of the wind, captures a certain amount of soil and forms a windthrow hollow on the place where the tree used to grow, a windthrow hill (“earth hill’) appears on the edge of the windthrow hollow from which the windthrow microstrand branches out. The dimensions of the windthrow hills and hollows depend mainly on the structure and condition of the root system and the composition of the soil. Meanwhile, the dimensions of microstrands depend on the length and diameter of the tree trunk and the height of the windthrow hill. As a result of falling of mature trees up to 1m deep hollows are often formed. Only occasionally, they have a rounded shape with a diameter of about 2m. In most cases, these relief forms are oval, 2-3 m in length and 1-2 m in width. Smaller windthrow forms occur when relatively small trees fall. The density of the windthrow hills, hollows and microstrands in the forest lands of different regions of Ukraine can range from several items to several dozen per 1 hectare. In some cases, during strong winds, windthrow “microcaves” (the result of incomplete root canal deformation) and percussive “microcraters” (the result of hitting the earth’s surface by broken trunks and large branches) are formed. On the slopes, as a result of the interaction of eolian activity, gravity, phytogenic factor and sometimes erosion, the formation of such a kind of windthrows as “root blocks” might take place. The study of such relief forms enables to assess the role and extent of the influence of the eolian factor and biota on the formation of morphosculptural characteristics of the surface of particular regions of Ukraine.

scholarly journals MODELING THE PROCESS OF REDUCING TREE STUMPS USING SELF-PROPELLED MACHINE BASED ON THE PARTICLE DYNAMICS METHOD

2020 ◽  
Vol 9 (4) ◽  
pp. 151-161
Author(s):  
Vladimir Pryadkin ◽  
Ivan Bartenev ◽  
Viktor Posmetev
Keyword(s):  
Mathematical Model ◽  
Root System ◽  
High Performance ◽  
Particle Dynamics ◽  
Simultaneous Removal ◽  
Vertical Force ◽  
Tree Trunk ◽  
Technological Operation ◽  
Tree Root System ◽  
Dynamics Method

The article presents an analysis of the tree dozer technologies. It is established that a separate method of grubbing out is most widespread due to the possibility of aggregation of various mounted and trailed tree dozer with wheeled and tracked tractors. Abroad, the most widespread method is simultaneous removal of the aboveground and underground parts of trees in the course of one technological operation. The main technical means of implementing direct stumping technology are self-propelled high-performance tree dozers of various capacities, and the process of tree stumping is carried out mainly with a vertically applied force. The purpose of the study was to develop a mathematical model of the process of tree stumping at a vertically applied effort based on the particle dynamics. The developed mathematical model enables to simulate soil and tree root system located in it, as well as the process of removing the tree root system, determine the vertical force applied to the tree trunk, at which feeding roots break and the main roots leave the soil. In the course of a numerical experiment, it has been found that when stumping garden trees with a diameter of 300 mm, the maximum vertical force reaches 74 kN. Due to the high physical adequacy and spatial resolution, the model enables to study the influence of the uprooting mechanism and the root system on the efficiency of stumping process.

Distribution of secoiridoid glycosides in the root system of the medicinal plant Gentiana lutea L. subsp. aurantiaca

2017 ◽  
Author(s):  
Ó González-López ◽  
S Mayo ◽  
Á Rodríguez-González ◽  
G Carro-Huerga ◽  
V Suárez Villanueva ◽  
...  
Keyword(s):  
Medicinal Plant ◽  
Root System ◽  
Gentiana Lutea ◽  
Secoiridoid Glycosides

EFFECTS OF DECP PROCESSING ON THE ROOT SYSTEM OF COTTON

2019 ◽  
Vol 2 (1) ◽  
pp. 33-37
Author(s):  
Komiljon Komilov ◽  
◽  
Dilfuzakhon Komilova
Keyword(s):  
Root System
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