نتایج جستجو برای: forest fire

تعداد نتایج: 143001  

2015
Yundan Xiao Xiongqing Zhang Ping Ji

Forest fires can cause catastrophic damage on natural resources. In the meantime, it can also bring serious economic and social impacts. Meteorological factors play a critical role in establishing conditions favorable for a forest fire. Effective prediction of forest fire occurrences could prevent or minimize losses. This paper uses count data models to analyze fire occurrence data which is lik...

2005

Effective wildfire suppression and diminished use of prescribed burning in forestry has clearly eliminated the role of fire in Finnish forest ecosystems as compared to pristine stands. The reintroduction of fire back to nature has therefore been suggested in various instructions, forest certification and forest conservation programmes. At the same time it is recognized that possible climate cha...

2016
Anabelle W. Cardoso José A. Medina‐Vega Yadvinder Malhi Stephen Adu‐Bredu George K.D. Ametsitsi Gloria Djagbletey Frank van Langevelde Elmar Veenendaal Immaculada Oliveras

UNLABELLED Forest encroachment into savanna is occurring at an unprecedented rate across tropical Africa, leading to a loss of valuable savanna habitat. One of the first stages of forest encroachment is the establishment of tree seedlings at the forest-savanna transition. This study examines the demographic bottleneck in the seedlings of five species of tropical forest pioneer trees in a forest...

2004
N. El-Sheimy

More than forty percent of Canada's land area is covered by forest, of which fifty-six percent is commercially productive. However, this forest resource is constantly at risk of destruction by wild-land fire. Fire annually burns 433,000 hectares of commercial forest, and it enlarges Canada's forest management budget. This paper briefly explains the application requirements and system components...

Journal: :international journal of advanced biological and biomedical research 2013
abas jamshidi bakhtar khosro sagheb-talebi mohamad reza marvi mohajer maziar haidari

fire, as a natural ecological disturbance factor in forest, this study located in the marivan region, northern zagros forest, and western iranian state of kurdistan. in each burned and unburned area 30 circle sample plot (1000 m2) were collected by randomized–systematic method in the 100×200 m net (in total 60 plots). in every sample plot the kind of species, number of tree, the height of coppi...

2004
Shengli Huang Florian Siegert Richard Wagner

Wildfires significantly affect the boreal ecosystem of Siberia. However, records on burnt areas and fire impact are still not satisfactory in Russia. The dense smoke from active burning and the persistent cloud covers impeded the application of optical sensors to the detection of burnt area in Siberia forest during the summer fire season. The high resolution SAR data are of limited use for burn...

2012
L. T. Berner P. S. A. Beck M. M. Loranty H. D. Alexander M. C. Mack S. J. Goetz

Climate change and land-use activities are increasing fire activity across much of the Siberian boreal forest, yet the climate feedbacks from forest disturbances remain difficult to quantify due to limited information on forest biomass distribution, disturbance regimes and post-disturbance ecosystem recovery. Our primary objective here was to analyse post-fire accumulation of Cajander larch (La...

2009
Douglas J. Shinneman Meredith W. Cornett Brian J. Palik

Restoring altered forest landscapes toward their ranges of natural variability (RNV) may enhance ecosystem sustainability and resiliency, but such efforts can be hampered by complex land ownership and management patterns. We evaluated restoration potential for southern-boreal forests in the 2.1 million ha Border Lakes Region of northern Minnesota (U.S.A.) and Ontario (Canada), where spatially d...

Journal: :Philosophical Transactions of the Royal Society B: Biological Sciences 2008
Jos Barlow Carlos A Peres

The only fully coupled land-atmosphere global climate model predicts a widespread dieback of Amazonian forest cover through reduced precipitation. Although these predictions are controversial, the structural and compositional resilience of Amazonian forests may also have been overestimated, as current vegetation models fail to consider the potential role of fire in the degradation of forest eco...

2012
C. S. Eastaugh D. M. Molina

Forest roads and permanent fuelbreaks are an important part of fire suppression infrastructure, but due to maintenance and environmental costs many forest agencies seek to reduce the extent of these networks. The question of which roads should be retained or where fuelbreaks should be established is contentious, and few quantified methods exist to aid management decisions. This study uses GIS p...

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