نتایج جستجو برای: land fire

تعداد نتایج: 158578  

2017
Sally Zhen

L and fires in Southeast Asia have increased dramatically over the past 30 years due to changes in land use and population density, draining of swamp forests, etc.. In 2015, Indonesian fires alone are estimated to have emitted as much carbon dioxide as Indias annual fossil fuel usage, and to have caused around 12,000 premature deaths. The massive negative environmental and health impacts have p...

1997
JAN W. VAN WAGTENDONK

Fuel treatments are necessary in many vegetated areas of the Sierra Nevada to mitigate the effects of decades of fire suppression and land-management activities on fuel accumulations and understory canopies. Treating fuels will reduce the severity of wildfires and, as a result, the threat to human lives, the destruction of property and valuable resources, and the alteration of natural fire regi...

Journal: :Journal of environmental quality 2006
X Dai T W Boutton M Hailemichael R J Ansley K E Jessup

Vegetation fires may alter the quantity and quality of organic matter inputs to soil, rates of organic matter decay, and environmental factors that influence those processes. However, few studies have evaluated the impacts of this land management technique on soil organic carbon (SOC) and total N in grasslands and savannas. We evaluated the impact of repeated fires and their season of occurrenc...

2016
Greg R. Guerin Ed Biffin Zdravko Baruch Andrew J. Lowe RunGuo Zang

We aimed to identify regional centres of plant biodiversity in South Australia, a sub-continental land area of 983,482 km2, by mapping a suite of metrics. Broad-brush conservation issues associated with the centres were mapped, specifically climate sensitivity, exposure to habitat fragmentation, introduced species and altered fire regimes. We compiled 727,417 plant species records from plot-bas...

Journal: :جغرافیا و مخاطرات محیطی 0
حسن فرامرزی سید محسن حسینی مهدی غلامعلی فرد

1. introduction extensive fires in the forests are examples of natural crises (hosseinali, 2005) and forest fire events are increasing in the conditions of changing climate and global warming; (azizi and yousefi, 2005). this phenomenon is considered one of the most destructive factors for forest ecosystems, causing irreparable damages (marozas et al, 2007). some of these damages include land us...

Journal: :Ecological applications : a publication of the Ecological Society of America 2013
William T Flatley Charles W Lafon Henri D Grissino-Mayer Lisa B LaForest

Fire-maintained ecosystems and associated species are becoming increasingly rare in the southern Appalachian Mountains because of fire suppression policies implemented in the early 20th century. Restoration of these communities through prescribed fire has been hindered by a lack of information on historical fire regimes. To characterize past fire regimes, we collected and absolutely dated the t...

2015
Philip E. Higuera John T. Abatzoglou Jeremy S. Littell Penelope Morgan Christopher Carcaillet

Time-varying fire-climate relationships may represent an important component of fire-regime variability, relevant for understanding the controls of fire and projecting fire activity under global-change scenarios. We used time-varying statistical models to evaluate if and how fire-climate relationships varied from 1902-2008, in one of the most flammable forested regions of the western U.S.A. Fir...

Journal: :Philosophical transactions of the Royal Society of London. Series B, Biological sciences 2008
Anders Granström Mats Niklasson

Fire, being both a natural and cultural phenomenon, presents problems in disentangling the historical effect of humans from that of climate change. Here, we investigate the potential impact of humans on boreal fire regimes from a perspective of fuels, ignitions and culture. Two ways for a low technology culture to impact the fire regime are as follows: (i) by altering the number of ignitions an...

2006
M. Moriondo P. Good R. Durao M. Bindi C. Giannakopoulos J. Corte-Real

In this study, output of the Hadley Centre Regional Circulation Model (RCM) (HadRM3P, 0.44° × 0.44° resolution) was used as input to the Canadian Forest Fire Weather Index (FWI) for the present and 2 future IPCC climate scenarios (Special Report on Emissions Scenarios [SRES], A2 and B2 scenarios). The aim was to investigate the effects of climate change on fire risk (number of days with fire ri...

2012
Rafael Valley Brian Scott Sheppard

Wildfire can be a catastrophic event in some situations; it could also be beneficial in other situations. This depends on how the land is being used, and what sort of vegetation is present. Because rangelands often have different types of vegetation on them, burning is likely to have some effect on the interrelation between plant types. It is clear that if the vegetation is removed by fire, the...

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