نتایج جستجو برای: forest road

تعداد نتایج: 175693  

Journal: :جنگل و فرآورده های چوب 0
حسن پوربابایی دانشگاه گیلان رامین نقدی دانشگاه گیلان مهدی حیدری دانشگاه ایلام مهدیه نوری دانشگاه گیلان

in order to evaluate the effects of forest road on regeneration and vegetation composition in district no. 2 shafaroud, a road was selected with the length of 400 m that the altitude, aspect, slope variations and species composition were similar. five transects in right and 5 transects in left side of road, were established as perpendicular. in each transect 5, 15, 25 and 35 m distances were de...

Journal: :Proceedings. Biological sciences 2014
Sadia E Ahmed Alexander C Lees Nárgila G Moura Toby A Gardner Jos Barlow Joice Ferreira Robert M Ewers

Road building can lead to significant deleterious impacts on biodiversity, varying from direct road-kill mortality and direct habitat loss associated with road construction, to more subtle indirect impacts from edge effects and fragmentation. However, little work has been done to evaluate the specific effects of road networks and biodiversity loss beyond the more generalized effects of habitat ...

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During the construction of road networks large area of forests and rangelands will be destroyed in the road path and its margins. This process causes massive amount of soil and rock move from its site and on adjacent lands will be accumulated, that causes increasing environmental degradation. One of the most important problems due to forest roads making is increasing of different erosion forms ...

2008
SUSAN G. W. LAURANCE

In the lowland tropical rain forest of central Amazonia, I investigated the responses of understory bird communities to forest edges bordering a narrow (<40 m width), unpaved road. From 3681 mist-net captures, bird abundance and composition were examined at three distances (10, 70, and 130 m) from forest edge. The degree to which regrowth vegetation along forest borders reduced edge effects was...

Journal: :journal of agricultural science and technology 2013
e. hayati e. abdi b. majnounian m. makhdom

in the last few years, public awareness has been on the increase about short- and long-term effects of forest roads construction on the environment. therefore, forest road managers have to be concerned about the negative impacts and mitigate them as much as possible. this research conducted multi-criteria analysis techniques in a useful way to define the effective criteria and propose a model f...

2007
J. M. Grace B. D. Clinton

The National Forest road system is the network that supports public recreation, which has become the primary use of the public lands. The pattern of use of National Forest roads for recreation has increased dramatically since the late 1940s and is expected to continue to increase beyond the rates observed today. However, research over the past 60 years clearly presents forest roads as a major s...

2014
Xiao-Hua Dai Jia-Sheng Xu Lu-Rong Cai

The effects of a forest road on Castanopsis carlesii (Hemsley) Hayata (Fagales: Fagaceae) seedlings and their leaf herbivory were investigated in a subtropical forest at Jiulianshan National Nature Reserve, Jiangxi, China. A total of 1124 seedlings, 33949 leaves, 468 leaf mines, and 205 leaf galls were found. Generally, individual numbers, tree heights, and leaf numbers of C. carlesii seedlings...

2000
J. A. Trofymow D. M Goodman A. J. Thomson

Contact Information Developing an online database of descriptions of ectomycorrhizae 1. Research Scientist, Canadian Forest Service, Natural Resources Canada, Pacific Forestry Centre, 506 Burnside Road West, Victoria, BC, V8Z 1M5. Email: [email protected] 2. Biologist, Canadian Forest Service, Natural Resources Canada, Pacific Forestry Centre, 506 Burnside Road West, Victoria, BC, V8Z 1...

2001
Bob Rummer

Management of bottomland hardwood sites requires adequate access to support forest operations. A study conducted in a bottomland forest in central Georgia has evaluated the effect of forest road design on sediment movement and water quality. Five years of measurement indicate that a conventional crowned road design is a net sir& for sediment, primarily due to settling in ditches. An alternative...

2007
Gerald GRUBER Johannes SCHOLZ Gerald Gruber Johannes Scholz

This paper focuses on an interdisciplinary approach using Geoinformation Science and Technology, Operations Research and Forest Science to overcome the limitations of the traditional forest road planning process. A pilot study shows that combining Geoinformation Science and Technology and Operations Research supports forest road planning. The first research objective solved in the project is th...

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