scholarly journals Effects of forest roads on species composition of trees regeneration in selection cutting management of high forests

Forestist ◽  
2020 ◽  
Vol 70 (2) ◽  
pp. 151-159
Author(s):  
Marzieh Zamani ◽  
◽  
Mehrdad Nikooy ◽  
Farzam Tavankar ◽  
◽  
...  
Keyword(s):  
Species Composition ◽  
Forest Roads ◽  
Selection Cutting ◽  
Cutting Management

scholarly journals Comparison of Fixed Diameter-Limit and Selection Cutting in Northern Conifers

2005 ◽  
Vol 22 (2) ◽  
pp. 77-84 ◽  
Author(s):  
Laura S. Kenefic ◽  
Paul E. Sendak ◽  
John C. Brissette
Keyword(s):  
Species Composition ◽  
Stem Density ◽  
Present Value ◽  
Short Term ◽  
Usda Forest Service ◽  
Stand Volume ◽  
Selection Cutting ◽  
History Of ◽  
Treatment Analysis

Abstract Diameter-limit cutting is a common type of harvest in which all merchantable trees above specific size thresholds are removed. Despite a long history of application, controlled experiments of these harvests are rare and the cumulative effects of repeated diameter-limit cuts are largely unknown. The Penobscot Experimental Forest in Maine is the location of a long-term USDA Forest Service experiment in which both fixed diameter-limit and selection cutting have been applied at 20-year intervals since the early 1950s. After three entries, present value of gross harvest revenue was greater in the fixed diameter-limit than selection treatments. However, sawtimber volume and growth, total and merchantable volume, regeneration stem density, and inventory value all were lower in the fixed diameter-limit than selection stands. Accumulated value (harvest plus residual) and species composition did not differ between treatments. Within-treatment analysis revealed desirable directional changes in cull percentage and species composition in the selection but not diameter-limit cut stands, suggesting trends that may result in greater future treatment disparity. These data confirm the degrading effects of fixed diameter-limit relative to selection cutting, and reveal that greater short-term value removals are offset by lower residual stand volume and value. North. J. Appl. For. 22(2):77–84.

scholarly journals Effects of Forest Roads on Herbaceous Species Composition (Case Study: Asalem Forest)

2017 ◽  
Vol 6 (1) ◽  
pp. 29-40
Author(s):  
H. Tarverdizadeh ◽  
M. Nikooy ◽  
H. Pourbabaei ◽  
R. Naghdi ◽  
◽  
...  
Keyword(s):  
Species Composition ◽  
Herbaceous Species ◽  
Forest Roads

scholarly journals Felling and skidding damage to residual trees following selection cutting in Caspian forests of Iran

2013 ◽  
Vol 59 (No. 5) ◽  
pp. 196-203 ◽  
Author(s):  
F. Tavankar ◽  
B. Majnounian ◽  
A.E. Bonyad
Keyword(s):  
Common Type ◽  
Major Objective ◽  
Selection Cutting ◽  
Logging Damage ◽  
Plot Sampling ◽  
Cutting Operation ◽  
Cutting Management ◽  
Residual Tree ◽  
Stand Damage ◽  
Type Of Injury

The felling and skidding damage to residual trees was investigated in a selectively cutting operation in the Caspian forest of Iran. The logging operation was performed by chainsaw and cable skidder. Prelogging, after felling and skidding operations residual tree injuries (species, DBH and damage) were inventoried by systematic plot sampling. Two types of tree damage were observed: destroyed and injured. In this study felling operations mainly injured trees whereas skidding was the main cause of destruction. The percentage of destroyed and injured residual trees by felling operations was 1.4% and 3.4%, whereas the percentage of destroyed and injured residual trees by skid­ding operations was 5.2% and 11.1%. About 87% of destroyed trees were found in the DBH class smaller than 22.5 cm. Maple and Alder were the most damaged trees among the other trees species. Damage to the lower bole and wood damaged intensity were the most common type of injury. To reduce the stand damage, skid trails should be planned before felling and felling directions should be predetermined. In the selection cutting management, limiting logging damage to residual trees must therefore remain a major objective.    

SPECIES COMPOSITION AND TOXICOLOGICAL CHARACTERISTICS OF FUNGI OF THE GENUS Aspergillus ISOLATED FROM COARSE FODDERS

2017 ◽  
Vol 52 (6) ◽  
pp. 1279-1286
Author(s):  
G.P. Kononenko ◽  
◽  
E.A. Piryazeva ◽  
E.V. Zotova ◽  
A.A. Burkin ◽  
...  
Keyword(s):  
Species Composition
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