نتایج جستجو برای: number of snags

تعداد نتایج: 21177911  

2011
Renata Pernar

Features of Spatial Snag Distribution in a Beech-Fir Forest With the participation of about 65% in the total growing stock of conifers, silver fir is the most important andthe best represented conifer species in Croatia. The increasing share of sanitary felling in the annual felling plansdemands that special attention be paid to the health status of fir forests and the quantity of unpla...

Journal: :Ecological processes 2021

Abstract Background The epidemic Dendroctonus rufipennis (spruce beetle) outbreak in the subalpine forests of Colorado Plateau 1990s killed most larger Picea engelmannii (Engelmann spruce) trees. One quarter century later, snags are beginning to fall, transitioning deadwood (down woody debris) where they may influence fire behavior, regeneration, and habitat structure. Methods We tracked all fa...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تبریز 1390

learning a second or foreign language requires the manipulation of four main skills, namely, listening, reading, speaking, and writing which lead to effective communication. it is obvious that vocabulary is an indispensible part of any communication, so without a vocabulary, no meaningful communication can take place and meaningful communication relies heavily on vocabulary. one fundamental fac...

2017
Julián Caviedes José Tomás Ibarra

Forest attributes and their abundances define the stand structural complexity available as habitat for faunal biodiversity; however, intensive anthropogenic disturbances have the potential to degrade and simplify forest stands. In this paper we develop an index of stand structural complexity and show how anthropogenic disturbances, namely fire, logging, livestock, and their combined presence, a...

Journal: :Forest Ecology and Management 2022

Standing dead trees, or snags, serve myriad functions in natural forests, but are often scarce forests managed for timber production. Variable retention (VR), the of live and trees through harvest, has been adopted globally as a less intensive form regeneration harvest. In this study, we explore how two key elements VR systems — level (amount) spatial pattern live-tree affect carryover post-har...

Journal: :محیط زیست طبیعی 0
مونا اسماعیل پور دانشجوی کارشناسی ارشد محیط زیست، دانشکدۀ منابع طبیعی، دانشگاه تهران، کرج، ایران محمد کابلی گروه محیط زیست، دانشکدۀ منابع طبیعی، دانشگاه تهران، کرج، ایران محمود کرمی گروه محیط زیست، دانشکدۀ منابع طبیعی، دانشگاه تهران، کرج، ایران افشین علیزاده شعبانی گروه محیط زیست، دانشکدۀ منابع طبیعی، دانشگاه تهران، کرج، ایران آزیتا فراشی گروه محیط زیست، دانشکدۀ منابع طبیعی، دانشگاه فردوسی مشهد، مشهد، ایران

increasing patch edges in natural habitats, as a result of habitat fragmentation, are a major threat for wildlife populations, especially avifaunal communities. habitat edges provide different conditions compared to the core area which can directly or indirectly cause changes in species number, population and composition. this fact will demand a dissimilar management strategy. this study was co...

2002
James K. Agee

Fire played an important role in maintaining and creating conditions suitable for native flora and fauna in the forests of western North America. Recent coarse filter conservation strategies have advocated creating future landscapes that incorporate historic or natural ranges of variability, including fire regimes. Historic fire regimes were variable across the West, and created quite unique co...

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