نتایج جستجو برای: forest grass cover

تعداد نتایج: 227128  

2004
Noriko Onishi Takuhiko Murakami Nobuya Mizoue

In order to comprehend detailed forest resources, the use of high spatial resolution data is expected. However, the efficeint forest cover type classification method of high spatial resolution data is not cleared yet. So, this study discussed the potential of the forest cover type classification such as classification of coniferous forest, broadleaved forest, and mixed forest, and tree speices ...

Journal: :Conservation biology : the journal of the Society for Conservation Biology 2012
Alexandre Camargo Martensen Milton Cezar Ribeiro Cristina Banks-Leite Paulo Inácio Prado Jean Paul Metzger

Theoretical and empirical studies demonstrate that the total amount of forest and the size and connectivity of fragments have nonlinear effects on species survival. We tested how habitat amount and configuration affect understory bird species richness and abundance. We used mist nets (almost 34,000 net hours) to sample birds in 53 Atlantic Forest fragments in southeastern Brazil. Fragments were...

2017
Delphine Brogna Adrien Michez Sander Jacobs Marc Dufrêne Caroline Vincke Jiangyong Hu

Forested catchments are generally assumed to provide higher quality water. However, this hypothesis must be validated in various contexts as interactions between multiple land use and land cover (LULC) types, ecological variables and water quality variables render this relationship highly complex. This paper applies a straightforward multivariate approach on a typical large monitoring dataset o...

Journal: :The New phytologist 2008
David M Nelson Feng Sheng Hu

Holocene vegetational dynamics along the prairie-forest border of Minnesota were first documented in McAndrews' classic work. Despite numerous subsequent paleo-studies, a number of questions remain unanswered about the vegetation history of the region. Here, pollen, stable-isotope, mineral, and charcoal data are described from three lakes near McAndrews' sites. These data were compared with oth...

1999
NANCY C. JOHNSON DAVID A. WEDIN

Wildfires and alien grass invasion threaten dry tropical forests throughout Central America. Efforts to preserve and restore these forests will require a better understanding of how conversion to grassland changes key belowground processes and organisms such as soil organic matter, nutrient cycling, and mycorrhizae. We studied forest, edge, and grassland soils from five 60-m transects perpendic...

2014
Sadie J. Ryan Michael Palace Joel Hartter Jeremy E. Diem Colin A. Chapman Jane Southworth

Africa's Albertine Rift region faces a juxtaposition of rapid human population growth and protected areas, making it one of the world's most vulnerable biodiversity hotspots. Using satellite-derived estimates of forest cover change, we examined national socioeconomic, demographic, agricultural production, and local demographic and geographic variables, to assess multilevel forces driving local ...

2015
José Carlos Morante-Filho Deborah Faria Eduardo Mariano-Neto Jonathan Rhodes Philip Gibbons

Habitat loss is the dominant threat to biodiversity and ecosystem functioning in terrestrial environments. In this study, we used an a priori classification of bird species based on their dependence on native forest habitats (forest-specialist and habitat generalists) and specific food resources (frugivores and insectivores) to evaluate their responses to forest cover reduction in landscapes in...

Journal: :Environmental entomology 2014
T W Leslie D J Biddinger J R Rohr A G Hulting D A Mortensen S J Fleischer

Northeastern U.S. farms are often situated adjacent to forestland due to the heterogeneous nature of the landscape. We investigated how forested areas influence Carabidae diversity within nearby crop fields by establishing transects of pitfall traps. Trapping extended across a forest-agriculture ecotone consisting of maize, an intermediate mowed grass margin, and a forest edge. Carabidae divers...

2000
D. G. Brown B. C. Pijanowski J. D. Duh

This paper presents an approach to modeling land-cover change as a function of land-use change. We argue that, in order to model the link between socio-economic change and changes in forest cover in a region that is experiencing residential and recreational development and agricultural abandonment, land-use and landcover change need to be represented as separate processes. Forest-cover change i...

2017
Qiong Gao Mei Yu

Impact of changes in land cover and land use on hydrological service of tropical watersheds is one of the focal research tropics in both hydrology and Land Cover Land Use Changes (LCLUC). Land fragmentation is an important feature of LCLUC, however, its impact on hydrological service of tropical watershed is unclear despite a few theoretical frameworks. In this paper, we described a simulation ...

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