نتایج جستجو برای: cutting trees

تعداد نتایج: 129549  

Journal: :Journal of environmental management 2014
Alexandro B Leverkus Juan Lorite Francisco B Navarro Enrique P Sánchez-Cañete Jorge Castro

An intense debate exists on the effects of post-fire salvage logging on plant community regeneration, but scant data are available derived from experimental studies. We analyzed the effects of salvage logging on plant community regeneration in terms of species richness, diversity, cover, and composition by experimentally managing a burnt forest on a Mediterranean mountain (Sierra Nevada, S Spai...

ژورنال: علوم آب و خاک 2017
باغستانی, ناصر, دیبایی, شایسته, شریعتمداری, حسین, میرمحمدی میبدی, سیدعلی محمد,

The adaptability of Haloxylon appilium to adverse environmental conditions and especially its capability for an appropriate establishment in saline and desert soils has introduced this plant as a suitable means for biological methods to stabilize sand dunes, control erosion and prevent desertification in arid regions. In order to evaluate the ecophysiological characteristics of Haloxylon appili...

Journal: :Forest Ecology and Management 2023

Competition for land use between forestry and reindeer husbandry has been debated in northern Finland, particularly due to the possible adverse effects of on availability forage resources reindeer. In an attempt achieve a better reconciliation these uses, as well promote multiple forest use, we studied 37 stand-, plot-, tree-level variables pendulous lichens (Alectoria sp., Bryoria sp. Usnea sp...

Journal: :Journal of Biology, Agriculture and Healthcare 2021

Moringa oleifera is native to northern India and planted in many parts of the world. In Ethiopia, little known about management silvicultural practices plant. The present study was conducted determine whether different cutting/pollarding heights affect yield growth at Arba Minch Zuriya Woreda, Southern Ethiopia from November 2016 September 2019. Two months old hardened twenty-five seedlings tre...

Adil Hussein Juaifer Mohammad Lotfi, Saeid Amini, Sayed Ali Sajjady,

In this study, turning operation of Monel K500 copper-nickel super-alloy was evaluated. Ceramic cutting tools with two different cutting noses (conventional and wiper) were utilized. At first, the experimental tests were designed by using central composite design method. After implementation of the tests, the statistical models for output data (surface roughness, cutting force, and flank wear) ...

 In the present study, an attempt has been made to experimentally investigate the effects of cutting parameters on cutting force in end milling of AISI 304 steel with solid carbide tools. Experiments were conducted based on four factors and five level central composite rotatable design. Mathematical model has been developed to predict the cutting forces in terms of cutting parameters such as he...

سید عطاءالله سیادت, , مانی مجدم, , قدرت ‌الله فتحی, , قربان نورمحمدی, ,

Effects of different levels of nitrogen fertilizer and cutting time of forage on grain and forage yield of barley (Hordeum vulgare L.) Karoon cultivar was studied during 1995-1996 at Ramin Agricultural Research and Educational Center, University of Shahid Chamran, Ahwas, by using a split plot design in randomized complete block with 4 replications. Main plots were assigned to five levels of N f...

ژورنال: علوم آب و خاک 2002
سید عطاءالله سیادت, , مانی مجدم, , قدرت ‌الله فتحی, , قربان نورمحمدی, ,

Effects of different levels of nitrogen fertilizer and cutting time of forage on grain and forage yield of barley (Hordeum vulgare L.) Karoon cultivar was studied during 1995-1996 at Ramin Agricultural Research and Educational Center, University of Shahid Chamran, Ahwas, by using a split plot design in randomized complete block with 4 replications. Main plots were assigned to five levels of N...

Journal: :bulletin of the iranian mathematical society 0
mehri javanian javanian mohammad q. vahidi asl vahidi-asl

in this paper, using generalized {polya} urn models we find the expected value of the size of a branch in recursive $k$-ary trees. we also find the expectation of the number of nodes of a given outdegree in a branch of such trees.

2000
James S. Meadows

Four thinning treatments were applied to a red oak-sweetgum (Quercus spp.-Liquidambar styraciha L.) stand on a minor streambottom site in west-central Alabama in 1994: (1) unthinned control; (2) light thinning to 70-75 percent residual stocking; (3) heavy thinning to 50-55 percent residual stocking; and (4) B-line thinning to desirable residual stocking for bottomland hardwoods, as recommended ...

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