نتایج جستجو برای: forest structure

تعداد نتایج: 1663160  

2009
Jesse R. Lasky Timothy H. Keitt

Community structure and species’ abundances may be strongly correlated to patterns of forest cover, although such patterns are poorly known for tropical dry-forest birds, especially for those in Panamanian dry forests. Birds were distance-sampled during point counts in five dry-forest fragments in Panama. Distance from point count to forest edge and forest coverage at three spatial scales (500,...

2015
Rodrigo L. L. Orihuela Carlos A. Peres Gabriel Mendes João A. Jarenkow Marcelo Tabarelli Dusan Gomory

We examine the effects of forest fragmentation on the structure and composition of tree assemblages within three seasonal and aseasonal forest types of southern Brazil, including evergreen, Araucaria, and deciduous forests. We sampled three southernmost Atlantic Forest landscapes, including the largest continuous forest protected areas within each forest type. Tree assemblages in each forest ty...

2007

Nacrtak Model development and use play a significant role in research and forest management of Slovenian forests. As co-natural and sustainable forest management is traditional, it is essential to rely on available knowledge of the composition of natural plant associations. This paper describes the need for stumpage price modelling, and the basic concept of developing models which can behave dy...

2013
Ivar Vleut Samuel Israel Levy-Tacher Willem Frederik de Boer Jorge Galindo-González Luis-Bernardo Vazquez

Most studies on frugivorous bat assemblages in secondary forests have concentrated on differences among successional stages, and have disregarded the effect of forest management. Secondary forest management practices alter the vegetation structure and fruit availability, important factors associated with differences in frugivorous bat assemblage structure, and fruit consumption and can therefor...

2009
Sassan S. Saatchi

Today, the scientific community and the space organizations are becoming increasingly interested in the use of UHF radar sensors for global observation of forested ecosystems. This interest has challenged the radio science community to develop innovative and improved approaches to problems associated with the spaceborne UHF propagation and scattering of microwaves in forest applications. In thi...

Journal: :Fire 2021

Climate warming is expected to increase fire frequency in many productive obligate seeder forests, where repeated high-intensity can initiate stand conversion alternative states with contrasting structure. These vegetation–fire interactions may modify the direct effects of climate on microclimatic conditions that control dead fuel moisture content (FMC), which regulates activity these high-prod...

Journal: :محیط شناسی 0
داود کرتولی نژاد سید محسن حسینی سید خلاق میر نیا

the damages due to dwarf mistletoes to the industrial forests encouraged the scientists to evaluate the infection intensity and illustrate the spatial distribution of mistletoes for forest management, wild life and biodiversity conservation. there are two current systems to evaluate infection intensity wich are easier, cheaper, more efficient and authoritative than others in all over the world,...

2013
Keith S. Summerville Michael R. Saunders Jamie L. Lane

—The response of forest insect communities to disturbances such as timber harvest likely will depend on the underlying ecological assembly rules that affect community structure. Two competing hypotheses are niche assembly, which seeks to demonstrate significant species-environment correlations, and dispersal-assembly, which seeks to demonstrate spatial autocorrelation in the absence of species-...

2013
WEN J. WANG HONG S. HE MARTIN A. SPETICH STEPHEN R. SHIFLEY FRANK R. THOMPSON DAVID R. LARSEN JACOB S. FRASER JIAN YANG

Two challenges confronting forest landscape models (FLMs) are how to simulate fine, standscale processes while making large-scale (i.e., .10 ha) simulation possible, and how to take advantage of extensive forest inventory data such as U.S. Forest Inventory and Analysis (FIA) data to initialize and constrain model parameters. We present the LANDIS PRO model that addresses these needs. LANDIS PRO...

2004
Thomas Blaschke Dirk Tiede Marco Heurich

This paper investigates the potential of laser scanning data to model forest 3d structure and its spatial pattern. Most of the existing methods for assessing structures in mountain forests are either inventory methods, which cannot be used for spatial assessments over large areas, or methods aimed only at assessing actual wood production. Several new landscape metrics are developed and applied ...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید