نتایج جستجو برای: unmanaged compartment

تعداد نتایج: 31432  

Journal: :تحقیقات جنگل و صنوبر ایران 0
عیسی انیسی کارشناس ارشد جنگل داری، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران هادی کیادلیری استادیار، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران رضا اخوان استادیار پژوهش، موسسه تحقیقات جنگلها و مراتع کشور ساسان بابایی کفاکی استادیار، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران

this study was performed in order to consider the effect of management plans on forest, through comparison between qualitative and quantitative characteristics of managed and unmanaged forests. compartment no. 149 from shourab district (52.8 ha) and compartment no. 218 from jamand district (68.7 ha) were selected as managed and unmanaged forests, respectively and were inventoried using a system...

   Biomass measurement is important in terms of ecological and economical evaluation of the structure and conditions of habitat and can provide an estimate for carbon sequestration in different organs of tree. In order to assess the amount of biomass in harvested and unmanaged Beech stands, two compartments (511 and 514) of Safaroodchr('39')s forest  were selected. A plot of 6.25 hectare from e...

Journal: :Ecological applications : a publication of the Ecological Society of America 2018
April M Melvin Gerardo Celis Jill F Johnstone A David McGuire Helene Genet Edward A G Schuur T Scott Rupp Michelle C Mack

Increasing wildfire activity in Alaska's boreal forests has led to greater fuel-reduction management. Management has been implemented to reduce wildfire spread, but the ecological impacts of these practices are poorly known. We quantified the effects of hand-thinning and shearblading on above- and belowground stand characteristics, plant species composition, carbon (C) and nitrogen (N) pools, a...

2012
Li Lu Michael L. Scott

Multiversion STM systems allow a transaction to read old values of a recently updated object, after which the transaction may serialize before transactions that committed earlier in physical time. This ability to “commit in the past” is particularly appealing for long-running read-only transactions, which may otherwise starve in many STM systems, because short-running peers modify data out from...

Journal: :annals of military and health science research 0
علی کربلایی خانی a karbalai khani assistant professor, army university of medical sciences, dep't of general surgery, 501 hospital, tehran, iran علیرضا بابایی ar babaei (*corresponding author) assistant professor, army university of medical sciences, dep't of plastic & reconstructive surgery, 501 hospital, tehran, iran. tel: 021-88632967 حمزه شاه علی h shahali medical researcher, army university of medical sciences, tehran, iran

crush injury of an extremity occurs when a limb is compressed between two hard surfaces, to the point where vascular supply is impaired and vulnerable tissues undergo necrosis. most commonly, limbs are crushed during auto versus pedestrian accidents, motor vehicle crashes, and industrial accidents. however, during natural disasters such as earthquakes, buildings collapse, landslides, mine cave-...

Journal: :Conservation biology : the journal of the Society for Conservation Biology 2010
Yoan Paillet Laurent Bergès Joakim Hjältén Péter Odor Catherine Avon Markus Bernhardt-Römermann Rienk-Jan Bijlsma Luc De Bruyn Marc Fuhr Ulf Grandin Robert Kanka Lars Lundin Sandra Luque Tibor Magura Silvia Matesanz Ilona Mészáros M-Teresa Sebastià Wolfgang Schmidt Tibor Standovár Béla Tóthmérész Anneli Uotila Fernando Valladares Kai Vellak Risto Virtanen

Past and present pressures on forest resources have led to a drastic decrease in the surface area of unmanaged forests in Europe. Changes in forest structure, composition, and dynamics inevitably lead to changes in the biodiversity of forest-dwelling species. The possible biodiversity gains and losses due to forest management (i.e., anthropogenic pressures related to direct forest resource use)...

2012
Joachim Krug Michael Koehl Dierk Kownatzki

UNLABELLED BACKGROUND Unmanaged or old-growth forests are of paramount importance for carbon sequestration and thus for the mitigation of climate change among further implications, e.g. biodiversity aspects. Still, the importance of those forests for climate change mitigation compared to managed forests is under controversial debate. We evaluate the adequacy of referring to CO2 flux measurem...

Journal: :The Science of the total environment 2018
Hanna Hajdukiewicz Bartłomiej Wyżga Antoni Amirowicz Paweł Oglęcki Artur Radecki-Pawlik Joanna Zawiejska Paweł Mikuś

Assessment of the ecological status of rivers is key to monitoring the achievement of the environmental goal of the EU Water Framework Directive and the success of restoration projects. In summer of 2009 and 2010, repeated assessments of physical habitat conditions and of fish and benthic invertebrate communities were performed at low-flow conditions in 10 unmanaged and 10 channelized cross-sec...

2013
Olivier VIDAL

In asserting that the number of firms reporting small profits is abnormally high, thus suggesting that earnings management has taken place, accounting researchers assume that the distribution of reported earnings should be smooth for unmanaged earnings. This has never in fact been demonstrated. This article seeks to confirm this assumption through a laboratory experiment, and also sets out to i...

2008
R. Gene Stout

Stochastic optimization identifies the asset allocation that minimizes the probability of exhausting the retirement portfolio, thereby minimizing risk, from unmanaged (constant) and optimally managed withdrawals over the retirement life span. Optimal equity compositions and minimized probabilities of prematurely exhausting the portfolio increase with higher withdrawal rates and earlier retireme...

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