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An Insight into Spatial-Temporal Trends of Fire Ignitions and Burned Areas in the European Mediterranean Countries
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作者 Marcos Rodrigues Jesfis San Miguel +2 位作者 Sandra Oliveira Francisco Moreira Andrea Camia 《Journal of Earth Science and Engineering》 2013年第7期497-505,共9页
This paper presents an analysis of the fire trends in southern European countries, where forest fires are a major hazard. Data on number of fires and burned area size from 1985 until 2009 were retrieved from the Europ... This paper presents an analysis of the fire trends in southern European countries, where forest fires are a major hazard. Data on number of fires and burned area size from 1985 until 2009 were retrieved from the European Fire Database in the European Forest Fire Information System and used to study the temporal and spatial variability of fire occurrence at three different spatial scales: the whole European Mediterranean region, country level and province level (NUTS3). The temporal trends were assessed with the Mann-Kendall test and Sen's slope in the period 1985-2009. At regional (supranational) level, our results suggest a significant decreasing trend in the burned area for the whole study period. At country level, the trends vary by country, although there is a general increase in number of fires, mainly in Portugal, and a decrease in bumed areas, as is the case of Spain. A similar behavior was found at NUTS3 level, with an increase of number of fires in the Spanish and Portuguese provinces and a generalized decrease of the burned area in most provinces of the region. These results provide an important insight into the spatial distribution and temporal evolution of fires, a crucial step to investigate the underlying causes and impacts of fire occurrence in this region. 展开更多
关键词 Fire ignition burned area WILDFIRE trend test Mann-Kendall.
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蒙古高原草原火行为的时空格局与影响因子 被引量:24
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作者 曲炤鹏 郑淑霞 白永飞 《应用生态学报》 CAS CSCD 北大核心 2010年第4期807-813,共7页
采用GIS空间分析方法和L3JRC遥感卫星数据,研究了2000—2007年间蒙古高原草原火行为的时空分布规律,比较了中国内蒙古自治区和蒙古人民共和国草原火行为的差异,分析了植被、气候与人文因素等对草原火行为的影响.结果表明:不同植被类型... 采用GIS空间分析方法和L3JRC遥感卫星数据,研究了2000—2007年间蒙古高原草原火行为的时空分布规律,比较了中国内蒙古自治区和蒙古人民共和国草原火行为的差异,分析了植被、气候与人文因素等对草原火行为的影响.结果表明:不同植被类型间的过火率存在极显著差异(P<0.001),为草甸草原>典型草原>荒漠草原,蒙古人民共和国草原过火率显著高于中国内蒙古自治区(P<0.001),过火频次的分布格局与过火迹地相一致.草原火行为存在明显的年际变化特征,草甸草原(r2=-0.54,P<0.05)和典型草原(r2=-0.61,P<0.05)的年过火率与年降雨量呈负相关关系;草原火集中在降水较少、风速较大的春、秋两季.中国内蒙古自治区的人口密度和载畜密度远高于蒙古人民共和国,而过火率则相反,表明人文因素,尤其是过度放牧是导致中国内蒙古自治区和蒙古人民共和国火行为差异的主要原因. 展开更多
关键词 蒙古高原 草原 火行为 过火迹地 过火 过火频次
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