نتایج جستجو برای: multi species forests

تعداد نتایج: 1027675  

2016
Andrew Whitworth Roger Downie Rudolf von May Jaime Villacampa Ross MacLeod

The structure and underlying functions of the majority of the world’s tropical forests have been disrupted by human impacts, but the potential biodiversity and conservation value of regenerating forests is still debated. One review suggests that on average, regenerating tropical forests hold 57% (±2.6%) of primary forest species richness, raising doubt about a viable second chance to conserve b...

2013
Steffen Boch Daniel Prati Dominik Hessenmöller Ernst-Detlef Schulze Markus Fischer

Lichens are a key component of forest biodiversity. However, a comprehensive study analyzing lichen species richness in relation to several management types, extending over different regions and forest stages and including information on site conditions is missing for temperate European forests. In three German regions (Schwäbische Alb, Hainich-Dün, Schorfheide-Chorin), the so-called Biodiversi...

Journal: :international journal of advanced biological and biomedical research 2013
kimia pourmoghadam kamran pourmoghadam esmaiel khosropour maziar haidari

physiological factors have effects on most forest parameters such as forest classification so that understanding knowledge about this subject is important to manage forests. the forests of sorkhake-sanjabi village with area of 1645 ha located in eslam abad city, kermanshah province, iran were selected. 23 sample plots with rectangular shape (40m*50m) were selected and the species, origin of spe...

2002
Paul V. A. Fine PAUL V. A. FINE

Current research efforts to understand the relative invasibility of different plant communities have mostly ignored tropical forests. Only a few studies have treated invasive species in tropical forests, and recent worldwide analyses have not provided clear predictions concerning the relative invasibility of tropical forests. In this review, the extent to which exotic species have invaded tropi...

2015
Claire A. Baldeck Gregory P. Asner Robin E. Martin Christopher B. Anderson David E. Knapp James R. Kellner S. Joseph Wright Lalit Kumar

Remote identification and mapping of canopy tree species can contribute valuable information towards our understanding of ecosystem biodiversity and function over large spatial scales. However, the extreme challenges posed by highly diverse, closed-canopy tropical forests have prevented automated remote species mapping of non-flowering tree crowns in these ecosystems. We set out to identify ind...

Journal: :Ecology letters 2009
Frans Bongers Lourens Poorter William D Hawthorne Douglas Sheil

The intermediate disturbance hypothesis (IDH) predicts local species diversity to be maximal at an intermediate level of disturbance. Developed to explain species maintenance and diversity patterns in species-rich ecosystems such as tropical forests, tests of IDH in tropical forest remain scarce, small-scale and contentious. We use an unprecedented large-scale dataset (2504 one-hectare plots an...

2017
Liyong Fu Ram P. Sharma Guangyu Zhu Haikui Li Lingxia Hong Hong Guo Guangshuang Duan Chenchen Shen Yuancai Lei Yutang Li Xiangdong Lei Shouzheng Tang

Accurate estimates of forest site productivity are essential for environmental planning and forest management. In this study, we developed a new productivity index, hereafter termed basal area potential productivity index (BAPP), to estimate site productivity for irregular and complex forests characterized by multi-aged, multi-species, and multi-layer stands. We presented the biological relevan...

اسماعیل‌زاده, امید, حسین‌زاده, سعیده ,

Floristic composition of boxwood (Buxus hyrcana Pojark) stands in the forests of Western Haraz, distributed at the altitudinal range of 250 to 1,200 m asl, was investigated by field-walk method. Results showed that the flora of this area includes 50 families, 69 genera, and 78 plant species. Rosaceae, Orchidaceae, Dryopteridaceae, Lamiaceae and Aspleniaceae are the greatest families in this are...

Journal: :Conservation biology : the journal of the Society for Conservation Biology 2009
Robin L Chazdon Carlos A Peres Daisy Dent Douglas Sheil Ariel E Lugo David Lamb Nigel E Stork Scott E Miller

In the wake of widespread loss of old-growth forests throughout the tropics, secondary forests will likely play a growing role in the conservation of forest biodiversity. We considered a complex hierarchy of factors that interact in space and time to determine the conservation potential of tropical secondary forests. Beyond the characteristics of local forest patches, spatial and temporal lands...

زبیری, محمود, فقهی , جهانگیر, مروی مهاجر, محمدرضا, نوری, زهرا,

The quantitative description of forest structure can be regarded as one of the most usable working tools in modern forest management.The study aims at analyzing the stand structure in unlogged beech forests using nearest neighbor indices. Data collection was done in compartment 319 with an area about 48 ha in Educational and Experimental Forests of University of Tehran. Species and DBH of all ...

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