نتایج جستجو برای: forest fire

تعداد نتایج: 143001  

2014
Danny L. Fry Scott L. Stephens Brandon M. Collins Malcolm P. North Ernesto Franco-Vizcaíno Samantha J. Gill

In Mediterranean environments in western North America, historic fire regimes in frequent-fire conifer forests are highly variable both temporally and spatially. This complexity influenced forest structure and spatial patterns, but some of this diversity has been lost due to anthropogenic disruption of ecosystem processes, including fire. Information from reference forest sites can help managem...

2008
Bülent Sağlam Ertuğrul Bilgili Bahar Dinç Durmaz Ali İhsan Kadıoğulları Ömer Küçük

Computing fire danger and fire risk on a spatio-temporal scale is of crucial importance in fire management planning, and in the simulation of fire growth and development across a landscape. However, due to the complex nature of forests, fire risk and danger potential maps are considered one of the most difficult thematic layers to build up. Remote sensing and digital terrain data have been intr...

2014
S.Gugan Vignesh Pradeep Kumar

Since many decades different parts of world's forest environment undergo depletion because of many factors but major depletion is due to random forest fires a state, process, or instance of combustion in which fuel or other material is ignited and combined with oxygen, giving off light, heat and flame. This causes destruction of a building, town, forest etc. In Andhra Pradesh the forest area to...

Journal: :Philosophical Transactions of the Royal Society B: Biological Sciences 2008
Daniel C Nepstad Claudia M Stickler Britaldo Soares- Filho Frank Merry

Some model experiments predict a large-scale substitution of Amazon forest by savannah-like vegetation by the end of the twenty-first century. Expanding global demands for biofuels and grains, positive feedbacks in the Amazon forest fire regime and drought may drive a faster process of forest degradation that could lead to a near-term forest dieback. Rising worldwide demands for biofuel and mea...

2012
Stephan Kambach Fernando Guerra Stephan G. Beck Isabell Hensen Matthias Schleuning

Mountain forest ecosystems in the Andes are threatened by deforestation. Increasing fire frequencies lead to fire-degraded habitats that are often characterized by a persistent fern-dominated vegetation. Little is known about the consequences of these drastic changes in habitat conditions for pollinator communities. In a rapid diversity assessment, we collected individuals of two major groups o...

2009
N. Khabarov E. Moltchanova M. Obersteiner

* Corresponding author. ** This research was performed in the framework of the EC project GEO-BENE (www.geo-bene.eu), led by IIASA. Abstract – In this paper we investigate how improvements in the weather observation systems help to reduce forest fires impact on population by targeting and monitoring places where ripe fires are likely to occur. For the purposes of population impact assessment we...

2006
Norman L. Christensen Jerry F. Franklin

• Explore the variations in forest biodiversity and associated patterns of climate and ge o g ra p hy that influence fire regimes; • Evaluate the influence of past and current management (e.g., fire exclusion) and land use on forest biodiversity; and • Consider the likely impacts of fire management alternatives, including suppression, post-fire remediation, prescribed fire, and mechanical thinn...

2005
Jennifer L. Beverly David L. Martell

Fire frequency is the most commonly used measure to characterize fire regimes for comparisons across geographical areas or time periods. Within the boreal forest region of the Boreal Shield ecozone of Ontario, fire frequency changes over time and across longitudinal gradients have been associated with drought frequency and large-scale climate processes. While providing evidence that fire regime...

2011
M. Lavoie M. C. Mack

In this study we characterized spatial heterogeneity of soil carbon and nitrogen pools, soil moisture, and soil pH of the first 15 cm of the soil profile; depth of the organic horizon; forest floor covers; and understory vegetation abundances in three sites (1999, 1987 and 1920 wildfires) of a boreal forest chronosequence of interior Alaska. We also investigated the cross-dependence between und...

2002
Justin Podur David L. Martell Ferenc Csillag

The spatial pattern of forest fire locations is of interest for fire occurrence prediction and for understanding the role of fire in landscape processes. A spatial statistical analysis of lightning-caused fires in the province of Ontario, between 1976 and 1998, was carried out to investigate the spatial pattern of fires, the way they depart from randomness, and the scales at which spatial corre...

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