نتایج جستجو برای: tropical forests

تعداد نتایج: 102462  

Journal: :journal of ornamental plants 2014
achar devaraja am jakhar mamta jakeer p shetty kpv

in the present study, randomly amplified polymorphic dna (rapd) markers were used to analyze the genetic diversity in 20 varieties of philodendron. the polymerase chain reaction was performed with 60 rapd primers, out of which 21 primers showed clear amplification as well as more polymorphism. in total, 354 scorable rapd loci with 348 polymorphic bands (98%) were observed. percentages of polymo...

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...

2011
Luca M. Luiselli

1. Before Biodiversity Management: A Short Historical Background 2. Forest Habitats and Biodiversity 3. The Rain Forests of Southern Nigeria: A Case Study 4. Managing Well-Known Forest Sites 4.1. Temperate Forests 4.2. Tropical Forests 4.3. People's Dependence on Forest Resources and Institutional Alternatives for Sustainable Management of the Tropical Forests 4.4. Assessing Conservation Priori...

Journal: :Tree physiology 2013
Xuhui Zhou Yuling Fu Lingyan Zhou Bo Li Yiqi Luo

Tropical forests play a crucial role in regulating regional and global climate dynamics, and model projections suggest that rapid climate change may result in forest dieback or savannization. However, these predictions are largely based on results from leaf-level studies. How tropical forests respond and feedback to climate change is largely unknown at the ecosystem level. Several complementary...

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...

2005
David A. King S. Joseph Wright Joseph H. Connell

Maximum height was assessed for tree species from seven temperate deciduous forests, one subtropical forest and one tropical forest and combined with published tree heights for three other tropical forests. The temperate deciduous forests showed a strong concentration of canopy species and a dearth of subcanopy species. In contrast, the four tropical forests showed more uniform distributions of...

Journal: :Revista de biologia tropical 2009
Xiao-Tao Lü Jian-Wei Tang Zhi-Li Feng Mai-He Li

Lianas are important components of tropical forests and have significant impacts on the diversity, structure and dynamics of tropical forests. The present study documented the liana flora in a Chinese tropical region. Species richness, abundance, size-class distribution and spatial patterns of lianas were investigated in three 1-ha plots in tropical seasonal rain forests in Xishuangbanna, SW Ch...

Journal: :Philosophical transactions of the Royal Society of London. Series B, Biological sciences 2004
Simon L Lewis Yadvinder Malhi Oliver L Phillips

Recent observations of widespread changes in mature tropical forests such as increasing tree growth, recruitment and mortality rates and increasing above-ground biomass suggest that 'global change' agents may be causing predictable changes in tropical forests. However, consensus over both the robustness of these changes and the environmental drivers that may be causing them is yet to emerge. Th...

2002
Sean C Thomas Jennifer L Baltzer

To understand where and why tropical forests exist, one must begin with some essential facts of geography and climatic systems. By definition, ‘the tropics’ lie between 238N and 238S latitude, the area within which the sun lies directly overhead at some point in its seasonal progression. Thefluxof solar energywithin this region is high, due to the fact that incoming sunlight is projected at a 9...

2014
Rebecca Ostertag Faith Inman-Narahari Susan Cordell Christian P. Giardina Lawren Sack

The potential influence of diversity on ecosystem structure and function remains a topic of significant debate, especially for tropical forests where diversity can range widely. We used Center for Tropical Forest Science (CTFS) methodology to establish forest dynamics plots in montane wet forest and lowland dry forest on Hawai'i Island. We compared the species diversity, tree density, basal are...

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