Abstract
This research was done with the aim of comparing the durability of hand-planted and natural Zerbin species against white rot[1]. For this purpose, the effect of rainbow fungus [2] (white rot agent) on hand-planted and natural Zerbin wood was analyzed. A factorial design with random blocks was used for this study. The samples were prepared and tested according to B.S. 838:1961, DIN 52176 standards, and after 14 weeks of proximity to the fungus in question, mass reduction tests, parallel fiber compressive strength, and hardness were measured. The results showed that the percentage of mass reduction in Planted hand wood is more than natural wood, also comparing the parallel compressive strength of fibers, it was observed that planted hand wood shows more resistance than natural wood. But in the parallel compressive strength of natural zerbin fibers, the results were such that the inside of the wood showed more resistance than the outside of the wood. In the test of resistance to hardness between the two species, more resistance was observed in the natural wood than the hand-planted wood. Also, between the inner wood and the outer wood of natural Zerbin, the results were that the inner wood showed more resistance than the outer wood. Also, according to the classification table of natural durability of Fendlay [3], the outer wood of the plantation is placed in the medium durability group and its useful life is 10-15, and the natural outer wood is in the durable wood group and its useful life is 15-20, but the natural wood interior is placed in the very durable group and its useful life It is over 25 years old.
Key words: natural and hand-planted wood, natural durability, white rot, parallel fiber pressure, hardness
Chapter One
General
Part One: Introduction and Objective
Introduction:
Forest is a divine gift that has somehow met human needs since the past. In different times, people have looked at the forest with a different perspective according to their culture. At one time he used it as a shelter and for grazing animals or to prepare food and clothing, and at another time he started building a building by extracting wood, and what is obvious is that his exploitation was done unconsciously. The need for the forest is increasing every day with the advancement of science and technology as well as population growth, and this issue has become a crisis today, as it cannot meet this need. Therefore, accurate knowledge of wood structure is very important. Because as a result of this recognition, its correct use is revealed and its maximum use is made so that this renewable material which is produced at a high cost is not wasted and the tree cover of the forest areas is preserved. That people should think about producing more wood, which means planting and cultivating and exploiting the fast-growing species of trees. The importance of wood obtained from the forest in traditional and construction industries and uses, the need for high reliability of wooden structures and products, the possibility of predicting the allowable strengths of structures, economic savings in the construction of wooden products and structures has caused a lot of emphasis in the field of engineered wood use. And marni can be seen intermittently in Alborz mountains, Gorgan, Rudbar and Hasanabad Chalus regions. Due to the above reasons, the Zerbin species does not grow well in its habitats, but if suitable environmental conditions are provided, this species has a good growth and is even able to compete with many imported non-native conifer species; Therefore, it can be concluded that the development of forestry with sledgehammers is of special importance both in order to increase and develop the level of this species as much as possible and in terms of providing the wood needed by cellulose industries.
Wood is considered as a huge source of energy on the planet, which is not easy to decompose, but it is not difficult for fungi, and maybe after a few months, it can completely decompose it. Some of these fungi are saprophytic, which means they work on live trees and some are parasitic and work on dead trees and extracted wood.
Rainbow mushroom is a basidiomycete and a member of the Polyprasa family [4], which can be called one of the fungi that determine natural durability in laboratory conditions.
Purpose:
The drastic decrease in the area of ??forests on the one hand and the lack of wood resources on the other hand, has led to the thought of using hand-planted species as well as planting these trees, and this issue requires a complete and accurate knowledge of wood species so that by knowing the species, their characteristics and their resistances, the uses of each can be determined and wood waste can be prevented.