Evaluation of squared timber and log products in the Hyrcanian Forests of Iran

Abstract

ABSTRACT:The forests located in the northern areas of Iran are known as Hyrcanian Forests and are distributed across three provinces, namely Gilan, Maznadarn and Golestan. These provinces are situated in the north of Iran near the Caspian Sea. Timber products in the said forests during the last two decades were markedly different so that the total timber harvested in the first decade was 1.6 million m 3 on average, however, in the second decade it nearly amounted to 1 million m 3 . Two major timber products of Iran are studied and compared in this research, namely logs and squared timber. Squared timber products averaged 10.7% during the first decade, but they fell to 7.3% over the second decade. Apropos of log products, they reached 20.9% and 29.2% over the first and the second decade, respectively. Analyses of the data indicate the following converse linear equation between squared timber products and log products during the 20 years of study: Y =-0.359X + 18.065 (Y = log products, X = squared timber, R 2 = 0.768).Accordingly, any increase in log products at a time caused the squared timber products to decrease at the same time.

Evaluation of the effects of AlkylPhenolic compounds on kinetic parameters in a moving bed biofilm reactor

“…In this study, the values of the saturation constant and maximum utilization rate for the Stover-Kincannon model were in the low scope of results in the other research (Table 3). Similar observations were reported by Hosseiny and Borghei [25] for synthetic wastewater. Increasing the concentrations of 4-NP and 4-t-OP when the influent COD was equal to 500 mg/L, decreased the values of U max and K B .…”

The influece of forest gaps on some properties of humus in a managed beech forest, northern Iran

“…Hyrcanian forests of Iran, just like other forests, have been logged under different silvicultural operations such as shelterwood and selection methods [23,27] that created different gap sizes within these forests. These forestlands are located in the northern part of Iran, also known as the Caspian forests and belong to the end of the third geological era [5]. So far, few studies have been conducted regarding the effect of gap size in hyrcanian beech forests, especially, its effects on soil properties.…”

A Comparison between Uneven-Aged Forest Stands from the Southern Carpathians and Those from the Banat Mountains

“…A forest station or biotope is a welldefined geographical area characterised by its relief, rock (or parental material elements), soil type, and climatic conditions. These factors all establish and determine the productivity of stands [22][23][24], as well as the forest growth globally [25,26]. Furthermore, studies have shown that precipitation and temperature are other major factors that influence forest growth [27,28].…”